CN116623453A - Mixed pulping process for wood fibers and regenerated pulp - Google Patents
Mixed pulping process for wood fibers and regenerated pulp Download PDFInfo
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- CN116623453A CN116623453A CN202310563414.4A CN202310563414A CN116623453A CN 116623453 A CN116623453 A CN 116623453A CN 202310563414 A CN202310563414 A CN 202310563414A CN 116623453 A CN116623453 A CN 116623453A
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- 229920002522 Wood fibre Polymers 0.000 title claims abstract description 77
- 239000002025 wood fiber Substances 0.000 title claims abstract description 76
- 238000004537 pulping Methods 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000008569 process Effects 0.000 title claims abstract description 32
- 239000000835 fiber Substances 0.000 claims abstract description 57
- 239000002002 slurry Substances 0.000 claims abstract description 49
- 239000010893 paper waste Substances 0.000 claims abstract description 44
- 238000000227 grinding Methods 0.000 claims abstract description 32
- 239000002893 slag Substances 0.000 claims abstract description 28
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 230000000694 effects Effects 0.000 claims abstract description 16
- 239000012535 impurity Substances 0.000 claims abstract description 13
- 239000002562 thickening agent Substances 0.000 claims abstract description 12
- 238000010992 reflux Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000006185 dispersion Substances 0.000 claims abstract description 8
- 239000003513 alkali Substances 0.000 claims abstract description 7
- 238000012216 screening Methods 0.000 claims abstract description 5
- 238000004064 recycling Methods 0.000 claims abstract description 4
- 230000008961 swelling Effects 0.000 claims abstract description 4
- 238000009736 wetting Methods 0.000 claims abstract description 4
- 230000014759 maintenance of location Effects 0.000 claims description 34
- 238000004513 sizing Methods 0.000 claims description 33
- 238000001035 drying Methods 0.000 claims description 30
- 239000000463 material Substances 0.000 claims description 24
- 239000003795 chemical substances by application Substances 0.000 claims description 21
- 239000010410 layer Substances 0.000 claims description 21
- 239000002699 waste material Substances 0.000 claims description 21
- 238000007670 refining Methods 0.000 claims description 19
- 238000003825 pressing Methods 0.000 claims description 16
- 229920002472 Starch Polymers 0.000 claims description 13
- 238000010009 beating Methods 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 13
- 239000008107 starch Substances 0.000 claims description 13
- 235000019698 starch Nutrition 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 12
- 239000002344 surface layer Substances 0.000 claims description 12
- 238000012546 transfer Methods 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- 239000011148 porous material Substances 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 239000007888 film coating Substances 0.000 claims description 6
- 238000009501 film coating Methods 0.000 claims description 6
- 229920002401 polyacrylamide Polymers 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 239000004382 Amylase Substances 0.000 claims description 3
- 102000013142 Amylases Human genes 0.000 claims description 3
- 108010065511 Amylases Proteins 0.000 claims description 3
- 241000272525 Anas platyrhynchos Species 0.000 claims description 3
- 229920002261 Corn starch Polymers 0.000 claims description 3
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 3
- 235000019418 amylase Nutrition 0.000 claims description 3
- 239000008120 corn starch Substances 0.000 claims description 3
- 230000018044 dehydration Effects 0.000 claims description 3
- 238000006297 dehydration reaction Methods 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 230000035515 penetration Effects 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 125000002091 cationic group Chemical group 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000004806 packaging method and process Methods 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- 230000006872 improvement Effects 0.000 description 4
- 230000009172 bursting Effects 0.000 description 3
- 230000001934 delay Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 235000021197 fiber intake Nutrition 0.000 description 3
- 239000013051 drainage agent Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229920006317 cationic polymer Polymers 0.000 description 1
- 239000011436 cob Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- 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
- D21D1/30—Disc mills
-
- 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
-
- 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
- D21H11/14—Secondary fibres
-
- 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
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- Paper (AREA)
Abstract
The invention discloses a wood fiber and regenerated pulp mixed pulping process, which comprises the following steps of: crushing and deslagging: wood fiber and regenerated pulp were mixed according to 1: (0.5-0.8) is put into a chain plate machine according to the proportion, a vertical hydraulic pulper is utilized for pulping and fluffing, the disintegrating concentration is 5.5-6%, the diluted white water is heated by steam to control the disintegrating temperature to be 65-70 ℃, and meanwhile, liquid alkali with the PH of more than 6.2 is added, so that the wetting and swelling of fibers are ensured, and the fiber shape and toughness are improved; screening and removing impurities and crude fiber bundles in the slurry through a high-concentration slag remover after the slurry is crushed, and feeding the slag removed into a waste paper line for recycling; pulping: selecting a grinding disc suitable for coarse fiber pulping, and obtaining regenerated pulp/wood fiber mixed pulping with good pulping effect by controlling high pulping concentration and high reflux quantity; the regenerated pulp/wood fiber is mixed, ground and diluted to the concentration of 2.3-2.8%, then directly added into a long fiber multi-disc thickener of OCC waste paper line, and further ground and treated with waste paper pulp through long fiber thermal dispersion and a disc grinder, and then added into a bottom layer for pulp preparation.
Description
Technical field:
the invention relates to the technical field of pulping and papermaking, in particular to a wood fiber and regenerated pulp mixed pulping process.
The background technology is as follows:
for survival development, domestic enterprises actively seek to replace raw materials, wherein the raw materials comprise wood fibers and waste paper which are formed by carrying out simple processing and hot grinding on wood chips, and the wood fibers and the waste paper are processed into regenerated pulp meeting import standards. The wood fiber has the advantages of simple production process, low cost and the like, but impurities which have great influence on papermaking, such as lignin and the like, are not removed, so that the bulk and air permeability of the produced finished paper are increased, and the strength and binding force are obviously reduced.
The traditional wood fiber adding treatment mode firstly comprises the steps of crushing, screening, purifying and pulping according to the proportion of waste paper, but the waste is caused by great loss in a screening section due to the structural characteristics of the fiber, and the pulping effect is poor, so that the paper forming index is affected; or, the wood fiber is separately crushed and ground and then mixed with the waste paper pulp, so that the grinding effect is improved, but the problems of increased energy consumption, large equipment (mainly a disc grinding sheet) loss and the like are brought.
Therefore, a wood fiber treatment technology which can ensure the pulping effect and solve the problems of high energy consumption and equipment loss is found to be significant for the packaging paper production enterprises.
In view of this, the present inventors have proposed the following means.
The invention comprises the following steps:
the invention aims to overcome the defects of the prior art and provides a wood fiber and regenerated pulp mixed pulping process.
In order to solve the technical problems, the invention adopts the following technical scheme: the wood fiber and regenerated pulp mixed pulping process comprises the following steps: crushing and deslagging: wood fiber and regenerated pulp were mixed according to 1: (0.5-0.8) is put into a chain plate machine according to the proportion, a vertical hydraulic pulper is utilized for pulping and fluffing, the disintegrating concentration is 5.5-6%, the diluted white water is heated by steam to control the disintegrating temperature to be 65-70 ℃, and meanwhile, liquid alkali with the PH of more than 6.2 is added, so that the wetting and swelling of fibers are ensured, and the fiber shape and toughness are improved; screening and removing impurities and crude fiber bundles in the slurry through a high-concentration slag remover after the slurry is crushed, and enabling the slurry to enter a pre-tapping tank, wherein the slag can be thrown into a waste paper line for recycling; pulping: selecting a grinding disc suitable for coarse fiber pulping, obtaining regenerated pulp/wood fiber mixed pulping with good pulping effect by controlling high pulping concentration and high reflux quantity, and entering a post-beating tank; the regenerated pulp/wood fiber in the beating pond is mixed, ground and diluted to the concentration of 2.3-2.8%, then directly added into a long fiber multi-disc thickener of an OCC waste paper line, and further ground and treated with waste paper pulp through long fiber thermal dispersion and a disc grinder, and then added into bottom pulp to form bottom pulp required by a paper machine papermaking process.
Further, in the technical scheme, during pulping, the grinding disc is selected from domestic duck green river TF4E48-3555; high refining concentration means refining concentration is: 5% -5.5%; disc grinding power: 500-600 kw, the high reflux amount means the reflux amount is: 4000-5000 l/min; differential pressure: 30-80 kpa; the treatment amount is as follows: 200-250 tons/day.
In the technical scheme, the freeness of the regenerated pulp/wood fiber mixed pulp after pulp refining is as follows: 750-800 ml of inlet, 550-650 ml of outlet and 15-25% of freeness; the liquid alkali is added in a proportion of 10 kg/ton of absolute dry pulp.
In the technical scheme, the OCC waste paper line comprises the following process flows: 100% national waste, a chain plate machine, a rotary drum pulper, a high-concentration slag remover, a coarse screen, a classifying screen, a low-concentration slag remover, a fine screen, a long-fiber multi-disc thickener, thermal dispersion, a pre-beating pulp tank, disc grinding pulping, a post-beating pulp tank and a paper machine feeding system.
Further, in the above technical scheme, the paper making process of the paper machine comprises the following steps: the method comprises the steps of feeding a paper machine, a double-layer fourdrinier, four-roller three-press type squeezing, an eight-group front drying cylinder drying system, a film transfer sizing machine, a three-group drying cylinder drying system, a calender, coiling, rewinding and offline, a film coating machine and warehousing.
Further, in the above technical scheme, the paper machine feeding system: the surface sizing agent and the bottom sizing agent which are pulped are respectively further screened and purified, and chemical auxiliary materials which enable the finished paper to have the use characteristics are added in the process; double-deck fourdrinier machine: feeding the slurry into a net, dehydrating and forming the surface layer slurry and the bottom layer slurry by gravity and vacuum, wherein the dryness is 21-24%; four-roll three-press type: the wet paper web which is preliminarily dewatered and formed is further dewatered by pressing, wherein the pressing comprises vacuum pressing, blind roller pressing and shoe pressing, and the dryness is 48-52%; eight sets of forward cylinder drying systems: as a front drying section, drying the paper web by steam to obtain a dryness of 88-92%; film transfer size press: coating starch sizing material on the surface of the paper web, filling the surface pores of the paper sheet with the starch sizing material, and reducing the pore diameter of micropores so as to reduce the penetration of liquid and endow the paper with certain strength and water resistance; three groups of dryer drying systems: as a post-drying section, carrying out steam drying and dehydration on the wet paper web after sizing, wherein the dryness is 90-92%; and (3) a calender: finishing the dried paper, and improving the flatness, glossiness and tightness of the paper; and (3) coiling: rolling the web into rolls at the end of the machine for storage and further processing; rewinding: dividing the coiled large paper roll into small paper rolls according to the size requirement; film coating machine: coating a layer of stretching film with the thickness of 0.01-0.03mm on the small paper roll after rewinding and slitting to prevent the paper roll from being damaged, dehydrated or rewetted; and (5) warehousing: and adding the materials into a warehouse for storage and delivering the materials on demand.
Furthermore, in the above technical scheme, the starch sizing material comprises the following components in percentage by weight: 80-95% of corn starch; 1.5-10% of a surface sizing agent; 0.02-0.05% of active amylase; 1.5 to 10 percent of aluminum sulfate.
Further, in the above technical scheme, the composition ratio of the surface layer slurry is 100% of OCC waste pulp, wherein the raw material ratio of the OCC waste pulp is 40-60% of national waste class AB and 40-60% of national waste class CD; the bottom layer slurry comprises 12% of regenerated pulp/wood fiber mixed ground pulp and 88% of OCC waste paper pulp, and the raw materials of the OCC waste paper pulp comprise 40-60% of national waste AB grade and 40-60% of national waste CD grade.
Further, in the above technical solution, the chemical auxiliary material includes a binary retention and drainage agent, the binary retention and drainage agent includes a powder retention agent Nuoerpol8310 and a liquid retention agent Nuoerform860, wherein the adding amount of the powder retention agent Nuoerpol8310 in the surface layer slurry is 0.4-0.6 kg/ton of absolute dry slurry, and the adding amount of the powder retention agent Nuoerpol8310 in the bottom layer slurry is 0.8-1.0 kg/ton of absolute dry slurry; the addition amount of the liquid retention aid NuoERform860 in the surface layer slurry is 0.3-0.4 kg/ton of absolute dry slurry, and the addition amount of the liquid retention aid NuoERform860 in the bottom layer slurry is 0.3-0.4 kg/ton of absolute dry slurry.
Furthermore, in the above technical solution, the powder retention aid Nuoerpol8310 is a cationic polymer polyacrylamide polymer particle; the liquid retention aid Nuoerform860 is a water-soluble high molecular polyacrylamide derivative.
By adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the invention adopts the mode of wood fiber/regenerated pulp mixing disintegration and pulping, the soft and fine fiber in the regenerated pulp and the coarse and hard fiber in the wood fiber are fully mixed and stirred in a vertical hydraulic pulper and then enter a disc mill for pulping, thus better pulping effect can be obtained, and meanwhile, the addition of the regenerated pulp protects the abrasive disc in the disc mill, delays the service cycle of the abrasive disc, prolongs the service life of the abrasive disc, reduces the production cost and improves the competitiveness. By mixing and pulping, the pulping effect is improved by more than 10%, the folding resistance of the finished paper is improved by more than 50%, and the air permeability is reduced by more than 10%.
2. Freeness of pulping under the same parameters compared with common single wood fiber: the inlet is 800-850 ml, the outlet is 750-800 ml, and the lifting rate is only 6-10%. Freeness of regenerated pulp/wood fiber mixed pulp grinding prepared by the invention: 750-800 ml of inlet, 550-650 ml of outlet, and 15-25% of lifting, namely the lifting proportion of the freeness of the regenerated pulp/wood fiber mixed pulp grinding is larger.
3. According to the invention, after the wood fibers and the regenerated pulp are mixed and crushed, the wood fibers and the regenerated pulp are subjected to an independent high-concentration slag remover, and impurities and crude fiber bundles are extracted by carrying out high-concentration slag removal treatment by the high-concentration slag remover, so that the mixed pulp contains fewer impurities, and the slag removal treatment together with the waste paper pulp in the OCC waste paper is not needed, so that the fiber loss can be reduced by 10-20%; the wood fiber and the regenerated pulp are only added into the bottom pulp, so that the cleanness and the fineness of the appearance of the surface pulp are ensured, and the quality of the finished product packaging paper manufactured by a later paper machine is better. In addition, the mixed pulp of wood fiber and regenerated pulp is directly added into a long-fiber multi-disc thickener of OCC waste paper wire and then is mixed with pulp at the bottom layer, so that the problems of paper bursting, dark color and the like caused by adding surface pulp are avoided, the paper quality is improved, the wood fiber consumption can be improved by 20 percent due to the improvement of the paper quality, the waste paper pulp consumption is reduced, and the paper making cost can be saved.
Description of the drawings:
fig. 1 is a flow chart of the present invention.
The specific embodiment is as follows:
the invention will be further described with reference to specific examples and figures.
As shown in fig. 1, the method is a process for mixing and refining wood fiber and regenerated pulp, and comprises the following steps:
crushing and deslagging: wood fiber and regenerated pulp were mixed according to 1: (0.5-0.8) is put into a chain plate machine 101 in proportion, a vertical hydraulic pulper 102 is utilized for pulping and fluffing, the disintegrating concentration is 5.5-6%, the diluted white water is heated by steam to control the disintegrating temperature to be 65-70 ℃, and meanwhile, liquid alkali with the PH of more than 6.2 is added, so that the wetting and swelling of fibers are ensured, and the fiber shape and toughness are improved; wherein the liquid alkali is added in a proportion of 10 kg/ton of absolute dry pulp; after the pulp is crushed, impurities and crude fiber bundles in the pulp are screened and removed by a high-concentration slag remover 103, and the pulp enters a pre-tapping tank 104, and the slag can be thrown into a waste paper line for recycling, so that the effect of excellent environmental protection is achieved.
Pulping: selecting a grinding sheet suitable for coarse fiber pulping, obtaining regenerated pulp/wood fiber mixed pulping with good pulping effect by controlling high pulping concentration and high reflux quantity, and entering a post-beating tank 105; specifically, during pulping, the grinding disc of the disc mill 106 is selected from domestic duck green river TF4E48-3555; high refining concentration means refining concentration is: 5% -5.5%; disc grinding power: 500-600 kw, the high reflux amount means the reflux amount is: 4000-5000 l/min; differential pressure: 30-80 kpa; the treatment amount is as follows: 200-250 tons/day.
The regenerated pulp/wood fiber in the beating pond is mixed, ground and diluted to the concentration of 2.3-2.8%, then directly added into a long fiber multi-disc thickener of an OCC waste paper line, and further ground and treated with waste paper pulp through long fiber thermal dispersion and a disc grinder, and then added into bottom pulp to form bottom pulp required by a paper machine papermaking process.
In the disintegration and deslagging step, wood fibers and regenerated pulp are mixed according to the following ratio of 1: (0.5-0.8) into a chain plate machine, specifically: 60% wood fiber +40% recycled pulp.
The invention adopts the mode of wood fiber/regenerated pulp mixing disintegration and pulping, the soft and fine fiber in the regenerated pulp and the coarse and hard fiber in the wood fiber are fully mixed and stirred in a vertical hydraulic pulper and then enter a disc mill for pulping, thus better pulping effect can be obtained, and meanwhile, the addition of the regenerated pulp protects the abrasive disc in the disc mill, delays the service cycle of the abrasive disc, prolongs the service life of the abrasive disc, reduces the production cost and improves the competitiveness. By mixing and pulping, the pulping effect is improved by more than 10%, the folding resistance of the finished paper is improved by more than 50%, and the air permeability is reduced by more than 10%. Furthermore, freeness of refining under the same parameters compared to general wood fibers alone: the inlet is 800-850 ml, the outlet is 750-800 ml, and the lifting rate is only 6-10%. Freeness of regenerated pulp/wood fiber mixed pulp grinding prepared by the invention: 750-800 ml of inlet, 550-650 ml of outlet, and 15-25% of lifting, namely the lifting proportion of the freeness of the regenerated pulp/wood fiber mixed pulp grinding is larger. In addition, after the wood fiber and the regenerated pulp are mixed and crushed, the wood fiber and the regenerated pulp are subjected to a single high-concentration slag remover, and impurities and crude fiber bundles are extracted by the high-concentration slag remover through high-concentration slag removal treatment, so that the mixed pulp contains fewer impurities, and the slag removal treatment together with the waste paper pulp in the OCC waste paper is not needed, and the fiber loss can be reduced by 10-20%; the wood fiber and the regenerated pulp are only added into the bottom pulp, so that the cleanness and the fineness of the appearance of the surface pulp are ensured, and the quality of the finished product packaging paper manufactured by a later paper machine is better. In addition, the mixed pulp of wood fiber and regenerated pulp is directly added into a long-fiber multi-disc thickener of OCC waste paper wire and then is mixed with pulp at the bottom layer, so that the problems of paper bursting, dark color and the like caused by adding surface pulp are avoided, the paper quality is improved, the wood fiber consumption can be improved by 20 percent due to the improvement of the paper quality, the waste paper pulp consumption is reduced, and the paper making cost can be saved.
The addition ratio of the mixed slurry of the wood fiber and the regenerated slurry can reach 12-18% of the whole raw material, wherein the wood fiber can reach 7-10%.
The OCC waste paper line comprises the following process flows: 100% national waste, a chain plate machine 201, a rotary drum pulper 202, a high-concentration slag remover 203, a coarse screen 204, a classifying screen 205, a low-concentration slag remover 206, a fine screen 207, a long-fiber multi-disc thickener 208, thermal dispersion 209, a pre-beating pulp tank 210, disc grinding pulping 211, a post-beating pulp tank 212 and a paper machine feeding system.
Specifically, the OCC waste paper line comprises the process flows of feeding 100% of waste raw materials into a chain plate machine, conveying the waste raw materials to a rotary drum pulper by the chain plate machine, disintegrating the waste raw materials by the rotary drum pulper, separating metal and glass crushed impurities in pulp by the high-concentration slag separator, further removing impurities in the pulp by the coarse screen, the classifying screen, the low-concentration slag separator and the fine screen, classifying the pulp into long fiber pulp, medium fiber pulp and short fiber pulp according to different fiber sizes by the classifying screen, removing part of water in the long fiber pulp by the long fiber multi-disc thickener, improving the concentration, then feeding the long fiber pulp into a heat dispersing device for treatment, dispersing the heat fused matters in the long fiber pulp into particles invisible to meat eyes by the heat dispersing device under the action of high temperature and mechanical force, so as to improve the appearance quality of finished paper (namely high-grade packaging paper), pulping the pulp by disc mill, and then feeding the pulp into a post-beating pulp tank. The regenerated pulp/wood fiber mixed pulp is diluted to a concentration of 2.3-2.8%, and then is directly added into a long fiber multi-disc thickener of an OCC waste paper line, and is further subjected to pulp grinding treatment by a long fiber thermal dispersion and disc grinder with long fiber pulp in waste paper pulp, and then is added into bottom pulp for bottom pulp preparation, so that bottom pulp required by a paper machine papermaking process is formed.
The paper machine papermaking process comprises the following steps: the method comprises the following steps of feeding system of a paper machine, double-layer long-wire paper machine, four-roller three-press type squeezing, eight-group front drying cylinder drying system, film transfer sizing machine, three-group drying cylinder drying system, calender, coiling, rewinding and offline, film coating machine and warehousing, wherein each step comprises the following specific steps:
and a paper machine feeding system: the surface sizing agent and the bottom sizing agent which are pulped are respectively further screened and purified, and chemical auxiliary materials which enable the finished paper to have the use characteristics are added in the process; wherein, the composition ratio of the surface layer slurry is 100 percent of OCC waste paper pulp, and the raw material ratio of the OCC waste paper pulp is 40-60 percent of national waste AB grade and 40-60 percent of national waste CD grade; the bottom layer slurry comprises 12% of regenerated pulp/wood fiber mixed ground pulp and 88% of OCC waste paper pulp, and the raw materials of the OCC waste paper pulp comprise 40-60% of national waste AB grade and 40-60% of national waste CD grade.
The chemical auxiliary materials comprise a binary retention and drainage aid, wherein the binary retention and drainage aid comprises a powder retention agent Nuoerpol8310 and a liquid retention agent Nuoerform860, the adding amount of the powder retention agent Nuoerpol8310 in surface layer slurry is 0.4-0.6 kg/ton of absolute dry slurry, and the adding amount of the powder retention agent Nuoerpol8310 in bottom layer slurry is 0.8-1.0 kg/ton of absolute dry slurry; the addition amount of the liquid retention aid NuoERform860 in the surface layer slurry is 0.3-0.4 kg/ton of absolute dry slurry, and the addition amount of the liquid retention aid NuoERform860 in the bottom layer slurry is 0.3-0.4 kg/ton of absolute dry slurry. The powder retention aid Nuoerpol8310 is a cationic high molecular polyacrylamide polymer particle, has extremely strong fibers and fine fibers, has the capacity of flocculating fillers, and improves the first-pass retention rate of paper sheets; the liquid retention aid Nuoerform860 is a water-soluble high molecular polyacrylamide derivative. The high-molecular-weight high-positive-charge-density high-cationic-charge-density papermaking machine has the characteristics of high molecular weight and high positive charge density, has good flocculation capacity for various components in a slurry system to form fine micro-flocculation, and can rapidly improve the dewatering performance of a wire part of the paper machine. Therefore, the binary retention aid can well improve the retention of pulp fine fiber and papermaking filler and simultaneously improve the water filtering capacity of the net part.
Double-deck fourdrinier machine: feeding the slurry into a net, dehydrating and forming the surface layer slurry and the bottom layer slurry by gravity and vacuum, wherein the dryness is 21-24%;
four-roll three-press type: the wet paper web which is preliminarily dewatered and formed is further dewatered by pressing, wherein the pressing comprises vacuum pressing, blind roller pressing and shoe pressing, the pressing effect is good, and the dryness is 48-52%;
eight sets of forward cylinder drying systems: as a front drying section, drying the paper web by steam to obtain a dryness of 88-92%;
film transfer size press: coating starch sizing material on the surface of the paper web, filling the surface pores of the paper sheet with the starch sizing material to form a starch film, reducing the pore diameter of micropores, thereby reducing the penetration of liquid, endowing the paper with certain strength and water resistance, further improving the printing performance, preventing the hair and powder from falling, and effectively improving the strength and dimensional stability of the finished paper; wherein, the starch sizing material comprises the following components in percentage by weight: 80-95% of corn starch; 1.5-10% of a surface sizing agent; 0.02-0.05% of active amylase; 1.5 to 10 percent of aluminum sulfate. The film transfer sizing machine coats the surface of the paper web with starch sizing material, the starch sizing material fills the surface pores of the paper sheet to form a starch film, and the film is surface sizing, so that the aim of the film transfer sizing machine is achieved: a. the surface of the finished paper is subjected to a pre-finishing effect, and the strength of the finished paper is improved. b. Improving the paper forming performance and further improving the production efficiency. The retention of the surface sizing to the chemicals added is almost 100%. c. In terms of environmental friendliness, surface sizing is advantageous over wet end aids in that it can reduce or eliminate chemicals in the white water, contributing to environmental improvements. The sizing material storage tank requirements of the film transfer sizing machine are as follows: the temperature is 80-90 ℃, the viscosity is 150-300mpa.s, and the solid content is 18-22%.
Three groups of dryer drying systems: as a post-drying section, carrying out steam drying and dehydration on the wet paper web after sizing, wherein the dryness is 90-92%;
and (3) a calender: finishing the dried paper, and improving the flatness, glossiness and tightness of the paper;
and (3) coiling: rolling the web into rolls at the end of the machine for storage and further processing;
rewinding: dividing the coiled large paper roll into small paper rolls according to the size requirement;
film coating machine: coating a layer of stretching film with the thickness of 0.01-0.03mm on the small paper roll after rewinding and slitting to prevent the paper roll from being damaged, dehydrated or rewetted;
and (5) warehousing: and adding the materials into a warehouse for storage and delivering the materials on demand.
According to the production process scheme, the paper forming index can be controlled in the following range (100-150 g of Jianglong regenerated ox card): moisture 8.0-9.0%, ring pressure 6-8N.m/g, COBB value: 30-40g, tightness of 0.67-0.73g/cm < 3 >, air permeability of 300-500cfm, interlayer binding force of 200-300J/m < 2 >, burst value of 1.8-2.2kgf/cm < 2 >, and folding endurance of 10-15 times.
In summary, the wood fiber and regenerated pulp mixed pulp grinding process is different from the common wood fiber single disintegration and pulp grinding treatment mode, the wood fiber/regenerated pulp mixed disintegration and pulp grinding mode is adopted, soft and fine fibers in the regenerated pulp and coarse and hard fibers in the wood fiber are fully mixed and stirred in a vertical hydraulic pulper and then enter a disc mill for pulp grinding, a better pulp grinding effect can be obtained, and meanwhile, the addition of the regenerated pulp protects the grinding disc in the disc mill, delays the service cycle of the grinding disc, prolongs the service life of the grinding disc, reduces the production cost and improves the competitiveness. By mixing and pulping, the pulping effect is improved by more than 10%, the folding resistance of the finished paper is improved by more than 50%, and the air permeability is reduced by more than 10%. Furthermore, freeness of refining under the same parameters compared to general wood fibers alone: the inlet is 800-850 ml, the outlet is 750-800 ml, and the lifting rate is only 6-10%. Freeness of regenerated pulp/wood fiber mixed pulp grinding prepared by the invention: 750-800 ml of inlet, 550-650 ml of outlet, and 15-25% of lifting, namely the lifting proportion of the freeness of the regenerated pulp/wood fiber mixed pulp grinding is larger. In addition, after the wood fiber and the regenerated pulp are mixed and crushed, the wood fiber and the regenerated pulp are subjected to a single high-concentration slag remover, and impurities and crude fiber bundles are extracted by the high-concentration slag remover through high-concentration slag removal treatment, so that the mixed pulp contains fewer impurities, and the slag removal treatment together with the waste paper pulp in the OCC waste paper is not needed, and the fiber loss can be reduced by 10-20%; the wood fiber and the regenerated pulp are only added into the bottom pulp, so that the cleanness and the fineness of the appearance of the surface pulp are ensured, and the quality of the finished product packaging paper manufactured by a later paper machine is better. In addition, the mixed pulp of wood fiber and regenerated pulp is directly added into a long-fiber multi-disc thickener of OCC waste paper wire and then is mixed with pulp at the bottom layer, so that the problems of paper bursting, dark color and the like caused by adding surface pulp are avoided, the paper quality is improved, the wood fiber consumption can be improved by 20 percent due to the improvement of the paper quality, the waste paper pulp consumption is reduced, and the paper making cost can be saved.
It is understood that the foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, but rather is to be accorded the full scope of all such modifications and equivalent structures, features and principles as set forth herein.
Claims (10)
1. A wood fiber and regenerated pulp mixing pulping process is characterized in that: which comprises the following steps:
crushing and deslagging: wood fiber and regenerated pulp were mixed according to 1: (0.5-0.8) is put into a chain plate machine according to the proportion, a vertical hydraulic pulper is utilized for pulping and fluffing, the disintegrating concentration is 5.5-6%, the diluted white water is heated by steam to control the disintegrating temperature to be 65-70 ℃, and meanwhile, liquid alkali with the PH of more than 6.2 is added, so that the wetting and swelling of fibers are ensured, and the fiber shape and toughness are improved; screening and removing impurities and crude fiber bundles in the slurry through a high-concentration slag remover after the slurry is crushed, and enabling the slurry to enter a pre-tapping tank, wherein the slag can be thrown into a waste paper line for recycling;
pulping: selecting a grinding disc suitable for coarse fiber pulping, obtaining regenerated pulp/wood fiber mixed pulping with good pulping effect by controlling high pulping concentration and high reflux quantity, and entering a post-beating tank;
the regenerated pulp/wood fiber in the beating pond is mixed, ground and diluted to the concentration of 2.3-2.8%, then directly added into a long fiber multi-disc thickener of an OCC waste paper line, and further ground and treated with waste paper pulp through long fiber thermal dispersion and a disc grinder, and then added into bottom pulp to form bottom pulp required by a paper machine papermaking process.
2. A process for mixed refining of wood fibers and recycled pulp according to claim 1, wherein: during pulping, the grinding disc is selected from domestic duck green river TF4E48-3555; high refining concentration means refining concentration is: 5% -5.5%; disc grinding power: 500-600 kw, the high reflux amount means the reflux amount is: 4000-5000 l/min; differential pressure: 30-80 kpa; the treatment amount is as follows: 200-250 tons/day.
3. A process for mixed refining of wood fibers and recycled pulp according to claim 1, wherein: the freeness of the regenerated pulp/wood fiber mixed pulp formed after pulp grinding is as follows: 750-800 ml of inlet, 550-650 ml of outlet and 15-25% of freeness; the liquid alkali is added in a proportion of 10 kg/ton of absolute dry pulp.
4. A process for mixed refining of wood fibres and regenerated pulp according to any one of claims 1-3, characterised in that: the OCC waste paper line comprises the following process flows: 100% national waste, a chain plate machine, a rotary drum pulper, a high-concentration slag remover, a coarse screen, a classifying screen, a low-concentration slag remover, a fine screen, a long-fiber multi-disc thickener, thermal dispersion, a pre-beating pulp tank, disc grinding pulping, a post-beating pulp tank and a paper machine feeding system.
5. A process for mixed refining of wood fibers and recycled pulp according to claim 4, wherein: the paper machine papermaking process comprises the following steps: the method comprises the steps of feeding a paper machine, a double-layer fourdrinier, four-roller three-press type squeezing, an eight-group front drying cylinder drying system, a film transfer sizing machine, a three-group drying cylinder drying system, a calender, coiling, rewinding and offline, a film coating machine and warehousing.
6. A process for mixed refining of wood fibers and recycled pulp according to claim 5, wherein: and a paper machine feeding system: the surface sizing agent and the bottom sizing agent which are pulped are respectively further screened and purified, and chemical auxiliary materials which enable the finished paper to have the use characteristics are added in the process;
double-deck fourdrinier machine: feeding the slurry into a net, dehydrating and forming the surface layer slurry and the bottom layer slurry by gravity and vacuum, wherein the dryness is 21-24%;
four-roll three-press type: the wet paper web which is preliminarily dewatered and formed is further dewatered by pressing, wherein the pressing comprises vacuum pressing, blind roller pressing and shoe pressing, and the dryness is 48-52%;
eight sets of forward cylinder drying systems: as a front drying section, drying the paper web by steam to obtain a dryness of 88-92%;
film transfer size press: coating starch sizing material on the surface of the paper web, filling the surface pores of the paper sheet with the starch sizing material, and reducing the pore diameter of micropores so as to reduce the penetration of liquid and endow the paper with certain strength and water resistance;
three groups of dryer drying systems: as a post-drying section, carrying out steam drying and dehydration on the wet paper web after sizing, wherein the dryness is 90-92%;
and (3) a calender: finishing the dried paper, and improving the flatness, glossiness and tightness of the paper;
and (3) coiling: rolling the web into rolls at the end of the machine for storage and further processing;
rewinding: dividing the coiled large paper roll into small paper rolls according to the size requirement;
film coating machine: coating a layer of stretching film with the thickness of 0.01-0.03mm on the small paper roll after rewinding and slitting to prevent the paper roll from being damaged, dehydrated or rewetted;
and (5) warehousing: and adding the materials into a warehouse for storage and delivering the materials on demand.
7. The process for mixed refining of wood fibers and recycled pulp according to claim 6, wherein: the starch sizing material comprises the following components in percentage by weight: 80-95% of corn starch; 1.5-10% of a surface sizing agent; 0.02-0.05% of active amylase; 1.5 to 10 percent of aluminum sulfate.
8. The process for mixed refining of wood fibers and recycled pulp according to claim 6, wherein: the surface layer slurry comprises 100% of OCC waste paper pulp, wherein the raw material ratio of the OCC waste paper pulp is 40-60% of national waste AB grade and 40-60% of national waste CD grade; the bottom layer slurry comprises 12% of regenerated pulp/wood fiber mixed ground pulp and 88% of OCC waste paper pulp, and the raw materials of the OCC waste paper pulp comprise 40-60% of national waste AB grade and 40-60% of national waste CD grade.
9. The process for mixed refining of wood fibers and recycled pulp according to claim 6, wherein: the chemical auxiliary materials comprise a binary retention and drainage aid, wherein the binary retention and drainage aid comprises a powder retention agent Nuoerpol8310 and a liquid retention agent Nuoerform860, the adding amount of the powder retention agent Nuoerpol8310 in surface layer slurry is 0.4-0.6 kg/ton of absolute dry slurry, and the adding amount of the powder retention agent Nuoerpol8310 in bottom layer slurry is 0.8-1.0 kg/ton of absolute dry slurry; the addition amount of the liquid retention aid NuoERform860 in the surface layer slurry is 0.3-0.4 kg/ton of absolute dry slurry, and the addition amount of the liquid retention aid NuoERform860 in the bottom layer slurry is 0.3-0.4 kg/ton of absolute dry slurry.
10. A process for mixed refining of wood fibers and recycled pulp according to claim 9, wherein: the powder retention aid Nuoerpol8310 is a cationic high molecular polyacrylamide polymer particle; the liquid retention aid Nuoerform860 is a water-soluble high molecular polyacrylamide derivative.
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