CN115928502A - Preparation process capable of controlling lactic acid side leakage resistance of liquid food packaging base paper - Google Patents
Preparation process capable of controlling lactic acid side leakage resistance of liquid food packaging base paper Download PDFInfo
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- CN115928502A CN115928502A CN202211692134.5A CN202211692134A CN115928502A CN 115928502 A CN115928502 A CN 115928502A CN 202211692134 A CN202211692134 A CN 202211692134A CN 115928502 A CN115928502 A CN 115928502A
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- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 35
- 239000004310 lactic acid Substances 0.000 title claims abstract description 31
- 235000014655 lactic acid Nutrition 0.000 title claims abstract description 31
- 235000021056 liquid food Nutrition 0.000 title claims abstract description 16
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 238000004513 sizing Methods 0.000 claims abstract description 56
- 239000002002 slurry Substances 0.000 claims abstract description 48
- 229920002472 Starch Polymers 0.000 claims abstract description 47
- 235000019698 starch Nutrition 0.000 claims abstract description 47
- 239000008107 starch Substances 0.000 claims abstract description 47
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 44
- 238000004537 pulping Methods 0.000 claims abstract description 36
- 230000014759 maintenance of location Effects 0.000 claims abstract description 16
- 229920001577 copolymer Polymers 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 125000002091 cationic group Chemical group 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 23
- 238000004519 manufacturing process Methods 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 12
- 238000013329 compounding Methods 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 9
- 238000010411 cooking Methods 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 7
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims description 3
- 238000001311 chemical methods and process Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 abstract description 15
- 239000002994 raw material Substances 0.000 abstract description 8
- 239000000123 paper Substances 0.000 description 187
- 238000003490 calendering Methods 0.000 description 14
- 238000002156 mixing Methods 0.000 description 14
- 238000012216 screening Methods 0.000 description 14
- 238000001556 precipitation Methods 0.000 description 9
- 235000013336 milk Nutrition 0.000 description 8
- 239000008267 milk Substances 0.000 description 8
- 210000004080 milk Anatomy 0.000 description 8
- 238000004026 adhesive bonding Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 229920001131 Pulp (paper) Polymers 0.000 description 5
- 239000000835 fiber Substances 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 4
- 239000003292 glue Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000003749 cleanliness Effects 0.000 description 3
- 235000013305 food Nutrition 0.000 description 3
- 239000011122 softwood Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000004908 Emulsion polymer Substances 0.000 description 2
- -1 alkyl ketene dimer Chemical compound 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000011121 hardwood Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 125000001165 hydrophobic group Chemical group 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002655 kraft paper Substances 0.000 description 1
- 125000000686 lactone group Chemical group 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 230000035764 nutrition Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
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- Paper (AREA)
Abstract
The invention providesThe preparation process for controlling the lactic acid side leakage resistance of the liquid food packaging base paper comprises the following steps: s1, pulping; s2, wet end chemistry, which comprises the following steps of respectively applying to surface paper layer slurry, core paper layer slurry and bottom paper layer slurry: AKD, high-efficiency cationic wet strength agent and retention aid; wherein the addition amount of AKD is as follows: 10-15 kg/t of surface paper layer, 20-25 kg/t of core paper layer and 10-15 kg/t of bottom paper layer; s3, a paper machine section, which comprises the steps of performing surface sizing on the upper surface and the lower surface of a paper blank; wherein the raw material for surface sizing is a mixture of a pasting liquid and a surface sizing treatment agent, the mass concentration of dry starch in the starch solution is 6-12%, and the application amount is 2-3g/m 2 (ii) a The surface sizing agent is acrylonitrile-acrylate copolymer with cationic charge. The invention can improve the lactic acid seepage resistance of the liquid food packaging base paper.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to a preparation process capable of controlling lactic acid seepage resistance of liquid food packaging base paper, which is used for solving the technical problems of AKD precipitation and paper slip caused by AKD sizing for controlling lactic acid seepage in the production process of the liquid packaging base paper.
Background
With the development of food industry and the improvement of living water of people, higher requirements are put forward on food packaging and fresh-keeping functions and food safety. For example: the quality of the milk variety which is controversial in recent years is closely related to the packaging mode of the milk besides the disinfection mode. The well-known refrigerated milk is packaged by a house-shaped paper box, and the milk is pasteurized, so that the packaged milk with the best milk nutrition retention is provided.
Because the requirements of fresh milk for manufacturing the house-type carton on the quality of the original milk are highest, the filling aseptic condition and the quality guarantee effect are also best, and the filling aseptic condition and the quality guarantee effect are also best, the requirement on the lactic acid resistance of the liquid food packaging base paper for manufacturing the house-type carton is correspondingly highest, and the problem of lactic acid leakage resistance of the roof bag is solved accordingly.
In the production process of liquid packaging base paper for manufacturing house-type paper boxes, the conventional control of lactic acid side permeation resistance is mainly to add a large amount of AKD (alkyl ketene dimer) to carry out neutral sizing at a paper-making wet part, lactone rings (-C-O-C-) in AKD molecular chains are broken under a slightly alkaline condition and subjected to esterification reaction with hydroxyl (-OH) on fibers, and hydrophobic groups (R-CH 2-) on the other side of AKD are arranged on the surfaces of the fibers to form hydrophobic layers so as to meet the lactic acid resistance. The main component in AKD is wax powder, the effective component is the mixture of wax such as C16, C18, the carbon chain length is higher, its hydrolytic resistance is stronger, it is high temperature resistant, the addition is bigger, its glueing effect is stronger, but the probability that wax matter appeared thereupon also is higher, the precipitation of wax matter can reduce glueing effect, influence the anti lactic acid performance of paper, also can influence the running property of net part and press portion, the phenomenon of skidding appears in the paper to influence the performance of paper.
Therefore, through continuous exploration and technological innovation, the inventor breakthroughs the sizing process of the liquid packaging base paper, improves the lactic acid seepage resistance of the liquid packaging base paper, solves the problems of AKD precipitation and paper slipping, and develops a novel production method for controlling the lactic acid seepage resistance of the liquid food packaging base paper.
Disclosure of Invention
The invention mainly solves the technical difficulty of resisting lactic acid side seepage of liquid packaging base paper, simultaneously solves the problem of paper slipping caused by AKD precipitation in the gluing process, and solves the problems of AKD precipitation and paper slipping in the AKD gluing production process of the liquid packaging base paper through technological innovation and optimization of the gluing process.
In view of the background art, the invention adopts the following technical scheme:
a preparation process capable of controlling lactic acid edge leakage resistance of liquid food packaging base paper comprises the following steps:
s1, pulping, including surface paper layer pulping, core paper layer pulping and bottom paper layer pulping;
s2, wet end chemistry, which comprises the following steps of respectively applying to surface paper layer slurry, core paper layer slurry and bottom paper layer slurry: AKD, high-efficiency cation wet strength agent and retention aid; wherein the addition amount of AKD is as follows: 10-15 kg/t of surface paper layer, 20-25 kg/t of core paper layer and 10-15 kg/t of bottom paper layer;
s3, a paper machine working section, which comprises the steps of respectively filtering water of three layers of slurry, compounding the three layers of slurry, pressing and drying to form a paper blank, and further comprises the steps of performing surface sizing on the upper surface and the lower surface of the paper blank; wherein the surface sizing raw material is a mixture of a pasting solution and a surface sizing treatment agent, the pasting solution is formed by cooking and pasting a starch solution, the mass percentage concentration of dry starch in the starch solution is 6-12%, and the application amount is 2-3g/m in terms of dry starch 2 (ii) a The surface sizing agent is an acrylonitrile-acrylate copolymer with cationic charge;
and S4, packaging in paper.
Wherein the application amount is 2 to 3g/m 2 The meaning of (A) is: the amounts of application used per square meter of paper include the sum of the amounts of application of the top and bottom surfaces, also called the front and back surfaces, respectively, of the blank.
In the S3, the mass percentage of the surface sizing agent relative to the dry starch in the starch solution is 20-30%.
In the S1, the pulp ratio of the surface paper layer pulping is 30-60% of NBKP (bleached sulfate softwood pulp) + 40-70% of LBKP (bleached sulfate hardwood pulp); the pulp of the core paper layer is prepared by the following steps: 40-60% by weight of BCTMP (bleached thermomechanical pulp) + 40-60% by weight of NBKP (bleached kraft softwood pulp); the slurry mixture ratio for pulping the bottom paper layer is as follows: 30-70% of NBKP (bleached sulfate softwood pulp) + 30-70% of LBKP (bleached sulfate hardwood pulp).
In the S2, the high-efficiency cationic wet strength agent is Kymene777LX, and the addition amount is as follows: 10-20 kg/t of surface paper layer, 10-20 kg/t of core paper layer and 10-20 kg/t of bottom paper layer; the retention aid is a mixture of SP4715 (anionic emulsion polymer) and PC9912 (cationic emulsion polymer), and the addition amount is as follows: 0.6-1.2 kg/t of surface paper layer, 0.6-1.2 kg/t of core paper layer and 0.6-1.2 kg/t of bottom paper layer.
In S2, after the wet part chemical process, the PH value of each layer is as follows: 7.5 to 8.5 portions of surface paper layer, 7.5 to 8.5 portions of core paper layer and 7.5 to 8.5 portions of bottom paper layer; the charge is: 50-0 UEQ/L surface paper layer, 50-0 UEQ/L core paper layer and 50-0 UEQ/L bottom paper layer.
The surface sizing agent is a copolymer of acrylic acid and styrene with cationic charges, a copolymer of butyl acrylate and styrene or an acrylonitrile-acrylate copolymer.
Compared with the prior art, the invention has the beneficial effects that:
the invention abandons the traditional single pulp inside AKD glue, combines the pulp inside AKD glue and the paper blank surface starch glue, reduces the AKD dosage, reduces the lactic acid edge penetration degree of the paper, and does not influence the lactic acid resistance of the paper.
Meanwhile, the AKD glue applied in the pulp only enables the paper to generate the functions of lactic acid resistance and water resistance, the function is single, and other performances are not influenced, so the consumption of the AKD in the pulp is reduced, and other performances of the paper are not influenced, on the contrary, the excessive consumption of the AKD can influence the cleanliness of a wet part system, and can cause negative influence on the retention of the AKD, but the gluing effect of the AKD cannot be optimized, and meanwhile, the excessive AKD can influence the dehydration effect of wood pulp fibers in the forming process, so the forming of the paper is poor, the paper is more difficult to dry, and the like.
In a word, the base paper prepared by the method has good lactic acid seepage resistance, the dosage of AKD is low, the unit consumption per ton of paper is 16-21kg, the unit consumption per ton of paper of the surface sizing agent is 2-3 kg, the sizing cost per ton of paper is low, the paper is not easy to slip, and compared with the liquid food packaging base paper produced by the traditional AKD sizing process, the liquid food packaging base paper has poor lactic acid resistance, the dosage of AKD is high, the unit consumption per ton of paper is 30-40kg, the sizing cost per ton of paper is high, AKD is seriously separated out, the paper is easy to slip, and the method has remarkable advantages.
Detailed Description
Comparative example (common liquid packaging base paper):
1. pulping process
A surface paper layer: after the pulp board is pulped by a hydrapulper according to a certain proportion, screening, pulping, pulp blending and paper making by a paper feeder are carried out, and the proportion of the pulp of the surface paper layer is 50 percent NBKP +50 percent LBKP;
a core paper layer: after the pulp board is pulped by a hydrapulper according to a certain proportion, screening, pulping, pulp blending and paper feeding machine manufacturing are carried out, and the pulp proportion of the core paper layer is as follows: 50% of BCTMP +50% of NBKP;
a base paper layer: the pulp board is screened, pulped and blended after being pulped by a hydrapulper according to a certain proportion, and finally a paper machine is used for papermaking, wherein the pulp proportion of the base paper layer is as follows: 50% of NBKP +50% of LBKP.
2. Wet end chemistry
Addition amount of AKD: 35kg/t of face, 35kg/t of core and 35kg/t of bottom, and the total amount of AKD actually applied is 35kg/t;
wet strength agent addition amount: 10kg/t face, 20kg/t core, 10kg/t base
Adding amount of retention aid: 0.6kg/t of face, 1.2kg/t of core and 0.6kg/t of base
pH value: face 7.4, core 7.3, base 7.3;
charge: face-60 UEQ/L, core-70 UEQ/L, base-65 UEQ/L
3. Paper machine section
(1) Vehicle speed: 410 m/min;
(2) manufacturing three layers of nets by papermaking, respectively filtering water from the three layers of slurry, and then compounding the three layers of slurry;
(3) pressing pressure: the first pressure is 160kN/m, the second pressure is 680kN/m, and the third pressure is 30kN/m.
(4) And (3) drying: the first-stage steam pressure of the front drying is 340kPa, the second-stage steam pressure is 270kPa, and the third-stage steam pressure is 80kPa
(5) Surface sizing: starch concentration 10%, front application amount 1g/m 2 Reverse side application 1g/m 2 No surface sizing agent is added;
(6) hard calendering: the pressure is 20KN/m, the temperature is 180 DEG C
(7) Soft calendering: the pressure is 40KN/m, and the temperature is 180 DEG C
(8) And (6) reeling, rewinding, packaging and warehousing.
The quality index of finished paper is as follows:
the first embodiment is as follows:
a preparation process capable of controlling lactic acid side leakage resistance of liquid food packaging base paper comprises the following steps:
1. pulping process
A surface paper layer: pulping the pulp board by a hydrapulper according to a certain proportion, screening, pulping, mixing pulp, and finally manufacturing by a paper feeder, wherein the proportion of the pulp of the surface paper layer is 50% NBKP +50% LBKP;
core paper layer: after the pulp board is pulped by a hydrapulper according to a certain proportion, screening, pulping, pulp blending and paper feeding machine manufacturing are carried out, and the pulp proportion of the core paper layer is as follows: 50% of BCTMP +50% of NBKP;
a base paper layer: the pulp board is screened, pulped and prepared after being pulped by a hydrapulper according to a certain proportion, and finally a paper machine is used for papermaking, and the pulp proportion of the base paper layer is as follows: 50% of NBKP +50% of LBKP.
2. Wet end chemistry
Addition amount of AKD: the surface is 15kg/t, the core is 25kg/t, and the bottom is 15kg/t', and the total amount of AKD actually applied is 21kg/t according to the mass ratio of the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry;
wet strength agent addition amount: 10kg/t of face, 20kg/t of core and 10kg/t of base
The addition amount of the retention aid: 0.6kg/t of face, 1.2kg/t of core and 0.6kg/t of base
pH value: face 8.0, core 8.0, bottom 8.0;
charge: face-25 UEQ/L, core-25 UEQ/L, bottom-25 UEQ/L
3. Paper machine section
(1) Vehicle speed: 410 m/min;
(2) manufacturing three layers of nets by papermaking, respectively filtering water from the three layers of slurry, and then compounding the three layers of slurry;
(3) squeezing pressure: the first pressure is 160kN/m, the second pressure is 680kN/m, and the third pressure is 30kN/m.
(4) And (3) drying: the first-stage steam pressure of the front drying is 340kPa, the second-stage steam pressure is 270kPa, and the third-stage steam pressure is 80kPa
(5) Surface sizing: the raw material adopts a mixture of a pasting liquid and a surface sizing treatment agent, wherein the pasting liquid is a starch solutionThe starch paste is formed after the liquid is cooked and gelatinized, the mass percentage concentration of dry starch in the starch solution is 10 percent, and the front surface application amount of the dry starch is 1.4g/m 2 The reverse side application amount was 1.4g/m 2 The mass percentage of the surface sizing agent relative to the dry starch is 25 percent;
(6) hard calendering: the pressure is 20KN/m, the temperature is 180 DEG C
(7) Soft calendering: the pressure is 40KN/m, and the temperature is 180 DEG C
(8) And (6) reeling, rewinding, packaging and warehousing.
The surface sizing agent is a copolymer of acrylic acid and styrene, and is mainly used for assisting paper sizing, so that the consumption of wet-end chemical AKD is reduced, AKD precipitation is reduced and the problem of paper slip is solved under the condition of ensuring the lactic acid resistance of paper.
The quality index of finished paper is as follows:
the second embodiment:
a preparation process capable of controlling lactic acid side leakage resistance of liquid food packaging base paper comprises the following steps:
1. pulping process
A surface paper layer: after the pulp board is pulped by a hydrapulper according to a certain proportion, screening, pulping, pulp blending and paper making by a paper feeder are carried out, and the proportion of the pulp of the surface paper layer is 50 percent NBKP +50 percent LBKP;
core paper layer: after the pulp board is pulped by a hydrapulper according to a certain proportion, screening, pulping, pulp blending and paper feeding machine manufacturing are carried out, and the pulp proportion of the core paper layer is as follows: 50% of BCTMP +50% of NBKP;
a base paper layer: the pulp board is screened, pulped and prepared after being pulped by a hydrapulper according to a certain proportion, and finally a paper machine is used for papermaking, and the pulp proportion of the base paper layer is as follows: 50% NBKP +50% LBKP.
2. Wet end chemistry
Addition amount of AKD: 13kg/t of surface, 24kg/t of core and 13kg/t of bottom, wherein the total amount of AKD actually applied is 19.5kg/t according to the mass ratio of the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry;
wet strength agent addition amount: 10kg/t face, 20kg/t core, 10kg/t base
The addition amount of the retention aid: 0.6kg/t face, 1.2kg/t core, 0.6kg/t base
pH value: face 8.0, core 8.0, bottom 8.0;
charge: face-25 UEQ/L, core-25 UEQ/L, bottom-25 UEQ/L
3. Paper machine section
(1) Vehicle speed: 410 m/min;
(2) making three-layer net, filtering water in three layers of slurry respectively, and compounding the three layers of slurry;
(3) pressing pressure: the first pressure is 160kN/m, the second pressure is 680kN/m, and the third pressure is 30kN/m.
(4) And (3) drying: the first-stage steam pressure of the front drying is 340kPa, the second-stage steam pressure is 270kPa, and the third-stage steam pressure is 80kPa
(5) Surface sizing: the raw material adopts a mixture of a pasting solution and a surface sizing treatment agent, the pasting solution is formed by cooking and pasting a starch solution, the mass percentage concentration of dry starch in the starch solution is 10%, and the front surface application amount of the dry starch is 1.4g/m 2 The reverse side application amount was 1.4g/m 2 The mass percentage of the surface sizing agent relative to the dry starch is 25 percent;
(6) hard calendering: the pressure is 20KN/m, the temperature is 180 DEG C
(7) Soft calendering: the pressure is 40KN/m, and the temperature is 180 DEG C
(8) And (6) reeling, rewinding, packaging and warehousing.
The surface sizing agent is a copolymer of butyl acrylate and styrene, and the use and the function of the surface sizing agent are the same as those of the first embodiment.
The quality index of finished paper is as follows:
example three:
a preparation process capable of controlling lactic acid side leakage resistance of liquid food packaging base paper comprises the following steps:
1. pulping process
A surface paper layer: after the pulp board is pulped by a hydrapulper according to a certain proportion, screening, pulping, pulp blending and paper making by a paper feeder are carried out, and the proportion of the pulp of the surface paper layer is 50 percent NBKP +50 percent LBKP;
core paper layer: after the pulp board is pulped by a hydrapulper according to a certain proportion, screening, pulping, pulp blending, and finally paper feeding machine is used for manufacturing, wherein the pulp proportion of the core paper layer is as follows: 50% of BCTMP +50% of NBKP;
a base paper layer: the pulp board is screened, pulped and prepared after being pulped by a hydrapulper according to a certain proportion, and finally a paper machine is used for papermaking, and the pulp proportion of the base paper layer is as follows: 50% of NBKP +50% of LBKP.
2. Wet end chemistry
Addition amount of AKD: the total amount of AKD applied actually is 18.5kg/t according to the mass ratio of the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry, wherein the surface is 12kg/t, the core is 22kg/t and the bottom is 12 kg/t;
wet strength agent addition amount: 10kg/t of face, 20kg/t of core and 10kg/t of base
Adding amount of retention aid: 0.6kg/t of face, 1.2kg/t of core and 0.6kg/t of base
pH value: face 8.0, core 8.0, bottom 8.0;
charge: face-25 UEQ/L, core-25 UEQ/L, bottom-25 UEQ/L
3. Paper machine section
(1) Vehicle speed: 410 m/min;
(2) making three-layer net, filtering water in three layers of slurry respectively, and compounding the three layers of slurry;
(3) squeezing pressure: the first pressure is 160kN/m, the second pressure is 680kN/m, and the third pressure is 30kN/m.
(4) And (3) drying: the first-stage steam pressure of the front drying is 340kPa, the second-stage steam pressure is 270kPa, and the third-stage steam pressure is 80kPa
(5) Surface sizing: the raw material adopts a mixture of a pasting solution and a surface sizing treatment agent, the pasting solution is formed by cooking and pasting a starch solution, the mass percentage concentration of dry starch in the starch solution is 10%, and the front surface application amount of the dry starch is 1.4g/m 2 The reverse side application amount was 1.4g/m 2 The mass percentage of the surface sizing agent relative to the dry starch is 25%;
(6) hard calendering: the pressure is 20KN/m, the temperature is 180 DEG C
(7) Soft calendering: the pressure is 40KN/m, and the temperature is 180 DEG C
(8) And (5) reeling, rewinding, packaging and warehousing.
The surface sizing agent is an acrylonitrile-acrylate copolymer, and the use and the function of the acrylonitrile-acrylate copolymer are the same as those in the first embodiment.
The quality index of finished paper is as follows:
example four:
a preparation process capable of controlling lactic acid side leakage resistance of liquid food packaging base paper comprises the following steps:
1. pulping process
A surface paper layer: after the pulp board is pulped by a hydrapulper according to a certain proportion, screening, pulping, pulp blending and paper making by a paper feeder are carried out, and the proportion of the pulp of the surface paper layer is 50 percent NBKP +50 percent LBKP;
core paper layer: after the pulp board is pulped by a hydrapulper according to a certain proportion, screening, pulping, pulp blending and paper feeding machine manufacturing are carried out, and the pulp proportion of the core paper layer is as follows: 50% of BCTMP +50% of NBKP;
a base paper layer: the pulp board is screened, pulped and prepared after being pulped by a hydrapulper according to a certain proportion, and finally a paper machine is used for papermaking, and the pulp proportion of the base paper layer is as follows: 50% of NBKP +50% of LBKP.
2. Wet end chemistry
Addition amount of AKD: 10kg/t of surface, 20kg/t of core and 10kg/t of bottom, wherein the total amount of AKD actually applied is 16kg/t according to the mass ratio of the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry;
wet strength agent addition amount: 10kg/t of face, 20kg/t of core and 10kg/t of base
The addition amount of the retention aid: 0.6kg/t face, 1.2kg/t core, 0.6kg/t base
pH value: face 7.9, core 8.0, base 8.1;
charge: face-20 UEQ/L, core-30 UEQ/L, bottom-25 UEQ/L
3. Paper machine section
(1) Vehicle speed: 410 m/min;
(2) making three-layer net, filtering water in three layers of slurry respectively, and compounding the three layers of slurry;
(3) pressing pressure: the first pressure is 160kN/m, the second pressure is 680kN/m, and the third pressure is 30kN/m.
(4) And (3) drying: the first-stage steam pressure of the front drying is 340kPa, the second-stage steam pressure is 270kPa, and the third-stage steam pressure is 80kPa
(5) Surface sizing: the raw material adopts a mixture of a pasting solution and a surface sizing treatment agent, the pasting solution is formed by cooking and pasting a starch solution, the mass percentage concentration of dry starch in the starch solution is 10%, and the front surface application amount of the dry starch is 1.5g/m 2 The reverse side application amount was 1.5g/m 2 The mass percentage of the surface sizing agent relative to the dry starch is 30 percent;
(6) hard calendering: the pressure is 20KN/m, and the temperature is 180 DEG C
(7) Soft calendering: the pressure is 40KN/m, and the temperature is 180 DEG C
(8) And (6) reeling, rewinding, packaging and warehousing.
The materials, the use method and the function of the surface sizing agent are the same as those of the embodiment.
The quality index of finished paper is as follows:
example five:
1. pulping process
A surface paper layer: after the pulp board is pulped by a hydrapulper according to a certain proportion, screening, pulping, pulp blending and paper making by a paper feeder are carried out, and the proportion of the pulp of the surface paper layer is 50 percent NBKP +50 percent LBKP;
core paper layer: after the pulp board is pulped by a hydrapulper according to a certain proportion, screening, pulping, pulp blending and paper feeding machine manufacturing are carried out, and the pulp proportion of the core paper layer is as follows: 50% of BCTMP +50% of NBKP;
a base paper layer: the pulp board is screened, pulped and prepared after being pulped by a hydrapulper according to a certain proportion, and finally a paper machine is used for papermaking, and the pulp proportion of the base paper layer is as follows: 50% NBKP +50% LBKP.
2. Wet end chemistry
Addition amount of AKD: the thickness of the surface is 15kg/t, the core is 25kg/t, the bottom is 15kg/t, and the total amount of AKD actually applied is 21kg/t according to the mass ratio of the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry;
wet strength agent addition amount: 10kg/t of face, 20kg/t of core and 10kg/t of base
The addition amount of the retention aid: 0.6kg/t of face, 1.2kg/t of core and 0.6kg/t of base
pH value: face 8.0, core 8.1, bottom 7.9;
charge: face-30 UEQ/L, core-25 UEQ/L, sole-20 UEQ/L
3. Paper machine section
(1) Vehicle speed: 410 m/min;
(2) manufacturing three layers of nets by papermaking, respectively filtering water from the three layers of slurry, and then compounding the three layers of slurry;
(3) squeezing pressure: the first pressure is 160kN/m, the second pressure is 680kN/m, and the third pressure is 30kN/m;
(4) and (3) drying: the first-stage steam pressure of the front drying is 340kPa, the second-stage steam pressure is 270kPa, and the third-stage steam pressure is 80kPa
(5) Surface sizing: the raw material adopts a mixture of a pasting solution and a surface sizing treatment agent, the pasting solution is formed by cooking and pasting a starch solution, the mass percentage concentration of dry starch in the starch solution is 10%, and the front surface application amount of the dry starch is 1.3g/m 2 The reverse side application amount was 1.3g/m 2 The mass percentage of the surface sizing agent relative to the dry starch is 20 percent;
(6) hard calendering: the pressure is 20KN/m, the temperature is 180 DEG C
(7) Soft calendering: the pressure is 40KN/m, and the temperature is 180 DEG C
(8) And (5) reeling, rewinding, packaging and warehousing.
The materials, the use method and the function of the surface sizing agent are the same as those of the embodiment.
The quality index of finished paper is as follows:
example six:
a preparation process capable of controlling lactic acid side leakage resistance of liquid food packaging base paper comprises the following steps:
1. pulping process
A surface paper layer: pulping the pulp board by a hydrapulper according to a certain proportion, screening, pulping, mixing pulp, and finally manufacturing by a paper feeder, wherein the proportion of the pulp of the surface paper layer is 50% NBKP +50% LBKP;
core paper layer: after the pulp board is pulped by a hydrapulper according to a certain proportion, screening, pulping, pulp blending and paper feeding machine manufacturing are carried out, and the pulp proportion of the core paper layer is as follows: 50% of BCTMP +50% of NBKP;
a base paper layer: the pulp board is screened, pulped and prepared after being pulped by a hydrapulper according to a certain proportion, and finally a paper machine is used for papermaking, and the pulp proportion of the base paper layer is as follows: 50% of NBKP +50% of LBKP.
2. Wet end chemistry
Addition amount of AKD: the weight ratio of the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry is 14kg/t, and the total amount of AKD actually applied is 20kg/t;
wet strength agent addition amount: 10kg/t of face, 20kg/t of core and 10kg/t of base
The addition amount of the retention aid: 0.6kg/t of face, 1.2kg/t of core and 0.6kg/t of base
pH value: face 7.2, core 7.3, base 7.2;
charge: face-74 UEQ/L, core-80 UEQ/L, bottom-76 UEQ/L
3. Paper machine section
(1) Vehicle speed: 410 m/min;
(2) making three-layer net, filtering water in three layers of slurry respectively, and compounding the three layers of slurry;
(3) pressing pressure: the first pressure is 160kN/m, the second pressure is 680kN/m, and the third pressure is 30kN/m.
(4) And (3) drying: the first-stage steam pressure of the front drying is 340kPa, the second-stage steam pressure is 270kPa, and the third-stage steam pressure is 80kPa
(5) Surface sizing: the raw material adopts a mixture of a pasting solution and a surface sizing treatment agent, the pasting solution is formed by cooking and pasting a starch solution, the mass percentage concentration of dry starch in the starch solution is 10%, and the front surface application amount of the dry starch is 1.4g/m 2 The reverse side application amount was 1.4g/m 2 The mass percentage of the surface sizing agent relative to the dry starch is 25 percent;
(6) hard calendering: the pressure is 20KN/m, the temperature is 180 DEG C
(7) Soft calendering: the pressure is 40KN/m, and the temperature is 180 DEG C
(8) And (5) reeling, rewinding, packaging and warehousing.
The surface sizing agent is an acrylonitrile-acrylate copolymer, and the use and the function of the acrylonitrile-acrylate copolymer are the same as those in the first embodiment.
The quality index of finished paper is as follows:
the method has the advantages that the problem of AKD precipitation is reduced when the requirement of lactic acid resistance is met for the liquid packaging base paper, the problems of AKD precipitation and paper slipping are solved by adjusting a wet part chemical process, an AKD adding process and a surface sizing process, and the lactic acid resistance and the edge leakage resistance of the paper are improved.
The wet part system can help to improve the reactivity of AKD (alkyl ketene dimer) by controlling the pH value, the reactivity of AKD is strongest between the pH value of 7.5-8.5, the normal wet part system is neutral, the pH value is between 7.0-7.5, the pH value of the wet part system can be improved by adding a small amount of liquid sodium hydroxide when wood pulp is put into use, the optimal pH value range is reached, and the pH value is controlled by adjusting the addition amount of the liquid sodium hydroxide.
The wet end system can help to improve AKD attachment on paper to the control of electric charge, strengthen AKD's glueing effect, electric charge is an index of monitoring wet end system cleanliness factor, because the characteristics of papermaking, the chemistry that adds at the wet end system can not all remain on the paper, along with the operation of system, remaining chemical can accumulate in the system, lead to the negative charge material of system to progressively increase, AKD has positive charge, wood pulp fiber has the negative charge, and the negative charge material is too much, can hinder AKD attachment on wood pulp fiber, make AKD's retention decline. There are two general methods for controlling charge, one is to minimize the addition of extra chemicals and the other is to add clean water to improve the cleanliness of the system, but the disadvantage is to increase water consumption.
The sizing adopts the technology of AKD sizing and surface sizing treatment in the thick liquid, and the surface sizing agent permeates into the surface paper layer, the bottom paper layer and partial core paper layer through the surface sizing, and mainly enhances the lactic acid resistance of the surface paper layer and the bottom paper layer, so that the whole lactic acid resistance of the paper is better while seepage is realized, the AKD precipitation of a net part and a pressing part is reduced while the AKD using amount is greatly reduced, and the problem of paper slipping is solved.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes by using the technical contents disclosed in the above description, but all simple modifications, equivalent changes and changes made to the above embodiments according to the technical essence of the present invention will still fall within the protection scope of the technical solution of the present invention.
Claims (7)
1. A preparation process capable of controlling lactic acid side leakage resistance of liquid food packaging base paper is characterized by comprising the following steps:
s1, pulping, including surface paper layer pulping, core paper layer pulping and base paper layer pulping;
s2, wet end chemistry, which comprises the following steps of respectively applying to surface paper layer slurry, core paper layer slurry and bottom paper layer slurry: AKD, high-efficiency cationic wet strength agent and retention aid; wherein the addition amount of AKD is as follows: 10-15 kg/t of surface paper layer, 20-25 kg/t of core paper layer and 10-15 kg/t of bottom paper layer;
s3, a paper machine working section, which comprises the steps of respectively filtering water of three layers of slurry, compounding the three layers of slurry, pressing and drying to form a paper blank, and further comprises the steps of performing surface sizing on the upper surface and the lower surface of the paper blank; the surface sizing agent is prepared from a mixture of a pasting solution and a surface sizing treatment agent, the pasting solution is formed by cooking and pasting a starch solution, the mass percent concentration of dry starch in the starch solution is 6-12%, and the application amount of the dry starch is 2-3g/m 2 (ii) a The surface sizing agent is an acrylonitrile-acrylate copolymer with cationic charge;
and S4, packaging in paper.
2. The process according to claim 1, wherein in S3, the surface sizing agent is 20 to 30% by mass relative to the dry starch in the starch solution.
3. The process of claim 1, wherein in S1, the slurry ratio for pulping the surface paper layer is 30-60% by weight NBKP + 40-70% LBKP; the pulp of the core paper layer is prepared by the following steps: NBKP at 40-60% of the total weight of BCTMP + 40-60%; the slurry mixture ratio for pulping the bottom paper layer is as follows: 30-70% of NBKP + 30-70% of LBKP.
4. The preparation process according to claim 1, wherein in the step S2, the high-efficiency cationic wet strength agent is Kymene777LX, and the addition amount is as follows: 10-20 kg/t of surface paper layer, 10-20 kg/t of core paper layer and 10-20 kg/t of bottom paper layer; the retention aid is a mixture of SP4715 and PC9912, and the addition amount of the retention aid is as follows: 0.6-1.2 kg/t of surface paper layer, 0.6-1.2 kg/t of core paper layer and 0.6-1.2 kg/t of bottom paper layer.
5. The manufacturing process according to claim 1, wherein in S2, further comprising: the pH of each layer was adjusted to: 7.5 to 8.5 portions of surface paper layer, 7.5 to 8.5 portions of core paper layer and 7.5 to 8.5 portions of bottom paper layer.
6. The process of claim 1, wherein in S2, after the wet-end chemical process, the charges of each layer are: 50-0 UEQ/L surface paper layer, 50-0 UEQ/L core paper layer and 50-0 UEQ/L bottom paper layer.
7. The process of claim 1, wherein the surface size treatment is a cationically charged copolymer of acrylic acid and styrene, a copolymer of butyl acrylate and styrene, or an acrylonitrile-acrylate copolymer.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101148847A (en) * | 2006-09-19 | 2008-03-26 | 珠海经济特区红塔仁恒纸业有限公司 | Liquid and food packing paper and method for producing the same |
| CN102517999A (en) * | 2011-12-30 | 2012-06-27 | 珠海经济特区红塔仁恒纸业有限公司 | Double-sizing preparation process for liquid packaging white cardboard |
| CN110685187A (en) * | 2019-09-10 | 2020-01-14 | 佛山市顺德区文达创盈包装材料科技有限公司 | Internal sizing composition for paper pulp and application method and application thereof |
| CN111118962A (en) * | 2019-12-31 | 2020-05-08 | 山东江河纸业有限责任公司 | Liquid packaging paper for cold chain and production process thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101148847A (en) * | 2006-09-19 | 2008-03-26 | 珠海经济特区红塔仁恒纸业有限公司 | Liquid and food packing paper and method for producing the same |
| CN102517999A (en) * | 2011-12-30 | 2012-06-27 | 珠海经济特区红塔仁恒纸业有限公司 | Double-sizing preparation process for liquid packaging white cardboard |
| CN110685187A (en) * | 2019-09-10 | 2020-01-14 | 佛山市顺德区文达创盈包装材料科技有限公司 | Internal sizing composition for paper pulp and application method and application thereof |
| CN111118962A (en) * | 2019-12-31 | 2020-05-08 | 山东江河纸业有限责任公司 | Liquid packaging paper for cold chain and production process thereof |
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