CN111364268A - Production process of low-basis-weight middle partition paper - Google Patents
Production process of low-basis-weight middle partition paper Download PDFInfo
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- CN111364268A CN111364268A CN202010244689.8A CN202010244689A CN111364268A CN 111364268 A CN111364268 A CN 111364268A CN 202010244689 A CN202010244689 A CN 202010244689A CN 111364268 A CN111364268 A CN 111364268A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/32—Defibrating by other means of waste paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/34—Kneading or mixing; Pulpers
- D21B1/345—Pulpers
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/02—Methods of beating; Beaters of the Hollander type
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
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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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/28—Starch
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- 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
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Abstract
The invention provides a production process of low-basis-weight middle partition paper, which comprises the steps of proportioning, disintegrating, screening and purifying, concentrating, pulping, pulp proportioning, delivering, forming and compoundingThe method comprises the following steps of squeezing, drying, surface sizing, reeling and the like, wherein in the batching step, OCC waste paper with different grades is matched according to the determined raw material proportion of a produced product according to the fiber quality and the impurity content, the OCC waste paper comprises domestic waste paper and imported waste paper with the dosage of 10-30%, the imported waste paper comprises American waste paper, European waste paper and hong Kong waste paper, and the low-basis-weight intermediate paper produced by the production process of the low-basis-weight intermediate paper has the main physical indexes that: quantitative (60-65) +/-3 g/square meter, tightness greater than or equal to 0.50g/cm3The transverse ring pressure index is more than or equal to 3.0Nm/g, the longitudinal fracture length is more than or equal to 3.5km, the moisture content is 7.5-10.0 percent, and the water absorption is as follows: less than or equal to 50g per square meter, the quantitative rate of the septal paper product is reduced as much as possible on the premise that the strength index of the product meets the use purpose, and the use area of the product is obviously increased under the condition of the same weight, so that the development of low-carbon economy can be promoted.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to a pulping and papermaking production process, in particular to a production process of low-basis-weight middle partition paper.
[ background of the invention ]
From the perspective of pollutant emission reduction, the consumption of fresh water for pulping and papermaking by waste paper is small, and the pollution load and treatment difficulty of waste water for pulping and papermaking by waste paper are obviously lower than those of chemical pulping, so that the natural color waste paper pulping accords with the characteristics of circular economy development, comprehensive utilization of resources and clean production.
The middle partition paper is the sandwich partition paper which is made by the natural color paper pulp and used for manufacturing corrugated mediums of the corrugated board. From the structural analysis of the corrugated board, the contribution rate of the flat-pressing strength and the edge-pressing strength mainly comes from corrugated paper, surface paper and bottom paper, and the middle partition paper mainly plays a role in the connection among corrugated core layers, but in the specific production, the requirement of the combined carton production line on sufficient tensile strength is met, the proper water absorption is also kept, and the requirement of quick adhesion of starch glue is met. It can be seen that the septum paper has its own characteristics in both the use link and the product characteristics, and is different from the corrugated medium (original) paper in the general sense. In the manufacture of the traditional corrugated board, the partition paper is commonly used in a fixed quantity of100g/m2The corrugated core (raw) paper cannot meet the requirements of the current paper product packaging industry for continuously reducing the product ration, improving the product quality and reducing the outer packaging weight and the packaging cost of the product.
[ summary of the invention ]
The invention aims to solve the technical problem of providing a production process of low-basis-weight middle partition paper, so as to overcome the defects that the existing middle partition paper for corrugated boards has high basis weight and cannot meet the requirements of the current paper product packaging market.
The purpose of the invention is realized as follows:
a production process of low-basis weight middle partition paper comprises the following steps:
a: proportioning, namely, according to the fiber quality and the impurity content, matching OCC waste paper of different grades according to the determined raw material proportion of the produced product;
b: crushing, namely adding the mixed waste paper into white water, and changing the waste paper into coarse pulp with the beating degree of 22-28 DEG SR through infiltration, friction and defibering under the mechanical and hydraulic effects;
c: screening and purifying, namely purifying and sorting the coarse pulp by adopting pulp making equipment of an outward flow type pressure screen, a fiber separator, a slag discharge separator and a low-concentration desander;
d: concentrating, namely concentrating and washing long fiber slurry and short fiber slurry obtained by screening and purifying by using a multi-disc concentrator, wherein the concentration of the diluted slurry is 3.5-4.5%;
e: pulping, namely pulping the long fiber pulp through a double disc grinder so as to brood fibers and increase the bonding force of the fibers, so that the pulping degree of the long fiber pulp is 36-42 DEG SR;
f: pulp mixing, namely matching long fiber pulp and short fiber pulp in proportion, and sending the mixture into a pulp forming tower for later use, wherein the beating degree of the obtained paper pulp is 34-38 DEG SR;
g: flow conveying, namely performing concentration regulation, pulp flushing, pre-screening, uniform pulp distribution and pressure flow conveying on qualified paper pulp;
h: forming, namely forming uniform wet paper sheets on a forming plate of a fourdrinier former by the paper pulp, and dehydrating the wet paper sheets in a large amount through a scraping plate, a wet vacuum box, a vacuum box and a vacuum couch roll to ensure that the dryness of the wet paper sheets reaches 18-22 percent;
i: composite pressing, namely transferring and transferring the wet paper sheet from the net part through a papermaking felt, and performing combined dewatering of vacuum pressing and blind hole pressing on the wet paper sheet to ensure that the dryness of the wet paper sheet sent out of the pressing part reaches 44-46 percent;
j: drying, namely performing convection and radiation mass transfer on the moisture in the wet paper sheet by using a drying cylinder with the surface temperature of 60-120 ℃ to ensure that the dryness of the paper sheet reaches 90-94%;
k: surface sizing, namely performing surface treatment on paper sheets by adopting starch glue solution, summarizing the surface sizing process, immersing the starch glue solution into the paper sheets, and forming a film on the surfaces of the paper sheets through after-drying, thereby improving the ring crush strength of the paper sheets;
l: and (4) reeling, wherein the paper sheets form a finished paper roll on a horizontal winder.
In the production process of the low basis weight partition paper, in the batching step, the different grades of OCC waste paper comprise domestic waste paper and imported waste paper with the dosage of 10-30%, wherein the imported waste paper comprises American waste paper, European waste paper and hong Kong waste paper.
The production process of the low-basis-weight middle partition paper comprises the following steps:
b1: dry screening, namely scattering waste paper by using a bag scattering machine, removing heavy impurities such as soil, sand grains and the like brought in the waste paper, and removing dust by using a bag-type dust remover;
b2: high-concentration pulping, adding OCC mixed waste paper and white water into a drum pulper, and pulping the waste paper into paper pulp at the concentration of 14-18%;
b3: high-concentration desanding, namely conveying the crushed paper pulp into a high-concentration desander through a discharge pump to remove iron, sand and other large heavy impurities in the paper pulp;
b4: storing pulp, storing the crushed pulp in a pulp tower for later use, and fully soaking the fiber.
The production process of the low-basis-weight middle partition paper comprises the following steps of:
c1: coarse screening, namely performing coarse screening on the crushed paper pulp by using a hole screen with the hole diameter of phi 2.0-3.0mm under the concentration of 2.5-3.5%, further defibering two-stage and three-stage tail pulp by adopting a fiber separator and a slag discharge separator, and recovering qualified fibers;
c2: medium concentration desanding, namely further purifying the paper pulp subjected to coarse screening by using a medium concentration desander under the concentration of 2.0-2.5%, removing heavy impurities such as box nails, staples and the like, and protecting subsequent equipment;
c3: classifying long and short fibers, and classifying the pulp fibers by using a classifying screen with a screen slot of 0.25-0.30mm under the concentration of 2.0-2.5%, so as to strengthen the subsequent treatment of long fibers, simplify the treatment process of short fibers, effectively protect the length and width of the fibers and avoid excessive damage to the fibers, particularly the short fibers;
c4: the first-stage multi-section low-concentration desanding is carried out by using a low-concentration desander group under the concentration of 1.0-1.5% to purify by utilizing the gravity settling principle, and two-section, three-section and four-section low-concentration desanders are sequentially adopted to further separate tailings and recycle qualified fibers;
c5: the first stage multi-section fine screen is used for fine screening of long fiber pulp with a screen gap of 0.20-0.25mm under the concentration of 1.0-1.5%, and the second stage fine screen, a fiber separator and a slag discharging separator are used for further defibering and separating tailings to recover qualified fibers.
The production process of the low-basis weight middle partition paper comprises the following steps:
g1: concentration adjustment, namely transferring qualified paper pulp from a pulp making workshop to a pulp making pool, and adjusting concentration by using concentrated white water, wherein the concentration of a target range is 3.5-4.5%;
g2: flushing, namely feeding the papermaking pulp into a flushing tank, and regulating the pulp concentration to 0.6-1.5% of the pulp concentration of the upper net under the action of a flushing pump by blending with the net white water;
g3: adding papermaking chemicals, namely adding cationic electrolytes such as aluminum sulfate and the like for neutralizing negative charges in pulp and anionic retention and filtration aids such as polyacrylamide and the like for retention and filtration aid into a pulp flushing tank and a pulp inlet pipeline respectively, wherein the addition amounts of the cationic electrolytes and the retention and filtration aids are 0.05-0.10% and 0.02-0.06% respectively according to the weight percentage of the pulp making amount of stock solution and finished paper;
g4: screening before a screen, namely performing final screening on qualified paper pulp in an internal flow type pressure screen with a screen gap of 0.15-0.20 mm;
g5: the pulp distributor and the pulp flowing box send pulp into the taper pipe pulp distributor for homogenization to form micro-turbulence, and the pulp is sprayed on a forming net through the hydraulic pulp flowing box with full-width uniform pressure.
The production process of the low-basis-weight middle partition paper comprises the following steps:
h1: forming a fourdrinier wire, wherein paper pulp is formed and dewatered on a forming wire which rotates in a reciprocating manner under the action of a wire driving roller and a vacuum couch roll, and white water under the wire is discharged into a pulp flushing groove;
h2: and (3) performing vacuum dehydration, namely performing vacuum dehydration on the net part vacuum suction box, the vacuum couch roll, the vacuum suction transfer roll, the composite press vacuum roll and the press felt suction box by a water ring vacuum pump according to the vacuum degree requirements of different parts.
The production process of the low-basis-weight middle partition paper comprises the following steps:
j1: a front drying part for drying the wet paper from the pressing part by adopting a drying cylinder group, wherein the front drying part comprises 1 to 2 groups of drying cylinders which adopt a single-hanging drying cylinder, a paper web stabilizer and a cleaning roller device;
j2: drying in a post-drying part, namely drying the wet paper with the surface sizing dryness of 60-65% by using a drying cylinder group to ensure that the dryness of the paper reaches 90-94%, improving the strength of the paper and improving the surface performance of the paper, wherein 1-2 groups of drying cylinders in the post-drying part adopt chromium-plated drying cylinders;
j3: and multi-section steam ventilation is carried out, and a multi-section steam ventilation flow is designed by combining steam pressure, temperature, dosage, condensate water flash evaporation amount and the like, so that the temperature on the surface of the cylinder group is slowly increased from low to high, and the quality indexes such as paper strength and the like are ensured.
In the production process of the low-basis-weight middle-partition paper, the surface sizing step comprises the following steps:
k1: preparing a sizing material, namely converting, diluting and storing the raw cassava or corn starch under the action of alpha-amylase or an oxidant;
k2: sizing, adjusting starch glue solution to required viscosity, temperature and solid content, feeding the starch glue solution into a soaking type or film transfer surface sizing machine by a screw pump, and performing single-side or double-side sizing on paper sheets from a front drying part, wherein the application amount of the starch glue is 0.3-0.6 percent of the weight percentage of the original starch and the papermaking amount of finished paper;
k3: adding functional chemicals, namely adding functional papermaking chemicals such as water resistance and moisture resistance into starch or starch glue solution, wherein the functional papermaking chemicals comprise surface sizing agents such as styrene acrylate or AKD (alkyl ketene dimer) and the like, moisture-proof agents such as PVA (polyvinyl alcohol) or sodium stearate and the like, and the addition amounts of the surface sizing agents and the moisture-proof agents are respectively 0.01-0.04% and 0.02-0.08% according to the weight percentage of stock solution or solid and the papermaking amount of a finished paper, so that the surface properties such as water absorption and the like of the finished paper after surface sizing are further improved.
Compared with the prior art, the invention has the following characteristics:
1. the low basis weight middle partition paper produced by the production process of the low basis weight middle partition paper has the following main physical indexes: quantitative (60-65) +/-3 g/square meter, tightness greater than or equal to 0.50g/cm3The transverse ring pressure index is more than or equal to 3.0Nm/g, the longitudinal fracture length is more than or equal to 3.5km, the moisture content is 7.5-10.0 percent, and the water absorption is as follows: less than or equal to 50g per square meter.
2. On the premise that the strength index of the product meets the use purpose, the quantification of the middle partition paper product is reduced as much as possible, and the use area of the product is obviously increased under the condition of the same weight, so that the development of low-carbon economy can be promoted.
3. The invention develops advanced applicable pulping and papermaking technology by adopting secondary fiber raw materials such as OCC waste paper and the like to produce 60-65g/m2The low-quantitative middle partition paper increases the use area of the product, saves the consumption of resources such as energy, forest and the like, lightens the adverse effect of the traditional pulping on the environment, and is very environment-friendly.
4. The low-quantitative middle partition paper produced by the invention is 100g/m of the middle partition paper traditionally used for corrugated boards2Compared with the product, the method has the advantages that,under the condition of the same weight, the use area of the low-basis weight middle partition paper of 60-65g/m2 is increased by 67-54%, the energy conservation and emission reduction of the papermaking and paper product packaging industry are promoted, the circular economy and the low-carbon economy are implemented, and the sustainable development of the papermaking industry is realized.
5. The invention adopts a specific raw material formula, uses OCC waste paper raw materials and an optimized pulping process flow, effectively protects the fiber length and removes various impurities in the waste paper.
6. The paper machine is suitable for various paper making equipment, the running speed of the paper machine for producing the low-basis-weight middle partition paper reaches 400-800m/min, and the equipment running rate of the ratio of normal papermaking time to equipment running time can reach more than 88%.
7. The low-quantitative middle partition paper product produced by the invention has stable quality, and meets the market demands of rapid development of industrial packaging of household appliances and the like and express logistics industry.
[ description of the drawings ]
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:
FIG. 1 is one of the schematic process flows of the present invention;
FIG. 2 is a second schematic process flow diagram of the present invention.
[ detailed description ] embodiments
A first embodiment of a process for producing a low basis weight middle barrier paper, comprising the steps of:
1. and (4) batching. According to the fiber quality and the impurity content, OCC waste paper of different grades is matched according to the determined raw material proportion of the produced product. Under the premise of controlling the product cost, the effect of improving the physical strength index of the product is achieved by matching the imported waste paper raw material containing high-quality wood pulp fibers, and the matching amount reaches 10-30%. The imported waste paper includes AOCC (american waste paper), EOCC (european waste paper), HOCC (hong kong waste paper), and the like. The specific proportions of the waste paper are 10% of EOCC (European waste paper), 20% of HOCC (hong Kong waste paper) and 70% of LOCC (domestic waste paper).
2. And (6) crushing. Adding the mixed waste paper into white water, and changing the waste paper into coarse pulp through the actions of infiltration, friction and disintegration under the mechanical and hydraulic actions, wherein the beating degree of the obtained paper pulp is 22-28 DEG SR.
2.1, dry screening, namely scattering waste paper by using a bale breaker, removing heavy impurities such as soil, sand grains and the like brought in the waste paper, and matching with a bag-type dust collector;
2.2, high-concentration pulping, namely adding OCC mixed waste paper and white water into a drum pulper, and pulping the waste paper into paper pulp at the concentration of 14-18%;
2.3, high-concentration desanding, namely conveying the crushed paper pulp into a high-concentration desander through an unloading pump to remove iron, sand and other large heavy impurities in the paper pulp;
and 2.4, storing pulp, storing the crushed pulp in a pulp tower for later use, and fully soaking the fiber.
3. And (4) screening and purifying. According to the characteristics of fiber shape and density, pulping equipment such as an outward flow type pressure sieve, a fiber separator, a slag discharge separator, a low-concentration desander and the like is adopted to further purify and sort the coarse pulp, and a multi-section combination mode is adopted to reduce fiber loss.
3.1, coarse screening, namely performing coarse screening on the crushed paper pulp by using a hole screen with the hole diameter of phi 2.0-3.0mm under the concentration of 2.5-3.5%, and performing further defibering of two-section and three-section tail pulp by adopting a fiber separator and a slag discharge separator in the coarse screening process to recover qualified fibers;
3.2, removing sand by medium concentration, further purifying the paper pulp subjected to coarse screening by using a medium concentration sand remover under the concentration of 2.0-2.5%, removing heavy impurities such as box nails, staples and the like, and protecting subsequent equipment;
3.3, grading the long and short fibers, and grading the pulp fibers by using a grading sieve with a sieve gap of 0.25-0.30mm under the concentration of 2.0-2.5% according to the fiber length characteristic, so as to strengthen the subsequent treatment of the long fibers, simplify the treatment process of the short fibers, effectively protect the length and width of the fibers, and avoid excessive damage to the fibers, particularly the short fibers;
3.4, primary multi-section low-concentration desanding, wherein a low-concentration desander group is used for purifying under the concentration of 1.0-1.5% by utilizing the gravity settling principle, and a two-section, a three-section and a four-section low-concentration desander is adopted in the low-concentration desanding process for further separating tailings, so that qualified fibers are recovered;
3.5, a first-stage multi-section fine screen, wherein the long fiber pulp is finely selected by using a fine screen with a screen gap of 0.20-0.25mm under the concentration of 1.0-1.5%, and the fine screen process adopts a two-section fine screen, a fiber separator and a slag discharge separator to further defiber and separate tailings, so that qualified fibers are recovered.
4. And (5) concentrating. Concentrating and washing the purified and screened paper pulp by a multi-disc thickener, wherein the concentration of the diluted pulp is 3.5-4.5%.
5. And (6) pulping. The long fiber pulp is beaten by a double disc mill with the diameter of 720mm, fibers are broomed, the bonding force of the fibers is increased, and the beating degree of the obtained paper pulp is in the SR range of 36-42 degrees.
6. And (6) preparing slurry. According to the requirements of the produced products, the long and short fiber pulp is matched according to the proportion and sent into a pulp forming tower for standby, and the beating degree of the obtained paper pulp is 34-38 DEG SR.
7. And (4) streaming. And (3) carrying out concentration regulation, pulp flushing, screening before a net, uniform pulp distribution and pressure flow conveying on the qualified paper pulp.
7.1, thickening, namely transferring qualified paper pulp from a pulp making workshop to a pulp making pool, and thickening by utilizing thick white water, wherein the concentration of a target range is 3.5-4.5%;
7.2, slushing, namely feeding the papermaking pulp into a slushing tank, blending with the net white water, and adjusting the pulp concentration to 0.6-1.5% of the pulp concentration of the upper net under the action of a slushing pump;
7.3, adding papermaking chemicals, namely respectively adding cationic electrolytes such as Alum (aluminum sulfate) and the like for neutralizing negative charges in the pulp and anionic retention and filtration aids such as PAM (polyacrylamide) and the like for retention and filtration aid into a pulp washing tank and a pulp inlet pipeline, wherein the addition amounts of the cationic electrolytes and the retention and filtration aids are 0.05-0.10% and 0.02-0.06% respectively according to the weight percentage of the papermaking quantity of the stock solution and the finished paper;
7.4, screening before a screen, and finally screening qualified paper pulp in an internal flow type pressure screen with a screen gap of 0.15-0.20 mm;
7.5, a pulp distributor and a pulp flowing box, wherein paper pulp is sent into the taper pipe pulp distributor to be homogenized to form micro-turbulence, and the micro-turbulence is sprayed to a forming net through the hydraulic pulp flowing box under the full-width uniform pressure.
8. And (5) molding. The paper pulp forms uniform wet paper on a forming plate of a fourdrinier former and is largely dewatered by a water scraping plate, a wet vacuum box, a vacuum box and a vacuum couch roll, and the dryness of the wet paper reaches 18-22 percent.
8.1, forming a fourdrinier wire, forming and dehydrating wet paper sheets by paper pulp on a forming wire which rotates in a reciprocating manner under the action of a wire driving roller and a vacuum couch roll, and discharging white water under the wire into a pulp flushing tank;
and 8.2, performing vacuum dehydration on the net part vacuum suction box, the vacuum couch roll, the vacuum suction transfer roll, the composite pressing vacuum roll and the pressing felt suction box respectively by a water ring vacuum pump according to the vacuum degree requirements of different parts.
9. And (5) compounding and squeezing. The wet paper sheet from the net part is transferred and transferred through a papermaking felt, the composite pressing can be a three-roller K pressing structure and a large-roller blind hole pressing structure or a four-roller three-pressing structure, the wet paper sheet is subjected to combined dehydration of vacuum pressing and blind hole pressing, and the dryness of the wet paper sheet out of the pressing part reaches 44-46%.
10. And (5) drying. The paper drying machine is divided into a front drying part and a rear drying part, the surface temperature of a drying cylinder reaches 60-120 ℃ by utilizing the heat conductivity of the drying cylinder, convection and radiation mass transfer are carried out on moisture in wet paper sheets, wet hot air is discharged through a moisture discharging fan after heat exchange, and the dryness of the paper sheets reaches 90-94%.
10.1, drying in a front drying part, namely drying the wet paper from a pressing part by adopting a drying cylinder group according to a drying curve, wherein the drying cylinders in the front drying part 1-2 groups adopt a single-hanging drying cylinder, a paper web stabilizer and a cleaning roller device;
10.2, drying in an after-drying part, drying the wet paper with the surface sizing dryness of 60-65% by adopting a drying cylinder group according to a drying curve, wherein the paper dryness reaches 90-94%, the strength of the paper is improved, and the surface performance of the paper is improved, and the drying cylinders in 1-2 groups of the after-drying part adopt chromium-plated drying cylinders;
10.3, multi-section steam circulation, wherein in order to ensure the quality indexes such as paper strength and the like, the latent heat of steam is fully utilized, and a multi-section steam circulation flow is designed by combining steam pressure, temperature, dosage, condensate water flash evaporation amount and the like according to a paper drying curve, so that the surface temperature of the drying cylinder group is slowly increased from low to high.
11. And (4) surface sizing. The surface treatment is carried out on paper sheets by adopting starch glue solution, the surface sizing process is summarized, the starch glue solution is soaked into the paper sheets, and the paper sheets are subjected to after-drying to form films on the surfaces of the paper sheets, so that the indexes of the paper sheets, such as the ring crush strength, and the like, are improved.
11.1, preparing a sizing material, namely converting, diluting and storing the cassava or corn native starch under the action of alpha-amylase or an oxidant;
11.2, gluing, adjusting starch glue solution to required viscosity, temperature and solid content, feeding the starch glue solution into a soaking type or film transfer surface sizing machine by a screw pump, and performing single-side or double-side sizing on paper sheets from a front drying part, wherein the application amount of the starch glue is 0.3-0.6 percent of the papermaking amount of raw starch and finished paper;
11.3, adding functional chemicals, namely, adding functional papermaking chemicals such as water resistance and moisture resistance into starch or starch glue solution in order to further improve the surface properties such as water absorption and the like of finished paper sheets after surface sizing, wherein the surface sizing agents such as styrene acrylate or AKD (alkyl ketene dimer) and the like, and moisture-proof agents such as PVA (polyvinyl alcohol) or sodium stearate and the like are added, and the addition amounts of the surface sizing agents and the moisture-proof agents are respectively 0.01-0.04% and 0.02-0.08% according to the weight percentage of stock solution (or solid) and the papermaking amount of the finished paper sheets.
12. And (4) coiling. The paper sheets are formed into finished rolls on a horizontal winder.
Another embodiment of a process for producing a low basis weight intermediate barrier paper, comprising the steps of:
1. and (4) batching. According to the fiber quality and the impurity content, OCC waste paper of different grades is matched according to the determined raw material proportion of the produced product. Under the premise of controlling the product cost, the effect of improving the physical strength index of the product is achieved by matching the imported waste paper raw material containing high-quality wood pulp fibers, and the matching amount reaches 10-30%. The imported waste paper includes AOCC (american waste paper), EOCC (european waste paper), HOCC (hong kong waste paper), and the like. The proportion of the waste paper is 20 percent of EOCC (European waste paper): LOCC (domestic waste paper) 80%.
2. And (6) crushing. Adding the mixed waste paper into white water, and changing the waste paper into coarse pulp through the actions of infiltration, friction and disintegration under the mechanical and hydraulic actions, wherein the beating degree of the obtained paper pulp is 22-28 DEG SR.
2.1, dry screening, namely scattering waste paper by using a bale breaker, removing heavy impurities such as soil, sand grains and the like brought in the waste paper, and matching with a bag-type dust collector;
2.2, high-concentration pulping, adding OCC mixed waste paper and white water into a drum pulper, and pulping the waste paper into paper pulp at the concentration of 14-18%;
2.3, high-concentration desanding, namely conveying the crushed paper pulp into a high-concentration desander through an unloading pump to remove iron, sand and other large heavy impurities in the paper pulp;
and 2.4, storing pulp, storing the crushed pulp in a pulp tower for later use, and fully soaking the fiber.
3. And (4) screening and purifying. According to the characteristics of fiber shape and density, pulping equipment such as an outward flow type pressure sieve, a fiber separator, a slag discharge separator, a low-concentration desander and the like is adopted to further purify and sort the coarse pulp, and a multi-section combination mode is adopted to reduce fiber loss.
3.1, coarse screening, namely performing coarse screening on the crushed paper pulp by using a hole screen with the hole diameter of phi 2.0-3.0mm under the concentration of 2.5-3.5%, and performing further defibering of two-section and three-section tail pulp by adopting a fiber separator and a slag discharge separator in the coarse screening process to recover qualified fibers;
3.2, removing sand by medium concentration, further purifying the paper pulp subjected to coarse screening by using a medium concentration sand remover under the concentration of 2.0-2.5%, removing heavy impurities such as box nails, staples and the like, and protecting subsequent equipment;
3.3, grading the long and short fibers, and grading the pulp fibers by using a grading sieve with a sieve gap of 0.25-0.30mm under the concentration of 2.0-2.5% according to the fiber length characteristic, so as to strengthen the subsequent treatment of the long fibers, simplify the treatment process of the short fibers, effectively protect the length and width of the fibers, and avoid excessive damage to the fibers, particularly the short fibers;
3.4, primary multi-section low-concentration desanding, wherein a low-concentration desander group is used for purifying under the concentration of 1.0-1.5% by utilizing the gravity settling principle, and a two-section, a three-section and a four-section low-concentration desander is adopted in the low-concentration desanding process for further separating tailings, so that qualified fibers are recovered;
3.5, a first-stage multi-section fine screen, wherein the long fiber pulp is finely selected by using a fine screen with a screen gap of 0.20-0.25mm under the concentration of 1.0-1.5%, and the fine screen process adopts a two-section fine screen, a fiber separator and a slag discharge separator to further defiber and separate tailings, so that qualified fibers are recovered.
4. And (5) concentrating. Concentrating and washing the purified and screened paper pulp by a multi-disc thickener, wherein the concentration of the diluted pulp is 3.5-4.5%.
5. And (6) pulping. The long fiber pulp is beaten by a double disc mill with the diameter of 720mm, fibers are broomed, the bonding force of the fibers is increased, and the beating degree of the obtained paper pulp is in the SR range of 36-42 degrees.
6. And (6) preparing slurry. According to the requirements of the produced products, the long and short fiber pulp is matched according to the proportion and sent into a pulp forming tower for standby, and the beating degree of the obtained paper pulp is 34-38 DEG SR.
7. And (4) streaming. And (3) carrying out concentration regulation, pulp flushing, screening before a net, uniform pulp distribution and pressure flow conveying on the qualified paper pulp.
7.1, thickening, namely transferring qualified paper pulp from a pulp making workshop to a pulp making pool, and thickening by utilizing thick white water, wherein the concentration of a target range is 3.5-4.5%;
7.2, slushing, namely feeding the papermaking pulp into a slushing tank, blending with the net white water, and adjusting the pulp concentration to 0.6-1.5% of the pulp concentration of the upper net under the action of a slushing pump;
7.3, adding papermaking chemicals, namely respectively adding cationic electrolytes such as Alum (aluminum sulfate) and the like for neutralizing negative charges in the pulp and anionic retention and filtration aids such as PAM (polyacrylamide) and the like for retention and filtration aid into a pulp washing tank and a pulp inlet pipeline, wherein the addition amounts of the cationic electrolytes and the retention and filtration aids are 0.05-0.10% and 0.02-0.06% respectively according to the weight percentage of the papermaking quantity of the stock solution and the finished paper;
7.4, screening before a screen, and finally screening qualified paper pulp in an internal flow type pressure screen with a screen gap of 0.15-0.20 mm;
7.5, a pulp distributor and a pulp flowing box, wherein paper pulp is sent into the taper pipe pulp distributor to be homogenized to form micro-turbulence, and the micro-turbulence is sprayed to a forming net through the hydraulic pulp flowing box under the full-width uniform pressure.
8. And (5) molding. The paper pulp forms uniform wet paper on a forming plate of a fourdrinier former and is largely dewatered by a water scraping plate, a wet vacuum box, a vacuum box and a vacuum couch roll, and the dryness of the wet paper reaches 18-22 percent.
8.1, forming a fourdrinier wire, forming and dehydrating wet paper sheets by paper pulp on a forming wire which rotates in a reciprocating manner under the action of a wire driving roller and a vacuum couch roll, and discharging white water under the wire into a pulp flushing tank;
and 8.2, performing vacuum dehydration on the net part vacuum suction box, the vacuum couch roll, the vacuum suction transfer roll, the composite pressing vacuum roll and the pressing felt suction box respectively by a water ring vacuum pump according to the vacuum degree requirements of different parts.
9. And (2) carrying out composite pressing, namely transferring and transferring wet paper sheets from a net part through a papermaking felt, wherein the composite pressing can be a three-roller K-press structure and a large-roller blind hole pressing structure or a four-roller three-press structure, the wet paper sheets are subjected to combined dehydration of vacuum pressing and blind hole pressing, and the dryness of the wet paper sheets discharged from a pressing part reaches 44-46%.
10. And (5) drying. The paper drying machine is divided into a front drying part and a rear drying part, the surface temperature of a drying cylinder reaches 60-120 ℃ by utilizing the heat conductivity of the drying cylinder, convection and radiation mass transfer are carried out on moisture in wet paper sheets, wet hot air is discharged through a moisture discharging fan after heat exchange, and the dryness of the paper sheets reaches 90-94%.
10.1, drying in a front drying part, namely drying the wet paper from a pressing part by adopting a drying cylinder group according to a drying curve, wherein the drying cylinders in the front drying part 1-2 groups adopt a single-hanging drying cylinder, a paper web stabilizer and a cleaning roller device;
10.2, drying in an after-drying part, drying the wet paper with the surface sizing dryness of 60-65% by adopting a drying cylinder group according to a drying curve, wherein the paper dryness reaches 90-94%, the strength of the paper is improved, and the surface performance of the paper is improved, and the drying cylinders in 1-2 groups of the after-drying part adopt chromium-plated drying cylinders;
10.3, multi-section steam circulation, wherein in order to ensure the quality indexes such as paper strength and the like, the latent heat of steam is fully utilized, and a multi-section steam circulation flow is designed by combining steam pressure, temperature, dosage, condensate water flash evaporation amount and the like according to a paper drying curve, so that the surface temperature of the drying cylinder group is slowly increased from low to high.
11. And (4) surface sizing. The surface treatment is carried out on paper sheets by adopting starch glue solution, the surface sizing process is summarized, the starch glue solution is soaked into the paper sheets, and the paper sheets are subjected to after-drying to form films on the surfaces of the paper sheets, so that the indexes of the paper sheets, such as the ring crush strength, and the like, are improved.
11.1, preparing a sizing material, namely converting, diluting and storing the cassava or corn native starch under the action of alpha-amylase or an oxidant;
11.2, gluing, adjusting starch glue solution to required viscosity, temperature and solid content, feeding the starch glue solution into a soaking type or film transfer surface sizing machine by a screw pump, and performing single-side or double-side sizing on paper sheets from a front drying part, wherein the application amount of the starch glue is 0.3-0.6 percent of the papermaking amount of raw starch and finished paper;
11.3, adding functional chemicals, namely, adding functional papermaking chemicals such as water resistance and moisture resistance into starch or starch glue solution in order to further improve the surface properties such as water absorption and the like of finished paper sheets after surface sizing, wherein the surface sizing agents such as styrene acrylate or AKD (alkyl ketene dimer) and the like, and moisture-proof agents such as PVA (polyvinyl alcohol) or sodium stearate and the like are added, and the addition amounts of the surface sizing agents and the moisture-proof agents are respectively 0.01-0.04% and 0.02-0.08% according to the weight percentage of stock solution (or solid) and the papermaking amount of the finished paper sheets.
12. And (4) coiling. The paper sheets are formed into finished rolls on a horizontal winder.
Another embodiment of a process for producing a low basis weight middle barrier paper, comprising the steps of:
1. and (4) batching. According to the fiber quality and the impurity content, OCC waste paper of different grades is matched according to the determined raw material proportion of the produced product. Under the premise of controlling the product cost, the effect of improving the physical strength index of the product is achieved by matching the imported waste paper raw material containing high-quality wood pulp fibers, and the matching amount reaches 10-30%. The imported waste paper includes AOCC (american waste paper), EOCC (european waste paper), HOCC (hong kong waste paper), and the like. The specific proportion of the waste paper is AOCC (American waste paper) 10%: LOCC (domestic waste paper) 90%.
2. And (6) crushing. Adding the mixed waste paper into white water, and changing the waste paper into coarse pulp through the actions of infiltration, friction and disintegration under the mechanical and hydraulic actions, wherein the beating degree of the obtained paper pulp is 22-28 DEG SR.
2.1, dry screening, namely scattering waste paper by using a bale breaker, removing heavy impurities such as soil, sand grains and the like brought in the waste paper, and matching with a bag-type dust collector;
2.2, high-concentration pulping, adding OCC mixed waste paper and white water into a drum pulper, and pulping the waste paper into paper pulp at the concentration of 14-18%;
2.3, high-concentration desanding, namely conveying the crushed paper pulp into a high-concentration desander through an unloading pump to remove iron, sand and other large heavy impurities in the paper pulp;
and 2.4, storing pulp, storing the crushed pulp in a pulp tower for later use, and fully soaking the fiber.
3. And (4) screening and purifying. According to the characteristics of fiber shape and density, pulping equipment such as an outward flow type pressure sieve, a fiber separator, a slag discharge separator, a low-concentration desander and the like is adopted to further purify and sort the coarse pulp, and a multi-section combination mode is adopted to reduce fiber loss.
3.1, coarse screening, namely performing coarse screening on the crushed paper pulp by using a hole screen with the hole diameter of phi 2.0-3.0mm under the concentration of 2.5-3.5%, and performing further defibering of two-section and three-section tail pulp by adopting a fiber separator and a slag discharge separator in the coarse screening process to recover qualified fibers;
3.2, removing sand by medium concentration, further purifying the paper pulp subjected to coarse screening by using a medium concentration sand remover under the concentration of 2.0-2.5%, removing heavy impurities such as box nails, staples and the like, and protecting subsequent equipment;
3.3, grading the long and short fibers, and grading the pulp fibers by using a grading sieve with a sieve gap of 0.25-0.30mm under the concentration of 2.0-2.5% according to the fiber length characteristic, so as to strengthen the subsequent treatment of the long fibers, simplify the treatment process of the short fibers, effectively protect the length and width of the fibers, and avoid excessive damage to the fibers, particularly the short fibers;
3.4, primary multi-section low-concentration desanding, wherein a low-concentration desander group is used for purifying under the concentration of 1.0-1.5% by utilizing the gravity settling principle, and a two-section, a three-section and a four-section low-concentration desander is adopted in the low-concentration desanding process for further separating tailings, so that qualified fibers are recovered;
3.5, a first-stage multi-section fine screen, wherein the long fiber pulp is finely selected by using a fine screen with a screen gap of 0.20-0.25mm under the concentration of 1.0-1.5%, and the fine screen process adopts a two-section fine screen, a fiber separator and a slag discharge separator to further defiber and separate tailings, so that qualified fibers are recovered.
4. And (5) concentrating. Concentrating and washing the purified and screened paper pulp by a multi-disc thickener, wherein the concentration of the diluted pulp is 3.5-4.5%.
5. And (6) pulping. The long fiber pulp is beaten by a double disc mill with the diameter of 720mm, fibers are broomed, the bonding force of the fibers is increased, and the beating degree of the obtained paper pulp is in the SR range of 36-42 degrees.
6. And (6) preparing slurry. According to the requirements of the produced products, the long and short fiber pulp is matched according to the proportion and sent into a pulp forming tower for standby, and the beating degree of the obtained paper pulp is 34-38 DEG SR.
7. And (4) streaming. And (3) carrying out concentration regulation, pulp flushing, screening before a net, uniform pulp distribution and pressure flow conveying on the qualified paper pulp.
7.1, thickening, namely transferring qualified paper pulp from a pulp making workshop to a pulp making pool, and thickening by utilizing thick white water, wherein the concentration of a target range is 3.5-4.5%;
7.2, slushing, namely feeding the papermaking pulp into a slushing tank, blending with the net white water, and adjusting the pulp concentration to 0.6-1.5% of the pulp concentration of the upper net under the action of a slushing pump;
7.3, adding papermaking chemicals, namely respectively adding cationic electrolytes such as Alum (aluminum sulfate) and the like for neutralizing negative charges in the pulp and anionic retention and filtration aids such as PAM (polyacrylamide) and the like for retention and filtration aid into a pulp washing tank and a pulp inlet pipeline, wherein the addition amounts of the cationic electrolytes and the retention and filtration aids are 0.05-0.10% and 0.02-0.06% respectively according to the weight percentage of the papermaking quantity of the stock solution and the finished paper;
7.4, screening before a screen, and finally screening qualified paper pulp in an internal flow type pressure screen with a screen gap of 0.15-0.20 mm;
7.5, a pulp distributor and a pulp flowing box, wherein paper pulp is sent into the taper pipe pulp distributor to be homogenized to form micro-turbulence, and the micro-turbulence is sprayed to a forming net through the hydraulic pulp flowing box under the full-width uniform pressure.
8. And (5) molding. The paper pulp forms uniform wet paper on a forming plate of a fourdrinier former and is largely dewatered by a water scraping plate, a wet vacuum box, a vacuum box and a vacuum couch roll, and the dryness of the wet paper reaches 18-22 percent.
8.1, forming a fourdrinier wire, forming and dehydrating wet paper sheets by paper pulp on a forming wire which rotates in a reciprocating manner under the action of a wire driving roller and a vacuum couch roll, and discharging white water under the wire into a pulp flushing tank;
and 8.2, performing vacuum dehydration on the net part vacuum suction box, the vacuum couch roll, the vacuum suction transfer roll, the composite pressing vacuum roll and the pressing felt suction box respectively by a water ring vacuum pump according to the vacuum degree requirements of different parts.
9. And (5) compounding and squeezing. The wet paper sheet from the net part is transferred and transferred through a papermaking felt, the composite pressing can be a three-roller K pressing structure and a large-roller blind hole pressing structure or a four-roller three-pressing structure, the wet paper sheet is subjected to combined dehydration of vacuum pressing and blind hole pressing, and the dryness of the wet paper sheet out of the pressing part reaches 44-46%.
10. And (5) drying. The paper drying machine is divided into a front drying part and a rear drying part, the surface temperature of a drying cylinder reaches 60-120 ℃ by utilizing the heat conductivity of the drying cylinder, convection and radiation mass transfer are carried out on moisture in wet paper sheets, wet hot air is discharged through a moisture discharging fan after heat exchange, and the dryness of the paper sheets reaches 90-94%.
10.1, drying in a front drying part, namely drying the wet paper from a pressing part by adopting a drying cylinder group according to a drying curve, wherein the drying cylinders in the front drying part 1-2 groups adopt a single-hanging drying cylinder, a paper web stabilizer and a cleaning roller device;
10.2, drying in an after-drying part, drying the wet paper with the surface sizing dryness of 60-65% by adopting a drying cylinder group according to a drying curve, wherein the paper dryness reaches 90-94%, the strength of the paper is improved, and the surface performance of the paper is improved, and the drying cylinders in 1-2 groups of the after-drying part adopt chromium-plated drying cylinders;
10.3, multi-section steam circulation, wherein in order to ensure the quality indexes such as paper strength and the like, the latent heat of steam is fully utilized, and a multi-section steam circulation flow is designed by combining steam pressure, temperature, dosage, condensate water flash evaporation amount and the like according to a paper drying curve, so that the surface temperature of the drying cylinder group is slowly increased from low to high.
11. And (4) surface sizing. The surface treatment is carried out on paper sheets by adopting starch glue solution, the surface sizing process is summarized, the starch glue solution is soaked into the paper sheets, and the paper sheets are subjected to after-drying to form films on the surfaces of the paper sheets, so that the indexes of the paper sheets, such as the ring crush strength, and the like, are improved.
11.1, preparing a sizing material, namely converting, diluting and storing the cassava or corn native starch under the action of alpha-amylase or an oxidant;
11.2, gluing, adjusting starch glue solution to required viscosity, temperature and solid content, feeding the starch glue solution into a soaking type or film transfer surface sizing machine by a screw pump, and performing single-side or double-side sizing on paper sheets from a front drying part, wherein the application amount of the starch glue is 0.3-0.6 percent of the papermaking amount of raw starch and finished paper;
11.3, adding functional chemicals, namely, adding functional papermaking chemicals such as water resistance and moisture resistance into starch or starch glue solution in order to further improve the surface properties such as water absorption and the like of finished paper sheets after surface sizing, wherein the surface sizing agents such as styrene acrylate or AKD (alkyl ketene dimer) and the like, and moisture-proof agents such as PVA (polyvinyl alcohol) or sodium stearate and the like are added, and the addition amounts of the surface sizing agents and the moisture-proof agents are respectively 0.01-0.04% and 0.02-0.08% according to the weight percentage of stock solution (or solid) and the papermaking amount of the finished paper sheets.
12. And (4) coiling. The paper sheets are formed into finished rolls on a horizontal winder.
Claims (8)
1. A production process of low-basis weight middle partition paper is characterized by comprising the following steps:
a: proportioning, namely, according to the fiber quality and the impurity content, matching OCC waste paper of different grades according to the determined raw material proportion of the produced product;
b: crushing, namely adding the mixed waste paper into white water, and changing the waste paper into coarse pulp with the beating degree of 22-28 DEG SR through infiltration, friction and defibering under the mechanical and hydraulic effects;
c: screening and purifying, namely purifying and sorting the coarse pulp by adopting pulp making equipment of an outward flow type pressure screen, a fiber separator, a slag discharge separator and a low-concentration desander;
d: concentrating, namely concentrating and washing long fiber slurry and short fiber slurry obtained by screening and purifying by using a multi-disc concentrator, wherein the concentration of the diluted slurry is 3.5-4.5%;
e: pulping, namely pulping the long fiber pulp through a double disc grinder so as to brood fibers and increase the bonding force of the fibers, so that the pulping degree of the long fiber pulp is 36-42 DEG SR;
f: pulp mixing, namely matching long fiber pulp and short fiber pulp in proportion, and sending the mixture into a pulp forming tower for later use, wherein the beating degree of the obtained paper pulp is 34-38 DEG SR;
g: flow conveying, namely performing concentration regulation, pulp flushing, pre-screening, uniform pulp distribution and pressure flow conveying on qualified paper pulp;
h: forming, namely forming uniform wet paper sheets on a forming plate of a fourdrinier former by the paper pulp, and dehydrating the wet paper sheets in a large amount through a scraping plate, a wet vacuum box, a vacuum box and a vacuum couch roll to ensure that the dryness of the wet paper sheets reaches 18-22 percent;
i: composite pressing, namely transferring and transferring the wet paper sheet from the net part through a papermaking felt, and performing combined dewatering of vacuum pressing and blind hole pressing on the wet paper sheet to ensure that the dryness of the wet paper sheet sent out of the pressing part reaches 44-46 percent;
j: drying, namely performing convection and radiation mass transfer on the moisture in the wet paper sheet by using a drying cylinder with the surface temperature of 60-120 ℃ to ensure that the dryness of the paper sheet reaches 90-94%;
k: surface sizing, namely performing surface treatment on paper sheets by adopting starch glue solution, summarizing the surface sizing process, immersing the starch glue solution into the paper sheets, and forming a film on the surfaces of the paper sheets through after-drying, thereby improving the ring crush strength of the paper sheets;
l: and (4) reeling, wherein the paper sheets form a finished paper roll on a horizontal winder.
2. The process of claim 1, wherein in the blending step, the different grades of OCC waste paper comprise domestic waste paper and 10-30% imported waste paper, and the imported waste paper comprises American waste paper, European waste paper and hong Kong waste paper.
3. The process for producing a low basis weight middle barrier paper according to claim 1, wherein said disintegrating step comprises the steps of:
b1: dry screening, namely scattering waste paper by using a bag scattering machine, removing heavy impurities such as soil, sand grains and the like brought in the waste paper, and removing dust by using a bag-type dust remover;
b2: high-concentration pulping, adding OCC mixed waste paper and white water into a drum pulper, and pulping the waste paper into paper pulp at the concentration of 14-18%;
b3: high-concentration desanding, namely conveying the crushed paper pulp into a high-concentration desander through a discharge pump to remove iron, sand and other large heavy impurities in the paper pulp;
b4: storing pulp, storing the crushed pulp in a pulp tower for later use, and fully soaking the fiber.
4. The process for producing a low basis weight middle barrier paper according to claim 1, wherein the screening and purifying step comprises the steps of:
c1: coarse screening, namely performing coarse screening on the crushed paper pulp by using a hole screen with the hole diameter of phi 2.0-3.0mm under the concentration of 2.5-3.5%, further defibering two-stage and three-stage tail pulp by adopting a fiber separator and a slag discharge separator, and recovering qualified fibers;
c2: medium concentration desanding, namely further purifying the paper pulp subjected to coarse screening by using a medium concentration desander under the concentration of 2.0-2.5%, removing heavy impurities such as box nails, staples and the like, and protecting subsequent equipment;
c3: classifying long and short fibers, and classifying the pulp fibers by using a classifying screen with a screen slot of 0.25-0.30mm under the concentration of 2.0-2.5%, so as to strengthen the subsequent treatment of long fibers, simplify the treatment process of short fibers, effectively protect the length and width of the fibers and avoid excessive damage to the fibers, particularly the short fibers;
c4: the first-stage multi-section low-concentration desanding is carried out by using a low-concentration desander group under the concentration of 1.0-1.5% to purify by utilizing the gravity settling principle, and two-section, three-section and four-section low-concentration desanders are sequentially adopted to further separate tailings and recycle qualified fibers;
c5: the first stage multi-section fine screen is used for fine screening of long fiber pulp with a screen gap of 0.20-0.25mm under the concentration of 1.0-1.5%, and the second stage fine screen, a fiber separator and a slag discharging separator are used for further defibering and separating tailings to recover qualified fibers.
5. A process for producing a low basis weight middle barrier paper according to claim 1, wherein said flowing step comprises the steps of:
g1: concentration adjustment, namely transferring qualified paper pulp from a pulp making workshop to a pulp making pool, and adjusting concentration by using concentrated white water, wherein the concentration of a target range is 3.5-4.5%;
g2: flushing, namely feeding the papermaking pulp into a flushing tank, and regulating the pulp concentration to 0.6-1.5% of the pulp concentration of the upper net under the action of a flushing pump by blending with the net white water;
g3: adding papermaking chemicals, namely adding cationic electrolytes such as aluminum sulfate and the like for neutralizing negative charges in pulp and anionic retention and filtration aids such as polyacrylamide and the like for retention and filtration aid into a pulp flushing tank and a pulp inlet pipeline respectively, wherein the addition amounts of the cationic electrolytes and the retention and filtration aids are 0.05-0.10% and 0.02-0.06% respectively according to the weight percentage of the pulp making amount of stock solution and finished paper;
g4: screening before a screen, namely performing final screening on qualified paper pulp in an internal flow type pressure screen with a screen gap of 0.15-0.20 mm;
g5: the pulp distributor and the pulp flowing box send pulp into the taper pipe pulp distributor for homogenization to form micro-turbulence, and the pulp is sprayed on a forming net through the hydraulic pulp flowing box with full-width uniform pressure.
6. The process for producing a low basis weight middle barrier paper according to claim 1, wherein the forming step comprises the steps of:
h1: forming a fourdrinier wire, wherein paper pulp is formed and dewatered on a forming wire which rotates in a reciprocating manner under the action of a wire driving roller and a vacuum couch roll, and white water under the wire is discharged into a pulp flushing groove;
h2: and (3) performing vacuum dehydration, namely performing vacuum dehydration on the net part vacuum suction box, the vacuum couch roll, the vacuum suction transfer roll, the composite press vacuum roll and the press felt suction box by a water ring vacuum pump according to the vacuum degree requirements of different parts.
7. The process for producing a low basis weight middle barrier paper according to claim 1, wherein the drying step comprises the steps of:
j1: a front drying part for drying the wet paper from the pressing part by adopting a drying cylinder group, wherein the front drying part comprises 1 to 2 groups of drying cylinders which adopt a single-hanging drying cylinder, a paper web stabilizer and a cleaning roller device;
j2: drying in a post-drying part, namely drying the wet paper with the surface sizing dryness of 60-65% by using a drying cylinder group to ensure that the dryness of the paper reaches 90-94%, improving the strength of the paper and improving the surface performance of the paper, wherein 1-2 groups of drying cylinders in the post-drying part adopt chromium-plated drying cylinders;
j3: and multi-section steam ventilation is carried out, and a multi-section steam ventilation flow is designed by combining steam pressure, temperature, dosage, condensate water flash evaporation amount and the like, so that the temperature on the surface of the cylinder group is slowly increased from low to high, and the quality indexes such as paper strength and the like are ensured.
8. A process for producing a low basis weight intermediate paper according to claim 1, wherein said surface sizing step comprises the steps of:
k1: preparing a sizing material, namely converting, diluting and storing the raw cassava or corn starch under the action of alpha-amylase or an oxidant;
k2: sizing, adjusting starch glue solution to required viscosity, temperature and solid content, feeding the starch glue solution into a soaking type or film transfer surface sizing machine by a screw pump, and performing single-side or double-side sizing on paper sheets from a front drying part, wherein the application amount of the starch glue is 0.3-0.6 percent of the weight percentage of the original starch and the papermaking amount of finished paper;
k3: adding functional chemicals, namely adding functional papermaking chemicals such as water resistance and moisture resistance into starch or starch glue solution, wherein the functional papermaking chemicals comprise surface sizing agents such as styrene acrylate or AKD (alkyl ketene dimer) and the like, moisture-proof agents such as PVA (polyvinyl alcohol) or sodium stearate and the like, and the addition amounts of the surface sizing agents and the moisture-proof agents are respectively 0.01-0.04% and 0.02-0.08% according to the weight percentage of stock solution or solid and the papermaking amount of a finished paper, so that the surface properties such as water absorption and the like of the finished paper after surface sizing are further improved.
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| CN112878082A (en) * | 2021-03-12 | 2021-06-01 | 山东仁丰特种材料股份有限公司 | Preparation method of environment-friendly corrugated base paper for fruit and vegetable cold storage packaging |
| WO2022028201A1 (en) * | 2020-08-07 | 2022-02-10 | 山鹰纸业(广东)有限公司 | Dry waste paper pulp and preparation method therefor |
| CN116122071A (en) * | 2023-02-14 | 2023-05-16 | 杭州富伦生态科技有限公司 | Method for preparing base paper by using low-value recyclable material |
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| CN111929195A (en) * | 2020-08-05 | 2020-11-13 | 深圳市检验检疫科学研究院 | Method for detecting regenerated pulp inclusion |
| WO2022028201A1 (en) * | 2020-08-07 | 2022-02-10 | 山鹰纸业(广东)有限公司 | Dry waste paper pulp and preparation method therefor |
| CN112301780A (en) * | 2020-09-18 | 2021-02-02 | 江苏理文造纸有限公司 | Anionic garbage control process for papermaking system |
| CN112878082A (en) * | 2021-03-12 | 2021-06-01 | 山东仁丰特种材料股份有限公司 | Preparation method of environment-friendly corrugated base paper for fruit and vegetable cold storage packaging |
| CN116122071A (en) * | 2023-02-14 | 2023-05-16 | 杭州富伦生态科技有限公司 | Method for preparing base paper by using low-value recyclable material |
| CN116289283A (en) * | 2023-02-14 | 2023-06-23 | 杭州富伦生态科技有限公司 | Method for preparing paper pulp by using low-value recyclable material |
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