CN106368030B - The method that hemp's woody-core total chlorine free bleaching slurry prepares food wrapper - Google Patents

The method that hemp's woody-core total chlorine free bleaching slurry prepares food wrapper Download PDF

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CN106368030B
CN106368030B CN201610830542.0A CN201610830542A CN106368030B CN 106368030 B CN106368030 B CN 106368030B CN 201610830542 A CN201610830542 A CN 201610830542A CN 106368030 B CN106368030 B CN 106368030B
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paper pulp
pulp
slurry
bleaching
paper
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CN106368030A (en
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何洁
陈克利
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Kunming University of Science and Technology
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Kunming University of Science and Technology
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/10—Packing paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
    • D21C3/022—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes in presence of S-containing compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
    • D21C3/026—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes in presence of O2, e.g. air
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1042—Use of chelating agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/16—Bleaching ; Apparatus therefor with per compounds
    • D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/16—Bleaching ; Apparatus therefor with per compounds
    • D21C9/166—Bleaching ; Apparatus therefor with per compounds with peracids
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
    • D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
    • D21H15/10—Composite fibres

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)

Abstract

The invention discloses a kind of methods that hemp's woody-core total chlorine free bleaching starches production food wrapper, chemical pulp is prepared as raw material using hemp's woody-core, TCF bleaching is carried out again and prepares bleached pulp, finally carries out matching to copy with fraction long fibre market pulp board preparing food wrapper；Meet professional standard (QBT 1014-2010) using Food Packaging Paper made from hemp's woody-core TCF bleached pulp by the method for the invention.

Description

The method that hemp's woody-core total chlorine free bleaching slurry prepares food wrapper
Technical field
The invention belongs to non-wood raw materials to prepare food wrapper technical field, in particular to a kind of hemp's woody-core is completely without chlorine (TCF) method that bleached pulp prepares Food Packaging Paper.
Background technique
With the fast development of food processing industry, used packaging also increasingly increases, and food packaging directly connects with food Touching, package materials selection it is appropriate whether, be directly related to the health of people.And in terms of development trend, paper wrapper Dosage will be increasing, expand paper grade (stock) raw material resources cultivar origin seem extremely important.Fiber is with hemp hemp skin The primary raw material of papermaking, textile industry, and it is the clout for belonging to papermaking, textile industry raw material that hemp, which removes core-skin stalk then,.Hemp is tough From the point of view of skin zone is with regard to chemical analysis and fibre morphology, the high-quality high-grade that can manufacture paper with pulp out paper and speciality paper are reasonable, and it is also With certain antibacterial and antibacterial ability, and its core stalk is since its fiber is short and small, and the shortcomings that contain certain amount heteroproteose cell, as Paper making raw material develops by certain restriction, but clout carried out by it is developed and is still of great significance.And paper pulp makes The requirement of environmental protection instantly and the further guarantee of food wrapper safety are not only with completely without chlorine (TCF) bleaching.Its It is entirely free of elemental chlorine in the drift agent of paper pulp bleaching, agent containing oxygen bleaching is used completely, has been inherently eliminated the harm of organochlorine.But It is that often viscosity decline is more for currently used TCF bleaching, and loss of strength is larger.
Summary of the invention
It is an object of that present invention to provide a kind of method that hemp's woody-core prepares food wrapper completely without chlorine (TCF) bleached pulp, Food Packaging Paper standard (QBT 1014-2010) is reached using Food Packaging Paper made from this method.
The present invention is prepared in Food Packaging Paper method, be using hemp's woody-core as raw material, after conventional chemical methods slurrying, Using oxygen delignification's bleaching technology (O), chelation treatment technology (Q), Peracetic acid bleaching technology (Pa) and two sections of hydrogen peroxide The OQPaPP multistage bleaching technique of bleaching technology (PP) composition carries out bleaching to chemical pulp and bleached pulp is made；Bleached pulp Match after material washing with commercially available long fibre TCF bleached pulp and copy, and add auxiliary agent, ordinary food packet is made using small-sized fourdrinier paper machine Fill paper.
The method that hemp's woody-core TCF bleached pulp of the present invention prepares Food Packaging Paper is carried out according to step in detail below, Percentage is mass percent in text, and the dosage of each section of reagent is with the paper pulp over dry matter before oxygen delignification in bleaching process Amount is calculated, and the dosage of each section of reagent is calculated with paper pulp absolute dry mass after bleaching in paper-making process:
(1) after carrying out conventional chemistry slurrying as raw material using hemp's woody-core, at hemp's woody-core chemical pulp oxygen delignification Reason: being to add the NaOH of paper pulp absolute dry mass 2.0-3.0%, paper pulp absolute dry mass 1-3% in 8%-12% paper pulp in pulp density Bleaching assistant Na2SiO3With the cellulose protective agent MgSO of paper pulp absolute dry mass 0.4-0.8%4, it is after mixing evenly 100 in temperature DEG C, oxygen pressure be 0.4-0.6MPa under the conditions of handle 60min, slurry is washed with clear water to pH=6.5 ~ 7.5 after processing；
(2) chelation treatment: slurry pH value is adjusted after oxygen delignification to 3.0-7.0 with sulfuric acid or hydrochloric acid, and dense in paper pulp Degree is the diethylene triamine pentacetic acid (DTPA) (DTPA) or ethylenediamine tetrem that paper pulp absolute dry mass 0.3-0.8% is added in the paper pulp of 6-12% Sour (EDTA), handles 30-60min at 70-90 DEG C of temperature after mixing evenly；
(3) treated, and slurry is washed with distilled water to pH=6.5 ~ 7.5 to step (2)；
(4) step (3) is washed into rear slurry and carries out Peracetic acid bleaching；
(5) step (4) processed slurry is washed with distilled water to pH=6.5 ~ 7.5；
(6) step (5) is washed into rear slurry and carries out hydrogen peroxide two-stage bleaching, used and steam later with two sections between two sections Distilled water is washed to pH=6.5 ~ 7.5 to get paper pulp after bleaching；
(7) paper pulp after step (6) bleaching is matched with commercially available long fibre TCF bleached pulp and is copied, and add auxiliary agent, use small-sized length Food Packaging Paper is made in net paper machine.
According to the requirement of whiteness needed for finally copied Food Packaging Paper and strength character, step (4), step (6) Bleaching condition is adjustable, and the copy paper condition of step (7) is adjustable.Above-mentioned steps (4) Peracetic acid bleach paragraph (Pa) Process conditions are as follows: slurry initial pH value 3-7 after being washed with NaOH regulating step (2)；In the paper pulp that pulp density is 8%-12% Add the stabilizer sodium pyrophosphate of the Peracetic acid of paper pulp absolute dry mass 0.05-0.15% and the CH of 0.6-1.2%3COOOH(is with work Property oxygen AO metering), bleach 60-120min at 60-80 DEG C of temperature after mixing evenly.
Above-mentioned steps (6) hydrogen peroxide bleaching section (P) process conditions are as follows: after being washed with NaOH regulating step (3) at the beginning of slurry Beginning pH value adds the H of paper pulp absolute dry mass 1.5-2.0% to 10.5-11.5 in the paper pulp that slurry concentration is 8-12%2O2, 1-3% Bleaching assistant Na2SiO3With the cellulose protective agent MgSO of 0.2-0.8%4, 120- is bleached at 70-90 DEG C of temperature after mixing evenly 180min is washed with distilled water to pH=6.5-7.5 after first segment drift；After washing again with NaOH adjust paper pulp initial pH value to 10.5-11.5 adds the H of paper pulp absolute dry mass 1.0-1.5% in the paper pulp that slurry concentration is 8-12%2O2, 1-3% bleaching assistant Na2SiO3With the cellulose protective agent MgSO of 0.2-0.8%4, 120-180min is bleached at 70-90 DEG C of temperature after mixing evenly.
Paper pulp and commercial goods long fibre TCF bleached pulp match the work for copying Food Packaging Paper after above-mentioned steps (7) bleaching Skill condition are as follows: paper pulp after step (6) bleaching and commodity long fibre TCF bleached pulp are distinguished into defibrination to 50-70oSR, identical Under the premise of beating degree long fibre TCF bleached pulp by 15-30%(relative to total oven dry stock quality, that is, paper pulp and long fibre after bleaching The absolute dry mass of TCF bleached pulp total amount) carry out proportion mixing；Slurry is broken up after mixing, making to starch dense is 2g/L, sequentially adds paper Starch the cationic starch of absolute dry mass 1.0-2.0%, alkyl ketene dimer (AKD), the paper pulp of paper pulp absolute dry mass 0.2-0.3% The cationic polyacrylamide (CPAM) of absolute dry mass 0.02-0.04%, paper pulp absolute dry mass 0.2-0.6% chitosan, paper pulp are exhausted Dry mass 0.02-0.05% grease-proof and waterproof agent；Every kind of medicament and slurry mixing time 5-15min are sufficiently stirred during dosing It mixes and breaks up；Food Packaging Paper will be made using small-sized fourdrinier paper machine as early as possible by having added the slurry of auxiliary agent.
Reagent is commercially available conventional reagent, the diethylene triamine pentacetic acid (DTPA) used, second two without specified otherwise in the present invention The reagents such as amine tetraacethyl, Peracetic acid, hydrogen peroxide, sodium hydroxide, sodium metasilicate, magnesium sulfate, sulfuric acid, hydrochloric acid are to analyze pure examination Agent.
Auxiliary agent in step (7) in use, can be configured to solution addition, such as mass percent concentration 0.5% sun from Sub- starch solution, 1%AKD lotion, 0.1% CPAM, 5% chitosan, 5% grease-proof and waterproof agent；Wherein grease-proof and waterproof agent is conventional commercial For food wrapper preparation in additive.
The present invention compared with the existing technology the advantages of:
(1) technical process is effectively controlled through the invention, makes the universal disadvantage of the properties such as fiber in wood raw material Fiber is used and is more cleaned for environmental protection and food safety with hemp's woody-core, but has certain loss to physical property of pulp TCF method for bleaching under the premise of, while with addition of the TCF long fibre market pulp board of less ratio, prepare ordinary food packaging This functional high quality paper kind of paper；
(2) hemp's woody-core chemical pulp uses TCF method for bleaching, and the drift agent Peracetic acid and hydrogen peroxide used is environmental protection Type bleaching agent, while having certain protective effect to the strength character of slurry: it is near-neutral sulfite deinking that Peracetic acid, which bleaches environment, and Peracetic acid is that a kind of strong oxidizer, normal reduction potential and chlorine and chlorine dioxide are suitable, and the mistake being higher than in alkaline medium Hydrogen oxide and oxygen have stronger delignification's effect, and bleach and float to the especially subsequent hydrogen peroxide of following bleaching White " activation " effect, viscosity loss is less while delignification, protects the strength character of fiber；And it, which is decomposed, produces Object is acetic acid and oxygen, environmental sound.And hydrogen peroxide bleaches pulp brightness stability after having easy to use, drift for paper pulp Well, many advantages, such as Technological adaptability is strong, contaminated wastewater is light, itself oxidisability is relatively mild, reacts with carbohydrate only It is set to lose less viscosity；And two sections of hydrogen peroxide bleachings are finally used, the control by technique is improving the same of whiteness When further protect the loss of carbohydrate.By both drift agent and the cooperation of oxygen and chelating agent, protect as far as possible The physical strength of hemp's woody-core TCF bleached pulp.
In short, hemp's woody-core chemical pulp using first use oxygen delignification, then cooperate Peracetic acid processing and two sections The terminal section of hydrogen peroxide is bleached, under the premise of environmental-friendly and food safety, it is contemplated that in delignification and guarantor as far as possible While protecting carbohydrate, paper pulp is made to reach the target of high whiteness and better quality in shorter driftage.Again by with addition of The TCF long fibre pulpboard commodity of less ratio can prepare this functional high quality paper kind of Food Packaging Paper, adopt The Food Packaging Paper made from the method for the present invention has whiteness high, and the good feature of intensity, paper meets professional standard (QBT 1014-2010).
Specific embodiment
Below by embodiment the invention will be further described explanation, but the scope of the present invention be not limited to it is described in Hold, grease-proof and waterproof agent used in embodiment is food-grade C6 grease-proof and waterproof agent (Daikin), the commodity long fibre TCF used Bleached pulp is that bleached softwood wooden chemistry starches (U.S.'s Southern Pine), but is not limited to using the type product.All percentages in embodiment In terms of than being mass percent, in bleaching process, the dosage of each section of reagent is carried out by the paper pulp absolute dry mass before oxygen delignification It calculates, the dosage of each section of reagent is calculated with paper pulp absolute dry mass after bleaching in paper-making process:
Embodiment 1: the method that this hemp's woody-core TCF bleached pulp prepares Food Packaging Paper, particular content are as follows:
Hemp's woody-core TCF bleached pulp is to have stripped the hemp's woody-core of hemp skin as raw material, to be about 3-5cm's in embodiment At section xylem core material；Raw material, which is screened, carries out alkali-AQ pulping, conditions of cooking in ZQL type electric cooking pot are as follows: liquid Than 1:4, alkali charge 20%(is in terms of NaOH), then the anthraquinone of paper pulp absolute dry mass 0.15% is added, it is used after digester idle running 10min 30min rises to 85 DEG C from initial temperature, then rises to 165 DEG C with 100min, and in 165 DEG C of heat preservation 150min；Boiling dissociates the feedstock into Fiber is placed in 300 mesh nylon wires slurry bag, is washed until washing water becomes clear non-foam, then with pulp screen to paper pulp with clear water Fiber carries out screening the pulp, extracts bleaching fibrous raw material, into bleaching process, steps are as follows:
(1) oxygen delignification: being in 10% paper pulp in pulp density, NaOH, the paper pulp of addition paper pulp absolute dry mass 2.5% are exhausted The bleaching assistant Na of dry mass 2%2SiO3With the cellulose protective agent MgSO of paper pulp absolute dry mass 0.6%4, after mixing evenly in temperature Degree is 100 DEG C, oxygen pressure handles 60min under the conditions of being 0.5MPa；
(2) clear water washing step (1) processed slurry, washing to pH=6.5-7.5 are used；
(3) chelation treatment: adjusting slurry initial pH value with sulfuric acid is 7.0, and is added in the paper pulp that pulp density is 10% The DTPA of paper pulp absolute dry mass 0.6% handles 60min at 80 DEG C of temperature after mixing evenly；
(4) step (3) processed slurry, washing to pH=6.5-7.5 are washed with distilled water；
(5) step (4) is washed into rear slurry and carries out Peracetic acid processing, adjust paper pulp pH value to 6, in pulp density with NaOH To add the bleaching stibilizer sodium pyrophosphate of paper pulp absolute dry mass 0.1% and 1.0% CH in 10% paper pulp3COOOH(is with activity Oxygen AO metering), 90min is handled under temperature 70 C after mixing evenly；
(6) step (5) processed slurry, washing to pH=6.5-7.5 are washed with distilled water；
(7) step (6) is washed rear slurry and carry out two sections of hydrogen peroxide bleaching processing: adjusting paper pulp pH value with NaOH is 11.5, the bleaching assistant Na of paper pulp absolute dry mass 2.5% is added in the paper pulp that slurry concentration is 10%2SiO3, 0.5% cellulose protect Protect agent MgSO4With 2.0% H2O2, 120min is bleached at 80 DEG C of temperature after mixing evenly, slurrying is distilled after first segment bleaching Water washing is to pH=6.5-7.5；Slurry adjusts paper pulp initial pH value to 11.5 with NaOH again after washing, is starching paper of the concentration for 10% The bleaching assistant Na of paper pulp absolute dry mass 2.5% is added in slurry2SiO3, 0.5% cellulose protective agent MgSO4With 1.0% H2O2、 120min is bleached at 80 DEG C of temperature after mixing evenly；
(8) step (7) processed slurry, washing to pH=6.5-7.5 are washed with distilled water；
(9) paper pulp after step (8) bleaching is matched with commodity long fibre bleached pulp and is copied: washing after bleaching slurry and commodity long fibre TCF bleached pulp distinguishes defibrination to 65oSR, by the commodity long fiber pulp of milled according to 25% proportion (relative to total oven dry stock matter Amount) it is mixed with the washing after bleaching of milled slurry；Slurry is broken up after mixing, and making to starch dense is 2g/L, sequentially adds paper pulp absolute dry mass The AKD(1% strength solution of 2.0% cationic starch (0.5% strength solution), paper pulp absolute dry mass 0.3%), paper pulp absolute dry mass 0.03% CPAM(0.1% strength solution), 0.5% chitosan of paper pulp absolute dry mass (5% strength solution), paper pulp absolute dry mass 0.03% grease-proof and waterproof agent (5% strength solution)；Every kind of medicament and slurry mixing time 10min are sufficiently stirred during dosing It mixes and breaks up；
(10) paper pulp that step (9) is handled well is copied on small-sized fourdrinier paper machine and Food Packaging Paper is made.
As a result: gained Food Packaging Paper reaches Food Packaging Paper standard (QBT 1014-2010) Grade A.
Embodiment 2: the method that this hemp's woody-core TCF bleached pulp prepares Food Packaging Paper, particular content are as follows:
Hemp's woody-core TCF bleached pulp is to have stripped the hemp's woody-core of hemp skin as raw material, to be about 3 ~ 5cm's in embodiment At section xylem core material；Raw material, which is screened, carries out kraft cooking, conditions of cooking in ZQL type electric cooking pot are as follows: liquor ratio 1:4, alkali charge 20%(is in terms of NaOH), sulphidity 22% with 30min rises to 85 DEG C from initial temperature after digester idle running 10min, then uses 100min rises to 165 DEG C, and in 165 DEG C of heat preservation 150min.Boiling dissociates the feedstock into fiber and is placed on 300 mesh nylon wires slurry bag In, it is washed until washing water becomes clear non-foam with clear water, then screening the pulp is carried out to paper pulp fiber with pulp screen, extracts bleaching and use Fibrous raw material, into bleaching process, steps are as follows:
(1) oxygen delignification: being in 12% paper pulp in pulp density, NaOH, the paper pulp of addition paper pulp absolute dry mass 3.0% are exhausted The bleaching assistant Na of dry mass 3%2SiO3With the cellulose protective agent MgSO of paper pulp absolute dry mass 0.5%4, after mixing evenly in temperature Degree is 100℃, oxygen pressure be 0.6MPa under the conditions of handle 60min；
(2) clear water washing step (1) processed slurry, washing to pH=6.5-7.5 are used；
(3) chelation treatment: adjusting slurry initial pH value with sulfuric acid is 6.0, and is added in the paper pulp that pulp density is 10% The DTPA of paper pulp absolute dry mass 0.5% handles 30min under temperature 70 C after mixing evenly；
(4) step (3) processed slurry, washing to pH=6.5-7.5 are washed with distilled water；
(5) step (4) is washed into rear slurry and carries out Peracetic acid processing, adjust paper pulp pH value to 5, in pulp density with NaOH To add the bleaching stibilizer sodium pyrophosphate of paper pulp absolute dry mass 0.15% and 1.2% CH in 10% paper pulp3COOOH(is with activity Oxygen AO metering), 60min is handled at 80 DEG C of temperature after mixing evenly；
(6) step (5) processed slurry, washing to pH=6.5-7.5 are washed with distilled water；
(7) step (6) is washed rear slurry and carry out two sections of hydrogen peroxide bleaching processing: adjusting paper pulp pH value with NaOH is 11.0, the bleaching assistant Na of paper pulp absolute dry mass 2.0% is added in the paper pulp that slurry concentration is 10%2SiO3, 0.5% cellulose protect Protect agent MgSO4With 1.5% H2O2, 150min is bleached at 80 DEG C of temperature after mixing evenly, slurrying is distilled after first segment bleaching Water washing is to pH=6.5-7.5.Slurry adjusts paper pulp initial pH value to 11.5 with NaOH again after washing, is starching paper of the concentration for 10% The bleaching assistant Na of paper pulp absolute dry mass 2.0% is added in slurry2SiO3, 0.5% cellulose protective agent MgSO4With 1.0% H2O2、 150min is bleached at 80 DEG C of temperature after mixing evenly；
(8) step (7) processed slurry, washing to pH=6.5-7.5 are washed with distilled water；
(9) paper pulp after step (8) bleaching is matched with commodity long fibre bleached pulp and is copied: washing after bleaching slurry and commodity long fibre TCF bleached pulp distinguishes defibrination to 65oSR, by the commodity long fiber pulp of milled according to 15% proportion (relative to total oven dry stock matter Amount) it is mixed with the hemp's woody-core bleached pulp of milled.Slurry is broken up after mixing, and making to starch dense is 2g/L, sequentially adds paper pulp over dry matter Amount 1.0% cationic starch (0.5% strength solution), paper pulp absolute dry mass 0.3% AKD(1% strength solution), paper pulp over dry matter Amount 0.02% CPAM(0.1% strength solution), 0.3% chitosan of paper pulp absolute dry mass (5% strength solution), paper pulp absolute dry mass 0.02% grease-proof and waterproof agent (5% strength solution)；Every kind of medicament and slurry mixing time 15min are sufficiently stirred during dosing It mixes and breaks up；
(10) paper pulp that step (9) is handled well is copied on small-sized fourdrinier paper machine and Food Packaging Paper is made.
As a result: gained Food Packaging Paper reaches Food Packaging Paper standard (QBT 1014-2010) qualified product.
Embodiment 3: the method that this hemp's woody-core TCF bleached pulp prepares Food Packaging Paper, particular content are as follows:
Hemp's woody-core TCF bleached pulp is to have stripped the hemp's woody-core of hemp skin as raw material, to be about 3 ~ 5cm's in embodiment At section xylem core material；Raw material is screened progress ammonium sulfite boiling, conditions of cooking are as follows: liquid in ZQL type electric cooking pot Than 1:4, ammonium sulfite, 5% urea and 0.2% anthraquinone of paper pulp absolute dry mass 19% are added, is used after digester idle running 10min 30min rises to 85 DEG C from initial temperature, then rises to 150 DEG C with 100min, and rise to 165 in 150 DEG C of heat preservation 45min, then with 30min DEG C, and in 165 DEG C of heat preservation 150min.Boiling dissociates the feedstock into fiber and is placed in 300 mesh nylon wires slurry bag, is washed with clear water Screening the pulp is carried out to paper pulp fiber until washing water becomes clear non-foam, then with pulp screen, extracts bleaching fibrous raw material, is entered Bleaching process, steps are as follows:
(1) oxygen delignification: being to add NaOH, the paper pulp over dry of paper pulp absolute dry mass 2% in 8% paper pulp in pulp density The bleaching assistant Na of quality 1.0%2SiO3With the cellulose protective agent MgSO of paper pulp absolute dry mass 0.4%4, after mixing evenly in temperature Degree is 100 DEG C, oxygen pressure handles 60min under the conditions of being 0.5MPa；
(2) clear water washing step (1) processed slurry, washing to pH=6.5-7.5 are used；
(3) chelation treatment: adjusting slurry initial pH value with sulfuric acid is 5.0, and is added in the paper pulp that pulp density is 8% The DTPA of paper pulp absolute dry mass 0.4% handles 60min under temperature 70 C after mixing evenly；
(4) step (3) processed slurry, washing to pH=6.5-7.5 are washed with distilled water；
(5) step (4) is washed into rear slurry and carries out Peracetic acid processing, adjust paper pulp pH value to 4, in pulp density with NaOH To add the bleaching stibilizer sodium pyrophosphate of paper pulp absolute dry mass 0.05% and 0.6% CH in 8% paper pulp3COOOH(is with activity Oxygen AO metering), 120min is handled under temperature 60 C after mixing evenly；
(6) step (5) processed slurry, washing to pH=6.5-7.5 are washed with distilled water；
(7) step (6) is washed rear slurry and carry out two sections of hydrogen peroxide bleaching processing: adjusting paper pulp pH value with NaOH is 11.0, the bleaching assistant Na of paper pulp absolute dry mass 3.0% is added in the paper pulp that slurry concentration is 8%2SiO3, 0.8% cellulose protect Protect agent MgSO4With 2.0% H2O2, 120min is bleached at 90 DEG C of temperature after mixing evenly, slurrying is distilled after first segment bleaching Water washing is to pH=6.5-7.5.Slurry adjusts paper pulp initial pH value to 11.0 with NaOH again after washing, is starching paper of the concentration for 8% The bleaching assistant Na of paper pulp absolute dry mass 3.0% is added in slurry2SiO3, 0.8% cellulose protective agent MgSO4With 1.5% H2O2、 150min is bleached at 80 DEG C of temperature after mixing evenly；
(8) step (7) processed slurry, washing to pH=7.5 are washed with distilled water；
(9) step (8) is washed into after bleaching slurry and commodity long fibre bleached pulp with copying: washing after bleaching slurry and commodity long fibre TCF bleached pulp distinguishes defibrination to 55oSR, by the commodity long fiber pulp of milled according to 30% proportion (relative to total oven dry stock matter Amount) it is mixed with the hemp's woody-core bleached pulp of milled.Slurry is broken up after mixing, and making to starch dense is 2g/L, sequentially adds paper pulp over dry matter Amount 1.5% cationic starch (0.5% strength solution), paper pulp absolute dry mass 0.25% AKD(1% strength solution), paper pulp over dry The CPAM(0.1% strength solution of quality 0.04%), 0.6% chitosan of paper pulp absolute dry mass (5% strength solution), paper pulp absolute dry mass 0.05% grease-proof and waterproof agent (5% strength solution)；Every kind of medicament and slurry mixing time 8min are sufficiently stirred during dosing It breaks up；
(10) paper pulp that step (9) is handled well is copied on small-sized fourdrinier paper machine and Food Packaging Paper is made.
As a result: gained Food Packaging Paper reaches Food Packaging Paper standard (QBT 1014-2010) Grade A.
Embodiment 4: the method that this hemp's woody-core TCF bleached pulp prepares Food Packaging Paper, particular content are as follows:
Hemp's woody-core TCF bleached pulp is to have stripped the hemp's woody-core of hemp skin as raw material, to be about 3 ~ 5cm's in embodiment At section xylem core material；Raw material, which is screened, carries out alkali-AQ pulping, conditions of cooking in ZQL type electric cooking pot are as follows: liquid Than 1:4.5, alkali charge 21%(is in terms of NaOH), then the anthraquinone of paper pulp absolute dry mass 0.2% is added, it is used after digester idle running 10min 30min rises to 85 DEG C from initial temperature, then rises to 165 DEG C with 120min, and in 165 DEG C of heat preservation 120min.Boiling dissociates the feedstock into Fiber is placed in 300 mesh nylon wires slurry bag, is washed until washing water becomes clear non-foam, then with pulp screen to paper pulp with clear water Fiber carries out screening the pulp, extracts bleaching fibrous raw material, into bleaching process, steps are as follows:
(1) oxygen delignification: being in 10% paper pulp in pulp density, NaOH, the paper pulp of addition paper pulp absolute dry mass 2.0% are exhausted The bleaching assistant Na of dry mass 3.0%2SiO3With the cellulose protective agent MgSO of paper pulp absolute dry mass 0.8%4, exist after mixing evenly Temperature is 100 DEG C, oxygen pressure bleaches 60min under the conditions of being 0.6MPa；
(2) clear water washing step (1) processed slurry, washing to pH=6.5-7.5 are used；
(3) chelation treatment: adjusting slurry initial pH value with sulfuric acid is 4.0, and is added in the paper pulp that pulp density is 10% The EDTA of paper pulp absolute dry mass 0.8% handles 30min at 90 DEG C of temperature after mixing evenly；
(4) step (3) processed slurry, washing to pH=6.5-7.5 are washed with distilled water；
(5) step (4) is washed into rear slurry and carries out Peracetic acid processing, adjust paper pulp pH value to 7, in pulp density with NaOH To add the bleaching stibilizer sodium pyrophosphate of paper pulp absolute dry mass 0.15% and 1.2% CH in 12% paper pulp3COOOH(is with activity Oxygen AO metering), 90min is handled at 80 DEG C of temperature after mixing evenly；
(6) step (5) processed slurry, washing to pH=6.5-7.5 are washed with distilled water；
(7) step (6) is washed rear slurry and carry out two sections of hydrogen peroxide bleaching processing: adjusting paper pulp pH value with NaOH is 11.5, the bleaching assistant Na of paper pulp absolute dry mass 2.0% is added in the paper pulp that slurry concentration is 12%2SiO3, 0.8% cellulose protect Protect agent MgSO4With 2.0% H2O2, 150min is bleached at 90 DEG C of temperature after mixing evenly, slurrying is distilled after first segment bleaching Water washing is to pH=6.5-7.5.Slurry adjusts paper pulp initial pH value to 11.5 with NaOH again after washing, is starching paper of the concentration for 12% The bleaching assistant Na of paper pulp absolute dry mass 2.0% is added in slurry2SiO3, 0.8% cellulose protective agent MgSO4With 1.5% H2O2、 120min is bleached at 80 DEG C of temperature after mixing evenly；
(8) step (7) processed slurry, washing to pH=6.5-7.5 are washed with distilled water；
(9) step (8) is washed into after bleaching slurry and commodity long fibre bleached pulp with copying: washing after bleaching slurry and commodity long fibre TCF bleached pulp distinguishes defibrination to 65oSR, by the commodity long fiber pulp of milled according to 15% proportion (relative to total oven dry stock matter Amount) it is mixed with the hemp's woody-core bleached pulp of milled.Slurry is broken up after mixing, and making to starch dense is 2g/L, sequentially adds paper pulp over dry matter Amount 1.5% cationic starch (0.5% strength solution), paper pulp absolute dry mass 0.3% AKD(1% strength solution), paper pulp over dry matter Amount 0.02% CPAM(0.1% strength solution), 0.4% chitosan of paper pulp absolute dry mass (5% strength solution), paper pulp absolute dry mass 0.04% grease-proof and waterproof agent (5% strength solution)；Every kind of medicament and slurry mixing time 5min are sufficiently stirred during dosing It breaks up；
(10) paper pulp that step (9) is handled well is copied on small-sized fourdrinier paper machine and Food Packaging Paper is made.
As a result: gained Food Packaging Paper reaches Food Packaging Paper standard (QBT 1014-2010) qualified product.

Claims (2)

1. a kind of method that hemp's woody-core total chlorine free bleaching slurry prepares food wrapper, it is characterised in that: with hemp's woody-core be original After material carries out conventional chemistry slurrying, total chlorine free bleaching is carried out to hemp's woody-core chemical pulp, gained bleached pulp matches elongated fibres TCF Bleached pulp, defibrination, and chitosan, cationic starch, cationic polyacrylamide, alkyl ketene dimer, grease-proof and waterproof is added Agent makes Food Packaging Paper；
Specific step is as follows for the above method:
(1) after carrying out conventional chemistry slurrying as raw material using hemp's woody-core, hemp's woody-core chemical pulp oxygen delignification is handled:
It is to add sodium hydroxide, the paper pulp absolute dry mass of paper pulp absolute dry mass 2.0-3.0% in 8%-12% paper pulp in pulp density The bleaching assistant sodium metasilicate of 1-3% and the cellulose protective agent magnesium sulfate of paper pulp absolute dry mass 0.4-0.8%, after mixing evenly in temperature Degree is 100 DEG C, oxygen pressure handles 60min under the conditions of being 0.4-0.6MPa；Slurry is washed with clear water to pH=6.5- after processing 7.5；
(2) chelation treatment: slurry pH value is adjusted after oxygen delignification to 3.0-7.0 with sulfuric acid or hydrochloric acid, and is in pulp density The diethylene triamine pentacetic acid (DTPA) or ethylenediamine tetra-acetic acid of paper pulp absolute dry mass 0.3-0.8% are added in the paper pulp of 6-12%, stirring is equal 30-60min is handled after even at 70-90 DEG C of temperature, slurry with water is washed to pH=6.5 ~ 7.5 after processing；
(3) slurry carries out Peracetic acid bleaching, actual conditions are as follows: slurry after being washed with NaOH regulating step (2) after washing PH value to 3-7, added in the paper pulp that pulp density is 8%-12% paper pulp absolute dry mass 0.05-0.15% sodium pyrophosphate and The Peracetic acid of 0.6-1.2%, wherein the amount of Peracetic acid is floated at 60-80 DEG C of temperature after mixing evenly with active oxygen AO metering White 60-120min is washed with distilled water to pH=6.5-7.5 after bleaching；
(4) slurry carries out hydrogen peroxide two-stage bleaching after washing, and is washed with distilled water to later between two sections with two sections PH=6.5 ~ 7.5, it is last up to paper pulp after bleaching；
Actual conditions are as follows: slurry initial pH value is 8-12% in slurry concentration to 10.5-11.5 after being washed with NaOH regulating step (3) Paper pulp in add paper pulp absolute dry mass 1.5-2.0% H2O2, 1-3% bleaching assistant Na2SiO3With the cellulose of 0.2-0.8% Protective agent MgSO4, 120-180min is bleached at 70-90 DEG C of temperature after mixing evenly, is washed with distilled water to after first segment drift pH=6.5-7.5；Paper pulp initial pH value is adjusted to 10.5-11.5, in the paper pulp that slurry concentration is 8-12% with NaOH again after washing Add the H of paper pulp absolute dry mass 1.0-1.5%2O2, 1-3% bleaching assistant Na2SiO3With the cellulose protective agent of 0.2-0.8% MgSO4, 120-180min is bleached at 70-90 DEG C of temperature after mixing evenly；
(5) paper pulp is matched with elongated fibres TCF bleached pulp and is copied after bleaching, and adds auxiliary agent, is made using small-sized fourdrinier paper machine general Logical food wrapper.
2. the method that hemp's woody-core total chlorine free bleaching slurry according to claim 1 prepares food wrapper, which is characterized in that The step of step (5) prepares Food Packaging Paper are as follows: distinguish paper pulp after step (4) bleaching and long fibre TCF bleached pulp Defibrination is to 50-70oSR, long fibre TCF bleached pulp is pressed relative to total oven dry stock quality 15-30%'s under the premise of identical beating degree Ratio carries out proportion with paper pulp after bleaching and mixes, and breaks up slurry after mixing, and making to starch dense is 2g/L, sequentially adds paper pulp over dry matter Measure the cationic starch of 1.0-2.0%, the alkyl ketene dimer of paper pulp absolute dry mass 0.2-0.3%, paper pulp absolute dry mass 0.02- 0.04% cationic polyacrylamide, paper pulp absolute dry mass 0.2-0.6 chitosan, paper pulp absolute dry mass 0.02-0.05% are grease proofing Waterproofing agent；Every kind of medicament and slurry mixing time 5-15min are sufficiently stirred during dosing and break up, added the slurry of auxiliary agent Food Packaging Paper is made using small-sized fourdrinier paper machine in material.
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CN111851106A (en) * 2019-04-26 2020-10-30 云南汉盟制药有限公司 Preparation method of industrial hemp stalk paper pulp and application of industrial hemp stalk paper pulp in paper preparation
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