CN116949857A - High-bulk high-brightness white double-offset paper manufacturing process - Google Patents
High-bulk high-brightness white double-offset paper manufacturing process Download PDFInfo
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- CN116949857A CN116949857A CN202310623968.9A CN202310623968A CN116949857A CN 116949857 A CN116949857 A CN 116949857A CN 202310623968 A CN202310623968 A CN 202310623968A CN 116949857 A CN116949857 A CN 116949857A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 62
- 239000010893 paper waste Substances 0.000 claims abstract description 40
- 238000001035 drying Methods 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 34
- 230000008569 process Effects 0.000 claims abstract description 30
- 229920002472 Starch Polymers 0.000 claims abstract description 24
- 239000000835 fiber Substances 0.000 claims abstract description 24
- 239000008107 starch Substances 0.000 claims abstract description 24
- 235000019698 starch Nutrition 0.000 claims abstract description 24
- 238000003825 pressing Methods 0.000 claims abstract description 20
- 238000003490 calendering Methods 0.000 claims abstract description 16
- 238000004513 sizing Methods 0.000 claims abstract description 16
- 238000004537 pulping Methods 0.000 claims abstract description 15
- 239000002002 slurry Substances 0.000 claims abstract description 11
- 238000012216 screening Methods 0.000 claims abstract description 7
- 102000004357 Transferases Human genes 0.000 claims abstract description 6
- 108090000992 Transferases Proteins 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 239000011268 mixed slurry Substances 0.000 claims abstract description 4
- 238000000465 moulding Methods 0.000 claims abstract description 4
- 239000004576 sand Substances 0.000 claims abstract description 4
- 239000002023 wood Substances 0.000 claims abstract description 4
- 238000004061 bleaching Methods 0.000 claims description 25
- 239000002893 slag Substances 0.000 claims description 19
- 238000005516 engineering process Methods 0.000 claims description 18
- 239000006185 dispersion Substances 0.000 claims description 17
- 238000005188 flotation Methods 0.000 claims description 16
- 230000009467 reduction Effects 0.000 claims description 16
- 238000007639 printing Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 230000003647 oxidation Effects 0.000 claims description 12
- 238000007254 oxidation reaction Methods 0.000 claims description 12
- 239000002761 deinking Substances 0.000 claims description 11
- 230000018044 dehydration Effects 0.000 claims description 9
- 238000006297 dehydration reaction Methods 0.000 claims description 9
- 230000014759 maintenance of location Effects 0.000 claims description 9
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 6
- 239000000853 adhesive Substances 0.000 claims description 6
- 239000003513 alkali Substances 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- 239000000945 filler Substances 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- 239000004115 Sodium Silicate Substances 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims description 3
- 239000000440 bentonite Substances 0.000 claims description 3
- 229910000278 bentonite Inorganic materials 0.000 claims description 3
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 3
- 239000007844 bleaching agent Substances 0.000 claims description 3
- 210000000481 breast Anatomy 0.000 claims description 3
- 125000002091 cationic group Chemical group 0.000 claims description 3
- 238000007865 diluting Methods 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 239000010419 fine particle Substances 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 239000000344 soap Substances 0.000 claims description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 210000002268 wool Anatomy 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims 1
- 238000004804 winding Methods 0.000 abstract 1
- 239000003292 glue Substances 0.000 description 5
- 230000006978 adaptation Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 241000879950 Campostoma anomalum Species 0.000 description 1
- 241000361919 Metaphire sieboldi Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000004438 eyesight Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
-
- 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
-
- 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
- D21B1/325—Defibrating by other means of waste paper de-inking devices
-
- 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
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/02—Working-up waste paper
- D21C5/025—De-inking
-
- 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
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/54—Starch
-
- 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
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
-
- 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
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
- D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
The invention discloses a process for manufacturing high-bulk high-brightness white double-sided offset paper, which comprises the following steps of: pulping: preparing deinked pulp from office waste paper through a pulp line; adopting a pulp line to prepare bleached wood chips into chemi-mechanical pulp with the whiteness of 72+/-1 ℃; homemade or purchased long fiber pulp; preparing slurry: uniformly mixing 50-70% of deinked pulp, 30-40% of chemi-mechanical pulp and 10% of long fiber pulp according to weight percentage to obtain mixed pulp; paper machine papermaking: the mixed slurry is pumped to a flow sand remover and a pressure screen for further screening, and then a headbox is used for sizing the net part, and the slurry is dehydrated and molded on a net part molding net; the wet paper web formed by the dewatering of the wire part is sent to a pressing part for further dewatering and then enters a drying part for drying; the dried paper web is subjected to gelatinization starch pressing sizing treatment on the front surface and the back surface of the paper web by a sizing machine through film transferase, and starch is uniformly formed into a layer of starch film on paper surface; and (3) entering a post-drying part for drying, and then carrying out calendaring, and finally, winding to manufacture finished paper.
Description
Technical field:
the invention relates to the technical field of papermaking, in particular to a process for manufacturing high-bulk high-brightness white double-sided offset paper.
The background technology is as follows:
the white double-adhesive paper has a certain eyesight protection effect, so that most teaching materials or teaching auxiliary materials are manufactured by adopting the white double-adhesive paper.
At present, the white double-adhesive paper of the earthworm brand is red in color and dark in brightness, the bulk of the full-wood pulp double-adhesive paper is low, and the bulk of paper is 1.1-1.2, so that the double-adhesive paper of the quality cannot well meet the use requirement.
In view of this, the present inventors have continuously developed and improved a white double offset paper with high bulk and brightness.
The invention comprises the following steps:
the invention aims to overcome the defects of the prior art and provides a process for manufacturing the white double-offset paper with high bulk and high brightness.
In order to solve the technical problems, the invention adopts the following technical scheme: the process for manufacturing the white double-sided offset paper with high bulk and high brightness comprises the following steps of: pulping: the office waste paper deinking pulping process comprises a rotary drum pulper, a high-concentration slag remover, a front pulp tower, a coarse screen, a heavy slag remover, a front fine screen, a first-stage flotation tank, a rear fine screen, a multi-disc mill, a first-stage heat dispersion, a second-stage flotation tank, a multi-disc mill, a second-stage heat dispersion, an oxidation bleaching tower, a third-stage flotation tank, a low-concentration slag remover, a multi-disc mill, a reduction bleaching pipe and a pulping tower, so as to prepare deinked pulp for later use; preparing bleached wood chips into chemical machine pulp with whiteness of 72+/-1 ℃ by adopting a pulp line for later use; homemade or purchased long fiber pulp for standby; preparing slurry: uniformly mixing 50-70% of deinked pulp, 30-40% of chemi-mechanical pulp and 10% of long fiber pulp according to weight percentage to obtain mixed pulp; paper machine papermaking: the mixed slurry is pumped to a flow sand remover and a pressure screen for further screening, and then a headbox is used for sizing the net part, and the slurry is dehydrated and molded on a net part molding net; the wet paper web formed by the dewatering of the wire part is sent to a pressing part, is further dewatered by the pressing roll, and then enters a drying part for drying; the dried paper web is subjected to gelatinization starch pressing sizing treatment on the front surface and the back surface of the paper web by a sizing machine through film transferase, and starch is uniformly formed into a layer of starch film on paper surface; the paper web is sized and then enters a post-drying part for drying, the dried paper web enters the next section for calendaring, the thickness of the transverse web of the finished paper can be controlled after the hard roll calendaring light line pressure treatment of water-adding circulation heating, and the paper surface is calendered more smoothly, so that the surface smoothness of the paper is improved, and the finished paper is manufactured by reeling after the calendaring treatment.
In the technical scheme, when the drum pulper is used for mildly pulping office waste paper, the temperature of white water is 60-70 ℃, and liquid alkali is added to fully moisten and swell the waste paper raw material in a drum crushing area for mild crushing and gradual crushing into fibers, so that the length of the fibers is reserved to the greatest extent; finally, diluting the mixture to 3-5% by spray water in a screening area, and throwing out tailings along with the centrifugal force of a rotary drum; the high-concentration slag remover and the heavy slag remover are matched to realize the secondary effective removal of heavy impurities in the waste paper pulp; the low-concentration slag remover removes light impurities and fine particles in the paper pulp so as to improve the quality of the paper pulp and the quality of paper products.
In the technical scheme, the whiteness of the waste paper pulp is improved by adopting high-concentration oxidation bleaching and reduction bleaching technologies, wherein the high-concentration oxidation bleaching means that 5-15kg/t of hydrogen peroxide, 3-5kg/t of liquid alkali and 3-5kg/t of sodium silicate are added into 30% pulp in an oxidation bleaching tower to improve the whiteness of the waste paper pulp; the reduction bleaching technology is to add a reduction bleaching agent into a reduction bleaching pipe to improve the whiteness of the pulp under the condition that the temperature of waste paper pulp is 80 ℃ and the concentration is 10-14%.
Furthermore, in the technical scheme, the two-stage thermal dispersion and the three-stage flotation deinking technology are adopted to effectively remove the stickies and the ink points of the waste paper pulp, wherein the two-stage thermal dispersion: the waste paper pulp with the concentration of 28-30% is rubbed by a heat dispersion grinding disc, so that the ink and the sticky matters of the pulp are uniformly dispersed in the pulp; three-stage flotation deinking technology: the waste paper pulp with the concentration of 0.8-1.2% is added with 1-3kg/t of industrial soap, and the printing ink is floated out through a floatation tank device to improve whiteness, so that the stickies and printing ink points of the waste paper deinked pulp are effectively removed, and the appearance quality of the product is ensured.
Further, in the above technical solution, the wire section adopts the wire-clamping former, the wire-clamping former includes a surface wire and a bottom wire which are clamped with each other, the pulp is clamped between the surface wire and the bottom wire for dehydration, wherein the pulp is directly sprayed between the wire section breast roll and the forming roll through the lip plate of the headbox, and dehydration is formed by the extrusion of the surface wire and the bottom wire and the wire section dehydration original.
Furthermore, in the technical scheme, the diameters of warp threads in the surface net and the bottom net are 0.17mm, the diameters of weft threads are 0.27mm, and the smaller the diameters of the weft threads and the warp threads are, the smaller the gaps between the weft threads and the warp threads are, so that the retention rate of the net clamping shaper on fine fibers and fillers is improved.
Furthermore, in the above technical scheme, the paper machine dryer section dry wire is cleaned by a cleaning device, wherein the cleaning device cleans paper wool and stickies on the dry wire by moving back and forth on the dry wire banner under the pressure of vacuum and high-pressure water.
Furthermore, in the technical scheme, the retention and filtration aid and bentonite with the additive number of RetStar 212P in the head box have the functions of improving retention and the effect of improving water drainage of the net part, and meanwhile, 5-10kg/t of cationic starch, 0.2-0.4kg/t of filler pretreatment agent and 5-15kg/t of dry strength agent are added, so that ash content and smoothness index of the product are ensured.
Further, in the technical scheme, after the wire outlet part, the dryness of the wet paper web is 20-22%; the pressing part adopts four rollers and three presses, and the dryness of the pressing part is 50-55%; the drying part adopts 1-7 groups of single hangers, 35 drying cylinders and 3-5% of pre-drying moisture; the post-drying part adopts 8 groups of single hangers, 9 groups of upper and lower cylinders, 12 drying cylinders and post-drying water content of 5-7%; calendering treatment conditions: the line pressure of the calender is 35-75kN/m, and the smoothness is controlled to be more than 40 s.
Furthermore, in the above technical scheme, the indexes of the finished paper are as follows: the whiteness of the hue is 80+/-1%, the L value is more than or equal to 93, the a value is-0.1+/-0.2, and the b value is 4+/-0.3; bulk of the steel sheet: 1.3-1.4; dust index: 0.1 to 0.2mm2 is less than or equal to 50 pieces/m 2 ，0.2-0.5mm 2 Less than or equal to 20/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The surface strength of the finished paper is more than or equal to 1.8m/s; the smoothness index is more than or equal to 30S; transverse folding resistance is more than or equal to 4 times; MD breaking length is more than or equal to 4km; the CD breaking length is more than or equal to 2km.
By adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects: the invention recycles the waste mixed office waste paper to prepare deinked pulp (i.e. regenerated fiber waste paper pulp), greatly improves the utilization rate of fibers, greatly reduces environmental pollution and resource energy consumption, and further promotes the deep application of clean production and circular economy technology in the papermaking industry in China. Furthermore, the invention adopts 50-70% deinked pulp, 30-40% chemical pulp and 10% long fiber pulp to make pulp, compared with the whole wood pulp double-glue paper, the cost of paper per ton is reduced, the use of primary chemical pulp can be greatly reduced, the similar or higher bulk index can be achieved, the whiteness of paper reaches 1.3-1.4, the whiteness of paper is 80+/-1, the L value is above 93, the white double-glue paper prepared by the invention has the advantages of no redness, no darkness, higher bulk, higher brightness and whiter color, and meets different use requirements. The secondary thermal dispersion and tertiary flotation deinking technology effectively removes stickies and ink points of waste paper deinked pulp, and ensures the appearance quality of products. The invention adopts a sizing machine to carry out gelatinization and starch squeezing sizing treatment on the front and back surfaces of the paper web through the film transferase, and forms a layer of starch film on the paper surface uniformly by starch, and the printing adaptation performance of the printing ink can be improved and the quality of the finished paper can be improved due to good combination performance of the printing ink and the starch.
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.
The invention discloses a process for manufacturing high-bulk high-brightness white double-sided offset paper, which is shown in fig. 1 and comprises the following steps of:
pulping: the office waste paper deinking pulping process comprises a rotary drum pulper (3-5% of disintegrating concentration), a high-concentration slag separator (140-160 kpa of slag separator differential pressure control), a front pulp tower, a coarse screen (2-2.5% of pulp inlet concentration control, 1.2mm of screen cylinder gap), a heavy slag separator (140-160 kpa of slag separator differential pressure control), a front fine screen (0.8-1.2% of pulp inlet concentration, 0.2mm of screen cylinder gap), a primary flotation tank (0.8-1.2% of pulp inlet concentration), a rear fine screen (0.8-1.2% of pulp inlet concentration, 0.15mm of screen cylinder gap), a multi-disc mill (10-14% of pulp inlet concentration), a primary thermal dispersion (28-30% of pulp inlet concentration), a secondary thermal dispersion (28-30% of pulp inlet concentration), a three-stage oxidation bleaching tower (10-14% of pulp inlet concentration) and a reduction tube, and a bleaching tube (10-1.2% of pulp inlet concentration control, and a bleaching tube (10-14% of pulp inlet concentration); preparing bleached wood chips into chemical machine pulp with whiteness of 72+/-1 ℃ by adopting a pulp line for later use; homemade or purchased long fiber pulp for standby;
preparing slurry: uniformly mixing 50-70% of deinked pulp, 30-40% of chemi-mechanical pulp and 10% of long fiber pulp according to weight percentage to obtain mixed pulp; the preferable proportion is: the method comprises the steps of (1) mixing 60% deinked pulp, 30% chemi-mechanical pulp and 10% long fiber pulp according to weight percentage;
paper machine papermaking: the mixed slurry is pumped to a flow sand remover and a pressure screen for further screening, and then a headbox is used for sizing the net part, and the slurry is dehydrated and molded on a net part molding net; the wet paper web formed by the dewatering of the wire part is sent to a pressing part, is further dewatered by the pressing roll, and then enters a drying part for drying; the dried paper web is subjected to pasting starch pressing and sizing treatment on the front surface and the back surface of the paper web by a film transferase through a sizing machine, starch is uniformly formed into a layer of starch film on paper surface, and the printing adaptation performance of the printing ink can be improved due to good combination performance of the printing ink and the starch; the paper web is sized and then enters a post-drying part for drying, the dried paper web enters the next section for calendaring, the thickness of the transverse web of the finished paper can be controlled after the hard roll calendaring light line pressure treatment of water-adding circulation heating, and the paper surface is calendered more smoothly, so that the surface smoothness of the paper is improved, and the finished paper is manufactured by reeling after the calendaring treatment.
The indexes of the finished paper prepared by the process are as follows: the whiteness of the hue is 80+/-1%, the L value is more than or equal to 93, the a value is-0.1+/-0.2, and the b value is 4+/-0.3; bulk of the steel sheet: 1.3-1.4; dust index: 0.1-0.2 mm 2 Less than or equal to 50/m 2 ，0.2-0.5mm 2 Less than or equal to 20/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The surface strength of the finished paper is more than or equal to 1.8m/s; the smoothness index is more than or equal to 30S; transverse folding resistance is more than or equal to 4 times; MD breaking length is more than or equal to 4km; the CD breaking length is more than or equal to 2km, so that the white double-glue paper prepared by the invention has the advantages of no reddening color, no darkness in brightness, higher bulk, higher brightness and whiter color, so as to meet different use requirements
In the process of pulping deinked pulp, when the drum pulper is used for mildly pulping office waste paper, the temperature of white water is 60-70 ℃, and liquid alkali is added to fully wet and expand the waste paper raw material in a drum crushing area for mild crushing and gradual crushing into fibers, so that the length of the fibers is reserved to the greatest extent; finally, diluting the mixture to 3-5% by spray water in a screening area, and throwing out tailings along with the centrifugal force of a rotary drum; the high-concentration slag remover and the heavy slag remover are matched to realize the secondary effective removal of heavy impurities in the waste paper pulp; the low-concentration slag remover removes light impurities and fine particles in the paper pulp so as to improve the quality of the paper pulp and the quality of paper products.
In the pulping process of deinked pulp, the whiteness of waste paper pulp is improved by adopting high-concentration oxidation bleaching and reduction bleaching technology, so that the whiteness of finished paper is improved, wherein the high-concentration oxidation bleaching means that 5-15kg/t of hydrogen peroxide, 3-5kg/t of liquid alkali and 3-5kg/t of sodium silicate are added into pulp with the concentration of 30% in an oxidation bleaching tower to improve the whiteness of the waste paper pulp; the reduction bleaching technology is to add a reduction bleaching agent into a reduction bleaching pipe to improve the whiteness of the pulp under the condition that the temperature of waste paper pulp is 80 ℃ and the concentration is 10-14%.
In the pulping process of deinked pulp, the stickies and ink points of the waste paper pulp are effectively removed by adopting a secondary thermal dispersion and tertiary flotation deinking technology, wherein the secondary thermal dispersion is as follows: the waste paper pulp with the concentration of 28-30% is rubbed by a heat dispersion grinding disc, so that the ink and the sticky matters of the pulp are uniformly dispersed in the pulp; three-stage flotation deinking technology: adding 1-3kg/t industrial soap into waste paper pulp with the concentration of 0.8-1.2%, floating out the printing ink by a flotation tank device to improve the whiteness, further improving the whiteness of finished paper, effectively removing stickies and printing ink points of the waste paper deinked pulp, and ensuring the appearance quality of the product.
In the paper making process of the paper machine, a net part adopts a net clamping shaper, the net clamping shaper comprises a surface net and a bottom net which are clamped with each other, and pulp is clamped between the surface net and the bottom net for dehydration, wherein the pulp is directly sprayed between a breast roll and a forming roll of the net part through a lip plate of a head box, dehydration is formed through extrusion of the surface net and the bottom net and a dehydration original of the net part, and the dryness of a wet paper web is 20-22%.
In the prior art, the diameters of warp threads in the surface net and the bottom net are 0.21mm, the diameters of weft threads are 0.30mm, the diameters of warp threads in the surface net and the bottom net are 0.17mm, and the diameters of warp threads in the surface net and the bottom net are reduced by 19%; the diameter of the weft is 0.27mm, the reduction is 11%, and the smaller the diameters of the weft and the warp are, the smaller the gap between the weft and the warp is, so that the retention rate of the net clamping shaper on fine fibers and fillers is improved.
The paper machine dryer section dry wire is cleaned by a cleaning device, wherein the cleaning device cleans paper wool and sticky matters on the dry wire by moving back and forth on a dry wire banner under the pressure of vacuum and high-pressure water, so that the stable operation and the paper forming quality of the paper machine are ensured.
The retention and filtration aid and bentonite with the additive number of RetStar 212P in the head box have the functions of improving retention and the effect of improving the water filtering of the net part, and meanwhile, 5-10kg/t of cationic starch, 0.2-0.4kg/t of filler pretreatment agent and 5-15kg/t of dry strength agent are added, so that the ash content and smoothness index of the product are ensured.
After the wire outlet part, the dryness of the wet paper web is 20-22%; the pressing part adopts four rollers and three presses, and the dryness of the pressing part is 50-55%; the drying part adopts 1-7 groups of single hangers, 35 drying cylinders and 3-5% of pre-drying moisture; the post-drying part adopts 8 groups of single hangers, 9 groups of upper and lower cylinders, 12 drying cylinders and post-drying water content of 5-7%; calendering treatment conditions: the line pressure of the calender is 35-75kN/m, and the smoothness is controlled to be more than 40 s.
By utilizing the shoe pressing technology of the pressing part, the paper is separated from the paper as far as possible under the action of 1100-1300kN/m hydraulic pressure of the shoe roller (the shoe sleeve is arranged outside) and the central stone roller, so that the dryness of the paper web pressing part reaches more than 52%.
In summary, the deinked pulp (i.e. regenerated fiber waste paper pulp) is prepared by recycling the waste mixed office waste paper, so that the fiber utilization rate is greatly improved, the environmental pollution and the resource energy consumption are greatly reduced, and the deep application of clean production and circular economy technology in the papermaking industry in China is further promoted. Furthermore, the invention adopts 50-70% deinked pulp, 30-40% chemical pulp and 10% long fiber pulp to make pulp, compared with the whole wood pulp double-glue paper, the cost of paper per ton is reduced, the use of primary chemical pulp can be greatly reduced, the similar or higher bulk index can be achieved, the whiteness of paper reaches 1.3-1.4, the whiteness of paper is 80+/-1, the L value is above 93, the white double-glue paper prepared by the invention has the advantages of no redness, no darkness, higher bulk, higher brightness and whiter color, and meets different use requirements. The secondary thermal dispersion and tertiary flotation deinking technology effectively removes stickies and ink points of waste paper deinked pulp, and ensures the appearance quality of products. The invention adopts a sizing machine to carry out gelatinization and starch squeezing sizing treatment on the front and back surfaces of the paper web through the film transferase, and forms a layer of starch film on the paper surface uniformly by starch, and the printing adaptation performance of the printing ink can be improved and the quality of the finished paper can be improved due to good combination performance of the printing ink and the starch.
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. The process for manufacturing the white double-sided offset paper with high bulk and high brightness comprises the following steps:
pulping: the office waste paper deinking pulping process comprises a rotary drum pulper, a high-concentration slag remover, a front pulp tower, a coarse screen, a heavy slag remover, a front fine screen, a first-stage flotation tank, a rear fine screen, a multi-disc mill, a first-stage heat dispersion, a second-stage flotation tank, a multi-disc mill, a second-stage heat dispersion, an oxidation bleaching tower, a third-stage flotation tank, a low-concentration slag remover, a multi-disc mill, a reduction bleaching pipe and a pulping tower, so as to prepare deinked pulp for later use; preparing bleached wood chips into chemical machine pulp with whiteness of 72+/-1 ℃ by adopting a pulp line for later use; homemade or purchased long fiber pulp for standby;
preparing slurry: uniformly mixing 50-70% of deinked pulp, 30-40% of chemi-mechanical pulp and 10% of long fiber pulp according to weight percentage to obtain mixed pulp;
paper machine papermaking: the mixed slurry is pumped to a flow sand remover and a pressure screen for further screening, and then a headbox is used for sizing the net part, and the slurry is dehydrated and molded on a net part molding net; the wet paper web formed by the dewatering of the wire part is sent to a pressing part, is further dewatered by the pressing roll, and then enters a drying part for drying; the dried paper web is subjected to gelatinization starch pressing sizing treatment on the front surface and the back surface of the paper web by a sizing machine through film transferase, and starch is uniformly formed into a layer of starch film on paper surface; the paper web is sized and then enters a post-drying part for drying, the dried paper web enters the next section for calendaring, the thickness of the transverse web of the finished paper can be controlled after the hard roll calendaring light line pressure treatment of water-adding circulation heating, and the paper surface is calendered more smoothly, so that the surface smoothness of the paper is improved, and the finished paper is manufactured by reeling after the calendaring treatment.
2. The process for manufacturing the high-bulk high-brightness white double-sided offset paper according to claim 1, which is characterized in that: when the drum pulper is used for mildly pulping office waste paper, the temperature of white water is 60-70 ℃, and liquid alkali is added to fully wet and expand the waste paper raw material in a drum crushing area for mild crushing and gradual crushing into fibers, so that the length of the fibers is reserved to the greatest extent; finally, diluting the mixture to 3-5% by spray water in a screening area, and throwing out tailings along with the centrifugal force of a rotary drum; the high-concentration slag remover and the heavy slag remover are matched to realize the secondary effective removal of heavy impurities in the waste paper pulp; the low-concentration slag remover removes light impurities and fine particles in the paper pulp so as to improve the quality of the paper pulp and the quality of paper products.
3. The process for manufacturing the high-bulk high-brightness white double-sided offset paper according to claim 1, which is characterized in that: the whiteness of the waste paper pulp is improved by adopting high-concentration oxidation bleaching and reduction bleaching technology, wherein the high-concentration oxidation bleaching means that 5-15kg/t of hydrogen peroxide, 3-5kg/t of liquid alkali and 3-5kg/t of sodium silicate are added into 30% concentration slurry in an oxidation bleaching tower to improve the whiteness of the waste paper pulp; the reduction bleaching technology is to add a reduction bleaching agent into a reduction bleaching pipe to improve the whiteness of the pulp under the condition that the temperature of waste paper pulp is 80 ℃ and the concentration is 10-14%.
4. The process for making the high-bulk high-brightness white double-sided offset paper according to claim 3, wherein the process comprises the following steps of: the adhesive and the ink points of the waste paper pulp are effectively removed by adopting a secondary heat dispersion and a tertiary flotation deinking technology, wherein the secondary heat dispersion is as follows: the waste paper pulp with the concentration of 28-30% is rubbed by a heat dispersion grinding disc, so that the ink and the sticky matters of the pulp are uniformly dispersed in the pulp; three-stage flotation deinking technology: the waste paper pulp with the concentration of 0.8-1.2% is added with 1-3kg/t of industrial soap, and the printing ink is floated out through a floatation tank device to improve whiteness, so that the stickies and printing ink points of the waste paper deinked pulp are effectively removed, and the appearance quality of the product is ensured.
5. The process for producing the high-bulk high-brightness white double-sided offset paper according to any one of claims 1 to 4, wherein the process is characterized in that: the net part adopts a net clamping shaper, the net clamping shaper comprises a surface net and a bottom net which are clamped with each other, and slurry is clamped between the surface net and the bottom net for dehydration, wherein the slurry is directly sprayed between a breast roll and a forming roll of the net part through a lip plate of a head box, and dehydration is formed through extrusion of the surface net and the bottom net and a dehydration original of the net part.
6. The process for manufacturing the high-bulk high-brightness white double-sided offset paper according to claim 5, wherein the process comprises the following steps of: the diameters of warp threads in the surface net and the bottom net are 0.17mm, the diameters of weft threads are 0.27mm, and the smaller the diameters of the weft threads and the warp threads are, the smaller the gaps between the weft threads and the warp threads are, so that the retention rate of the net clamping shaper on fine fibers and fillers is improved.
7. The process for producing the high-bulk high-brightness white double-sided offset paper according to any one of claims 1 to 4, wherein the process is characterized in that: the paper machine dryer section dry wire is cleaned by a cleaning device, wherein the cleaning device cleans paper wool and sticky matters on the dry wire by moving back and forth on the dry wire banner through vacuum and high-pressure water pressure.
8. The process for producing the high-bulk high-brightness white double-sided offset paper according to any one of claims 1 to 4, wherein the process is characterized in that: the retention and filtration aid and bentonite with the additive number of RetStar 212P in the head box have the functions of improving retention and the effect of improving the water filtering of the net part, and meanwhile, 5-10kg/t of cationic starch, 0.2-0.4kg/t of filler pretreatment agent and 5-15kg/t of dry strength agent are added, so that the ash content and smoothness index of the product are ensured.
9. The process for producing the high-bulk high-brightness white double-sided offset paper according to any one of claims 1 to 4, wherein the process is characterized in that: after the wire outlet part, the dryness of the wet paper web is 20-22%; the pressing part adopts four rollers and three presses, and the dryness of the pressing part is 50-55%; the drying part adopts 1-7 groups of single hangers, 35 drying cylinders and 3-5% of pre-drying moisture; the post-drying part adopts 8 groups of single hangers, 9 groups of upper and lower cylinders, 12 drying cylinders and post-drying water content of 5-7%; calendering treatment conditions: the line pressure of the calender is 35-75kN/m, and the smoothness is controlled to be more than 40 s.
10. The process for making the high bulk and high brightness white double offset paper according to claim 9, wherein the process comprises the following steps: the indexes of the finished paper are as follows: the whiteness of the hue is 80+/-1%, the L value is more than or equal to 93, the a value is-0.1+/-0.2, and the b value is 4+/-0.3; bulk of the steel sheet: 1.3-1.4; dust index: 0.1-0.2 mm 2 Less than or equal to 50/m 2 ，0.2-0.5mm 2 Less than or equal to 20/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The surface strength of the finished paper is more than or equal to 1.8m/s; the smoothness index is more than or equal to 30S; transverse folding resistance is more than or equal to 4 times; MD breaking length is more than or equal to 4km; the CD breaking length is more than or equal to 2km.
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| CN1584205A (en) * | 2004-05-28 | 2005-02-23 | 岳阳纸业股份有限公司 | Special pigment finishing offset paper and producing method thereof |
| CN101760988A (en) * | 2008-11-28 | 2010-06-30 | 山东福荫造纸环保科技有限公司 | Mixed pulp material and cultural paper prepared from the same |
| CN102677532A (en) * | 2012-05-28 | 2012-09-19 | 东莞天龙纸业有限公司 | Process for preparing cultural paper by utilizing full-recovered pulp |
| CN105735035A (en) * | 2016-03-02 | 2016-07-06 | 福建希源纸业有限公司 | Method for producing base wallpaper from waste paper deinking pulp |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1584205A (en) * | 2004-05-28 | 2005-02-23 | 岳阳纸业股份有限公司 | Special pigment finishing offset paper and producing method thereof |
| CN101760988A (en) * | 2008-11-28 | 2010-06-30 | 山东福荫造纸环保科技有限公司 | Mixed pulp material and cultural paper prepared from the same |
| CN102677532A (en) * | 2012-05-28 | 2012-09-19 | 东莞天龙纸业有限公司 | Process for preparing cultural paper by utilizing full-recovered pulp |
| CN105735035A (en) * | 2016-03-02 | 2016-07-06 | 福建希源纸业有限公司 | Method for producing base wallpaper from waste paper deinking pulp |
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