CN115928502B - Preparation technology capable of controlling lactic acid side permeation resistance of liquid food packaging base paper - Google Patents
Preparation technology capable of controlling lactic acid side permeation resistance of liquid food packaging base paper Download PDFInfo
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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 60
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 33
- 239000004310 lactic acid Substances 0.000 title claims abstract description 31
- 235000014655 lactic acid Nutrition 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 235000021056 liquid food Nutrition 0.000 title claims abstract description 16
- 238000005516 engineering process Methods 0.000 title description 4
- 238000004513 sizing Methods 0.000 claims abstract description 77
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 60
- 229920002472 Starch Polymers 0.000 claims abstract description 46
- 235000019698 starch Nutrition 0.000 claims abstract description 46
- 239000008107 starch Substances 0.000 claims abstract description 46
- 238000004537 pulping Methods 0.000 claims abstract description 36
- 239000002002 slurry Substances 0.000 claims abstract description 31
- 239000007788 liquid Substances 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 20
- 230000014759 maintenance of location Effects 0.000 claims abstract description 16
- 229920001577 copolymer Polymers 0.000 claims abstract description 13
- 125000002091 cationic group Chemical group 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 238000001035 drying Methods 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 15
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 9
- 238000010025 steaming Methods 0.000 claims description 8
- 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
- 238000013329 compounding Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 abstract description 8
- 238000003490 calendering Methods 0.000 description 14
- 238000012216 screening Methods 0.000 description 14
- 238000001556 precipitation Methods 0.000 description 11
- 235000013336 milk Nutrition 0.000 description 8
- 239000008267 milk Substances 0.000 description 8
- 210000004080 milk Anatomy 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000002156 mixing Methods 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 229920001131 Pulp (paper) Polymers 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 5
- 239000000835 fiber Substances 0.000 description 5
- 239000003292 glue Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000003749 cleanliness Effects 0.000 description 3
- 235000013305 food Nutrition 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 239000011122 softwood Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000004908 Emulsion polymer Substances 0.000 description 2
- 239000011121 hardwood Substances 0.000 description 2
- 230000002209 hydrophobic effect Effects 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
- 238000004026 adhesive bonding Methods 0.000 description 1
- -1 alkyl ketene dimer Chemical compound 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect 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
- 238000005886 esterification reaction Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 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
- 125000000686 lactone group Chemical group 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 230000035764 nutrition Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 235000020185 raw untreated milk Nutrition 0.000 description 1
- 230000001954 sterilising effect Effects 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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Abstract
The invention provides a preparation process capable of controlling lactic acid side permeation resistance of liquid food packaging base paper, which comprises the following steps: s1, pulping; s2, wet end chemistry, comprising the 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, AKD addition amount 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 comprises the steps of carrying out 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 gelatinization liquid and 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 The method comprises the steps of carrying out a first treatment on the surface of the The surface sizing agent is an acrylonitrile-acrylate copolymer with cationic charges. The invention can improve the lactic acid side permeation resistant function 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 side permeation resistance of liquid food packaging base paper, which is used for solving the technical problems of AKD precipitation and paper slip caused by adopting AKD sizing for controlling lactic acid side permeation in the production process of the liquid packaging base paper.
Background
Along with the development of the food industry and the improvement of living water, the food packaging fresh-keeping function and the food safety are more highly required. For example: the quality of milk varieties which are in issue in recent years is closely related to the packaging mode of milk in addition to the different sterilization modes. The cold-stored milk which is accepted by people is packaged by adopting a house-type paper box, and the milk is pasteurized, so that the cold-stored milk is the packaged milk with the best milk nutrition retention.
The requirements of fresh milk for manufacturing the house-shaped paper boxes on the quality of raw milk are highest, the filling aseptic condition and the quality guarantee effect are also best, and accordingly, the requirements of lactic acid resistance of the liquid food packaging base paper for manufacturing the house-shaped paper boxes are also highest, and then the problem of lactic acid side seepage resistance of the roof package is solved.
In the production process of liquid packaging base paper for manufacturing house-type paper boxes, conventionally controlling lactic acid side penetration is mainly to carry out neutral sizing at the wet end of papermaking by adding a large amount of AKD (alkyl ketene dimer), wherein lactone rings (-C-O-C-) in AKD molecular chains are broken under a slightly alkaline condition to carry out 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 a hydrophobic layer so as to enable the hydrophobic layer to meet the lactic acid resistance. The main component in AKD is wax powder, the effective component is a waxy mixture of C16, C18 and the like, the higher the carbon chain length is, the stronger the hydrolysis resistance is, the higher the high temperature resistance is, the higher the addition amount is, the stronger the sizing effect is, but the higher the probability of wax precipitation is, the wax precipitation can reduce the sizing effect, the lactic acid resistance of paper is affected, the running performance of a net part and a squeezing part is also affected, and the slipping phenomenon of paper is also affected, so that the service performance of paper is affected.
Therefore, through continuous exploration and technological innovation, the inventor breaks through changing the sizing technology of the liquid packaging base paper, solves the problems of AKD precipitation and paper slip while improving the lactic acid side permeation resistance, and develops a novel production method for controlling the lactic acid side permeation resistance of the liquid food packaging base paper.
Disclosure of Invention
The invention mainly solves the technical difficulty of lactic acid side penetration resistance of the liquid packaging base paper, solves the problem of slipping of paper caused by AKD precipitation in the sizing process, and solves the problems of AKD precipitation and slipping of paper in the production process of AKD sizing of the liquid packaging base paper by optimizing the sizing process through technological innovation.
In view of the background art, the present invention adopts the following technical scheme:
a preparation process for controlling lactic acid side permeation resistance of liquid food packaging base paper comprises the following steps:
s1, pulping, including pulping of surface paper layers, pulping of core paper layers and pulping of bottom paper layers;
s2, wet end chemistry, comprising the 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, AKD addition amount 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 comprises three layers of slurry respectively filtering, compounding, squeezing and drying the three layers of slurry to form a paper blank, and further comprises surface sizing on the upper surface and the lower surface of the paper blank; wherein the raw material for surface sizing is a mixture of gelatinization liquid and a surface sizing treatment agent, the gelatinization liquid is formed by steaming and gelatinizing starch solution, the mass percentage concentration of dry starch in the starch solution is 6-12%, and the application amount of the dry starch is 2-3g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The surface sizing agent is acrylonitrile-acrylic ester copolymer with cationic charge;
s4, packaging the finished paper.
Wherein the application amount is 2-3g/m 2 The meaning of (2) is: application amount per square meter of paper, bagThe upper and lower surfaces, also called the front and back surfaces, of the paper blank are separately coated with the sum of the amounts.
In the step S3, the mass percentage of the surface sizing treatment 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% NBKP (bleached sulfate softwood pulp) +40-70% LBKP (bleached sulfate hardwood pulp); the pulp ratio of the core paper layer pulping is as follows: 40-60% BCTMP (bleached thermomechanical pulp) +40-60% NBKP (bleached sulfate softwood pulp); the pulp ratio of the bottom paper layer pulping is as follows: 30-70% NBKP (bleached sulfate softwood pulp) +30-70% LBKP (bleached sulfate hardwood pulp).
In the step S2, the high-efficiency cationic wet strength agent is Kymene 777LX, and the addition amount of the high-efficiency cationic wet strength agent 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 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.
In the step S2, after the wet-end 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: surface paper layer-50-0 UEQ/L, core paper layer-50-0 UEQ/L and bottom paper layer-50-0 UEQ/L.
The surface sizing agent is a copolymer of acrylic acid and styrene, a copolymer of butyl acrylate and styrene or an acrylonitrile-acrylate copolymer with cationic charges.
Compared with the prior art, the invention has the beneficial effects that:
the invention eliminates the traditional single-pulp internal AKD glue application, combines the internal AKD glue application with the starch glue application on the surface of the paper blank, reduces the AKD dosage, reduces the lactic acid side permeation degree of paper, and does not influence the lactic acid resistance of the paper.
Meanwhile, because the AKD glue is applied in the pulp only to enable the paper to generate the functions of lactic acid resistance and water resistance, the functions are single, other performances are not affected, therefore, the consumption of AKD in the pulp is reduced, the other performances of the paper are not affected, on the contrary, too high consumption of AKD can affect the cleanliness of a wet end system, the retention of AKD can be negatively affected, the sizing effect of AKD can not be optimized, meanwhile, the excessive AKD can affect the dehydration effect of wood pulp fibers in the forming process, the forming of the paper is poor, the drying is difficult, and the like, so that the invention reduces the consumption of AKD in the pulp and avoids the problems.
In a word, the base paper prepared by the method has good lactic acid side penetration resistance, low AKD consumption, 16-21kg per ton paper unit consumption, 2-3 kg per ton paper unit consumption of the surface sizing agent, low per ton paper sizing cost, and difficult slip of paper, and compared with the liquid food packaging base paper produced by adopting the traditional AKD sizing technology, the liquid food packaging base paper has poor lactic acid resistance, high AKD consumption, 30-40kg per ton paper unit consumption, high per ton paper sizing cost, serious AKD precipitation, easy slip of paper and remarkable advantages.
Detailed Description
Comparative example (plain liquid packaging base paper):
1. pulping process
And (3) a surface paper layer: the pulp board is crushed by a hydropulper according to a certain proportion, then is screened, pulped, mixed with pulp, and finally is fed and manufactured by a paper feeder, wherein the proportion of the pulp of the surface paper layer is 50 percent NBKP+50 percent LBKP;
core paper layer: pulp boards are subjected to screening, pulping and pulp mixing after being crushed by a hydropulper according to a certain proportion, and finally, a paper feeder is used for papermaking, and the pulp proportion of a core paper layer is as follows: 50% BCTMP+50% NBKP;
and (3) a bottom paper layer: pulp boards are subjected to screening, pulping and pulp preparation after being crushed by a hydropulper according to a certain proportion, and finally, a paper machine is used for papermaking, and the pulp proportion of the bottom paper layer is as follows: 50% NBKP+50% LBKP.
2. Wet end chemistry
AKD addition: 35kg/t of surface, 35kg/t of core and 35kg/t of bottom, and the total amount of AKD actually applied is 35kg/t;
wet strength agent addition: 10kg/t of surface, 20kg/t of core and 10kg/t of bottom
Retention aid addition: 0.6kg/t of face, 1.2kg/t of core and 0.6kg/t of bottom
pH value: face 7.4, core 7.3, bottom 7.3;
charge: face-60 UEQ/L, core-70 UEQ/L, bottom-65 UEQ/L
3. Paper machine section
(1) Vehicle speed: 410 m/min;
(2) making three layers of nets, filtering three layers of sizing agents respectively, and compositing the three layers of sizing agents;
(3) press pressure: the first pressure is 160kN/m, the second pressure is 680kN/m, and the third pressure is 30kN/m.
(4) And (3) drying: front drying has a first section of steam pressure of 340kPa, a second section of steam pressure of 270kPa, and a third section of steam pressure of 80kPa
(5) Surface sizing: starch concentration 10%, front application 1g/m 2 Reverse application amount 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 calendaring: the pressure is 40KN/m and the temperature is 180 DEG C
(8) Coiling, rewinding, packaging and warehousing.
The quality index of the finished paper is as follows:
embodiment one:
a preparation process for controlling lactic acid side permeation resistance of liquid food packaging base paper comprises the following steps:
1. pulping process
And (3) a surface paper layer: the pulp board is crushed by a hydropulper according to a certain proportion, then is screened, pulped, mixed with pulp, and finally is fed and manufactured by a paper feeder, wherein the proportion of the pulp of the surface paper layer is 50 percent NBKP+50 percent LBKP;
core paper layer: pulp boards are subjected to screening, pulping and pulp mixing after being crushed by a hydropulper according to a certain proportion, and finally, a paper feeder is used for papermaking, and the pulp proportion of a core paper layer is as follows: 50% BCTMP+50% NBKP;
and (3) a bottom paper layer: pulp boards are subjected to screening, pulping and pulp preparation after being crushed by a hydropulper according to a certain proportion, and finally, a paper machine is used for papermaking, and the pulp proportion of the bottom paper layer is as follows: 50% NBKP+50% LBKP.
2. Wet end chemistry
AKD addition: 15kg/t of surface, 25kg/t of core and 15kg/t of bottom, wherein the total amount of actually applied AKD 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: 10kg/t of surface, 20kg/t of core and 10kg/t of bottom
Retention aid addition: 0.6kg/t of face, 1.2kg/t of core and 0.6kg/t of bottom
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 layers of nets, filtering three layers of sizing agents respectively, and compositing the three layers of sizing agents;
(3) press pressure: the first pressure is 160kN/m, the second pressure is 680kN/m, and the third pressure is 30kN/m.
(4) And (3) drying: front drying has a first section of steam pressure of 340kPa, a second section of steam pressure of 270kPa, and a third section of steam pressure of 80kPa
(5) Surface sizing: the raw materials adopt a mixture of gelatinizing liquid and a surface sizing treatment agent, wherein the gelatinizing liquid is formed by steaming and gelatinizing starch solution, the mass percentage concentration of dry starch in the starch solution is 10%, and the front application amount of the dry starch is 1.4g/m 2 The reverse application amount was 1.4g/m 2 The mass percentage of the surface sizing treatment agent relative to the dry starch is 25%;
(6) hard calendering: the pressure is 20KN/m, the temperature is 180 DEG C
(7) Soft calendaring: the pressure is 40KN/m and the temperature is 180 DEG C
(8) Coiling, rewinding, packaging and warehousing.
The surface sizing agent is a copolymer of acrylic acid and styrene, and has the main functions of assisting paper sizing, reducing the chemical AKD consumption of a wet end under the condition of guaranteeing the anti-lactic acid performance of paper, reducing AKD precipitation and solving the problem of paper slipping.
The quality index of the finished paper is as follows:
embodiment two:
a preparation process for controlling lactic acid side permeation resistance of liquid food packaging base paper comprises the following steps:
1. pulping process
And (3) a surface paper layer: the pulp board is crushed by a hydropulper according to a certain proportion, then is screened, pulped, mixed with pulp, and finally is fed and manufactured by a paper feeder, wherein the proportion of the pulp of the surface paper layer is 50 percent NBKP+50 percent LBKP;
core paper layer: pulp boards are subjected to screening, pulping and pulp mixing after being crushed by a hydropulper according to a certain proportion, and finally, a paper feeder is used for papermaking, and the pulp proportion of a core paper layer is as follows: 50% BCTMP+50% NBKP;
and (3) a bottom paper layer: pulp boards are subjected to screening, pulping and pulp preparation after being crushed by a hydropulper according to a certain proportion, and finally, a paper machine is used for papermaking, and the pulp proportion of the bottom paper layer is as follows: 50% NBKP+50% LBKP.
2. Wet end chemistry
AKD addition: 13kg/t of surface, 24kg/t of core and 13kg/t of bottom, wherein the total amount of actually applied AKD 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: 10kg/t of surface, 20kg/t of core and 10kg/t of bottom
Retention aid addition: 0.6kg/t of face, 1.2kg/t of core and 0.6kg/t of bottom
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 layers of nets, filtering three layers of sizing agents respectively, and compositing the three layers of sizing agents;
(3) press pressure: the first pressure is 160kN/m, the second pressure is 680kN/m, and the third pressure is 30kN/m.
(4) And (3) drying: front drying has a first section of steam pressure of 340kPa, a second section of steam pressure of 270kPa, and a third section of steam pressure of 80kPa
(5) Surface sizing: the raw materials adopt a mixture of gelatinizing liquid and a surface sizing treatment agent, wherein the gelatinizing liquid is formed by steaming and gelatinizing starch solution, the mass percentage concentration of dry starch in the starch solution is 10%, and the front application amount of the dry starch is 1.4g/m 2 The reverse application amount was 1.4g/m 2 The mass percentage of the surface sizing treatment agent relative to the dry starch is 25%;
(6) hard calendering: the pressure is 20KN/m, the temperature is 180 DEG C
(7) Soft calendaring: the pressure is 40KN/m and the temperature is 180 DEG C
(8) Coiling, rewinding, packaging and warehousing.
The surface sizing agent is a copolymer of butyl acrylate and styrene, and the usage and the function are the same as those of the first embodiment.
The quality index of the finished paper is as follows:
embodiment III:
a preparation process for controlling lactic acid side permeation resistance of liquid food packaging base paper comprises the following steps:
1. pulping process
And (3) a surface paper layer: the pulp board is crushed by a hydropulper according to a certain proportion, then is screened, pulped, mixed with pulp, and finally is fed and manufactured by a paper feeder, wherein the proportion of the pulp of the surface paper layer is 50 percent NBKP+50 percent LBKP;
core paper layer: pulp boards are subjected to screening, pulping and pulp mixing after being crushed by a hydropulper according to a certain proportion, and finally, a paper feeder is used for papermaking, and the pulp proportion of a core paper layer is as follows: 50% BCTMP+50% NBKP;
and (3) a bottom paper layer: pulp boards are subjected to screening, pulping and pulp preparation after being crushed by a hydropulper according to a certain proportion, and finally, a paper machine is used for papermaking, and the pulp proportion of the bottom paper layer is as follows: 50% NBKP+50% LBKP.
2. Wet end chemistry
AKD addition: 12kg/t of surface, 22kg/t of core and 12kg/t of bottom, wherein the total amount of AKD actually applied 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;
wet strength agent addition: 10kg/t of surface, 20kg/t of core and 10kg/t of bottom
Retention aid addition: 0.6kg/t of face, 1.2kg/t of core and 0.6kg/t of bottom
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 layers of nets, filtering three layers of sizing agents respectively, and compositing the three layers of sizing agents;
(3) press pressure: the first pressure is 160kN/m, the second pressure is 680kN/m, and the third pressure is 30kN/m.
(4) And (3) drying: front drying has a first section of steam pressure of 340kPa, a second section of steam pressure of 270kPa, and a third section of steam pressure of 80kPa
(5) Surface sizing: the raw materials adopt a mixture of gelatinizing liquid and a surface sizing treatment agent, wherein the gelatinizing liquid is formed by steaming and gelatinizing starch solution, the mass percentage concentration of dry starch in the starch solution is 10%, and the front application amount of the dry starch is 1.4g/m 2 The reverse application amount was 1.4g/m 2 The mass percentage of the surface sizing treatment agent relative to the dry starch is 25%;
(6) hard calendering: the pressure is 20KN/m, the temperature is 180 DEG C
(7) Soft calendaring: the pressure is 40KN/m and the temperature is 180 DEG C
(8) Coiling, rewinding, packaging and warehousing.
The surface sizing agent is an acrylonitrile-acrylate copolymer and its use and function are the same as in example one.
The quality index of the finished paper is as follows:
embodiment four:
a preparation process for controlling lactic acid side permeation resistance of liquid food packaging base paper comprises the following steps:
1. pulping process
And (3) a surface paper layer: the pulp board is crushed by a hydropulper according to a certain proportion, then is screened, pulped, mixed with pulp, and finally is fed and manufactured by a paper feeder, wherein the proportion of the pulp of the surface paper layer is 50 percent NBKP+50 percent LBKP;
core paper layer: pulp boards are subjected to screening, pulping and pulp mixing after being crushed by a hydropulper according to a certain proportion, and finally, a paper feeder is used for papermaking, and the pulp proportion of a core paper layer is as follows: 50% BCTMP+50% NBKP;
and (3) a bottom paper layer: pulp boards are subjected to screening, pulping and pulp preparation after being crushed by a hydropulper according to a certain proportion, and finally, a paper machine is used for papermaking, and the pulp proportion of the bottom paper layer is as follows: 50% NBKP+50% LBKP.
2. Wet end chemistry
AKD addition: 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: 10kg/t of surface, 20kg/t of core and 10kg/t of bottom
Retention aid addition: 0.6kg/t of face, 1.2kg/t of core and 0.6kg/t of bottom
pH value: face 7.9, core 8.0, bottom 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 layers of nets, filtering three layers of sizing agents respectively, and compositing the three layers of sizing agents;
(3) press pressure: the first pressure is 160kN/m, the second pressure is 680kN/m, and the third pressure is 30kN/m.
(4) And (3) drying: front drying has a first section of steam pressure of 340kPa, a second section of steam pressure of 270kPa, and a third section of steam pressure of 80kPa
(5) Surface sizing: the raw materials adopt a mixture of gelatinizing liquid and a surface sizing treatment agent, wherein the gelatinizing liquid is formed by steaming and gelatinizing starch solution, the mass percentage concentration of dry starch in the starch solution is 10%, and the front application amount of the dry starch is 1.5g/m 2 The reverse application amount was 1.5g/m 2 The mass percentage of the surface sizing treatment agent relative to the dry starch is 30%;
(6) hard calendering: the pressure is 20KN/m, the temperature is 180 DEG C
(7) Soft calendaring: the pressure is 40KN/m and the temperature is 180 DEG C
(8) Coiling, rewinding, packaging and warehousing.
The materials, the usage and the functions of the surface sizing agent are the same as those of the embodiment.
The quality index of the finished paper is as follows:
fifth embodiment:
1. pulping process
And (3) a surface paper layer: the pulp board is crushed by a hydropulper according to a certain proportion, then is screened, pulped, mixed with pulp, and finally is fed and manufactured by a paper feeder, wherein the proportion of the pulp of the surface paper layer is 50 percent NBKP+50 percent LBKP;
core paper layer: pulp boards are subjected to screening, pulping and pulp mixing after being crushed by a hydropulper according to a certain proportion, and finally, a paper feeder is used for papermaking, and the pulp proportion of a core paper layer is as follows: 50% BCTMP+50% NBKP;
and (3) a bottom paper layer: pulp boards are subjected to screening, pulping and pulp preparation after being crushed by a hydropulper according to a certain proportion, and finally, a paper machine is used for papermaking, and the pulp proportion of the bottom paper layer is as follows: 50% NBKP+50% LBKP.
2. Wet end chemistry
AKD addition: 15kg/t of surface, 25kg/t of core and 15kg/t of bottom, wherein the total amount of actually applied AKD 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: 10kg/t of surface, 20kg/t of core and 10kg/t of bottom
Retention aid addition: 0.6kg/t of face, 1.2kg/t of core and 0.6kg/t of bottom
pH value: face 8.0, core 8.1, bottom 7.9;
charge: face-30 UEQ/L, core-25 UEQ/L, bottom-20 UEQ/L
3. Paper machine section
(1) Vehicle speed: 410 m/min;
(2) making three layers of nets, filtering three layers of sizing agents respectively, and compositing the three layers of sizing agents;
(3) press pressure: the first pressure is 160kN/m, the second pressure is 680kN/m, and the third pressure is 30kN/m;
(4) and (3) drying: front drying has a first section of steam pressure of 340kPa, a second section of steam pressure of 270kPa, and a third section of steam pressure of 80kPa
(5) Surface sizing: the raw materials adopt a mixture of gelatinizing liquid and a surface sizing treatment agent, wherein the gelatinizing liquid is formed by steaming and gelatinizing starch solution, the mass percentage concentration of dry starch in the starch solution is 10%, and the front application amount of the dry starch is 1.3g/m 2 The reverse application amount was 1.3g/m 2 The mass percentage of the surface sizing treatment agent relative to the dry starch is 20%;
(6) hard calendering: the pressure is 20KN/m, the temperature is 180 DEG C
(7) Soft calendaring: the pressure is 40KN/m and the temperature is 180 DEG C
(8) Coiling, rewinding, packaging and warehousing.
The materials, the usage and the functions of the surface sizing agent are the same as those of the embodiment.
The quality index of the finished paper is as follows:
example six:
a preparation process for controlling lactic acid side permeation resistance of liquid food packaging base paper comprises the following steps:
1. pulping process
And (3) a surface paper layer: the pulp board is crushed by a hydropulper according to a certain proportion, then is screened, pulped, mixed with pulp, and finally is fed and manufactured by a paper feeder, wherein the proportion of the pulp of the surface paper layer is 50 percent NBKP+50 percent LBKP;
core paper layer: pulp boards are subjected to screening, pulping and pulp mixing after being crushed by a hydropulper according to a certain proportion, and finally, a paper feeder is used for papermaking, and the pulp proportion of a core paper layer is as follows: 50% BCTMP+50% NBKP;
and (3) a bottom paper layer: pulp boards are subjected to screening, pulping and pulp preparation after being crushed by a hydropulper according to a certain proportion, and finally, a paper machine is used for papermaking, and the pulp proportion of the bottom paper layer is as follows: 50% NBKP+50% LBKP.
2. Wet end chemistry
AKD addition: the total amount of AKD actually applied is 20kg/t according to the mass ratio of the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry, namely 14kg/t of surface, 24kg/t of core and 14kg/t of bottom;
wet strength agent addition: 10kg/t of surface, 20kg/t of core and 10kg/t of bottom
Retention aid addition: 0.6kg/t of face, 1.2kg/t of core and 0.6kg/t of bottom
pH value: face 7.2, core 7.3, bottom 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 layers of nets, filtering three layers of sizing agents respectively, and compositing the three layers of sizing agents;
(3) press pressure: the first pressure is 160kN/m, the second pressure is 680kN/m, and the third pressure is 30kN/m.
(4) And (3) drying: front drying has a first section of steam pressure of 340kPa, a second section of steam pressure of 270kPa, and a third section of steam pressure of 80kPa
(5) Surface sizing: the raw materials adopt a mixture of gelatinizing liquid and a surface sizing treatment agent, wherein the gelatinizing liquid is formed by steaming and gelatinizing starch solution, the mass percentage concentration of dry starch in the starch solution is 10%, and the front application amount of the dry starch is 1.4g/m 2 The reverse application amount was 1.4g/m 2 The mass percentage of the surface sizing treatment agent relative to the dry starch is 25%;
(6) hard calendering: the pressure is 20KN/m, the temperature is 180 DEG C
(7) Soft calendaring: the pressure is 40KN/m and the temperature is 180 DEG C
(8) Coiling, rewinding, packaging and warehousing.
The surface sizing agent is an acrylonitrile-acrylate copolymer and its use and function are the same as in example one.
The quality index of the finished paper is as follows:
according to the method, the problem of precipitation of AKD is reduced when the requirement of lactic acid resistance is met, the problems of precipitation of AKD and slipping of paper are solved by adjusting the wet-end chemical process, the AKD adding process and the surface sizing process, and the lactic acid resistance and side seepage performance of the paper are improved.
The wet-end system can help to improve the reactivity of AKD, the reactivity of AKD is strongest between pH values of 7.5-8.5, the normal wet-end system is neutral, the pH value of the wet-end system is improved by adding a trace amount of liquid sodium hydroxide when wood pulp is thrown, the optimal pH value range is achieved, 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 and adhere to on the paper to charge control, strengthen the glueing effect of AKD, and the electric charge is one index of control wet-end system cleanliness factor, because papermaking's characteristics, the chemistry that adds at the wet-end system can not all remain on the paper, along with the operation of system, remaining chemicals can accumulate in the system, leads to the negative charge material of system to progressively increase, AKD has positive electric charge, wood pulp fiber has negative charge, and negative charge material is too much, can hinder AKD to adhere to on wood pulp fiber for AKD's reservation descends. There are two general methods of controlling the charge, one is to minimize the addition of additional chemicals and the other is to add fresh water to increase the cleanliness of the system, but the disadvantage is to increase the water consumption.
The sizing adopts the process of adding surface sizing treatment into the internal AKD sizing, and the surface sizing treatment agent permeates into the surface paper layer, the bottom paper layer and part of the core paper layer through the surface sizing, so that the lactic acid resistance of the surface paper layer and the bottom paper layer is mainly enhanced, the integral lactic acid side permeation resistance of the paper is better, the AKD consumption is greatly reduced, the AKD precipitation of a net part and a press part is reduced, and the problem of paper slipping is solved.
The present invention is not limited to the above-mentioned embodiments, and any equivalent embodiments which can be changed or modified by the technical content disclosed above can be applied to other fields, but any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical substance of the present invention without departing from the technical content of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (4)
1. The preparation process capable of controlling lactic acid side permeation resistance of the liquid food packaging base paper is characterized by comprising the following steps of:
s1, pulping, including pulping of surface paper layers, pulping of core paper layers and pulping of bottom paper layers;
s2, wet end chemistry, comprising the 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, AKD addition amount 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 comprises three layers of slurry respectively filtering, compounding, squeezing and drying the three layers of slurry to form a paper blank, and further comprises 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 gelatinization liquid and a surface sizing treatment agent, wherein the gelatinization liquid is formed by steaming and gelatinizing a starch solution, the mass percentage concentration of dry starch in the starch solution is 6-12%, and the application amount of the surface sizing agent is 2-3g/m according to the dry starch 2 The method comprises the steps of carrying out a first treatment on the surface of the The surface sizing agent is acrylonitrile-acrylic ester copolymer with cationic charge;
s4, packaging paper;
in the step 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% NBKP+40-70% LBKP; the pulp ratio of the core paper layer pulping is as follows: 40-60% of BCTMP+40-60% of NBKP; the pulp ratio of the bottom paper layer pulping is as follows: 30-70% of NBKP+30-70% of LBKP;
in the step S2, further includes: the pH value of each layer is adjusted as follows: 7.5-8.5 parts of surface paper layer, 7.5-8.5 parts of core paper layer and 7.5-8.5 parts of bottom paper layer.
2. The preparation process according to claim 1, wherein in S2, the efficient cationic wet strength agent is Kymene 777LX, and the addition amount thereof 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.
3. The process according to claim 1, wherein in S2, after the wet-end chemical process, the charge of each layer is: surface paper layer-50-0 UEQ/L, core paper layer-50-0 UEQ/L and bottom paper layer-50-0 UEQ/L.
4. The process according to claim 1, wherein the surface sizing agent is a copolymer of acrylic acid and styrene, a copolymer of butyl acrylate and styrene or an acrylonitrile-acrylate copolymer having a cationic charge.
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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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