CN113308944B - Regenerated craft paper and preparation method thereof - Google Patents
Regenerated craft paper and preparation method thereof Download PDFInfo
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- CN113308944B CN113308944B CN202110601106.7A CN202110601106A CN113308944B CN 113308944 B CN113308944 B CN 113308944B CN 202110601106 A CN202110601106 A CN 202110601106A CN 113308944 B CN113308944 B CN 113308944B
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Images
Classifications
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/30—Multi-ply
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/06—Layered products comprising a layer of paper or cardboard specially treated, e.g. surfaced, parchmentised
-
- 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
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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
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
-
- 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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Abstract
The invention relates to a regenerated craft paper, which comprises a surface layer, a core layer and a bottom layer, wherein the regenerated craft paper is prepared from the following pulp in percentage by weight: 80-95% of national waste OCC pulp and 5-20% of wood pulp; the raw materials of the national OCC pulp are national OCC waste paper, and the national OCC waste paper comprises 70-80% of national waste A-grade paper and 20-30% of national waste BC-grade paper; the wood pulp comprises one or more of unbleached softwood pulp, unbleached eucalyptus pulp and reel substituted wood pulp in any proportion; the ration of the regenerated craft paper is 95-210 g/cm 2 . The invention also relates to a preparation method of the regenerated craft paper, which does not use American waste OCC and European waste OCC, uses national waste OCC as main raw materials, optimizes the wood pulp proportion, and optimizes the pulping process of the national waste OCC on the basis, thus producing 95-210 g/cm 2 A2 ox card has strong paper strength and stable quality, solves the problem that after national waste paper forbidden to be imported, 95-210 g/cm with the national waste OCC as the main raw material is difficult to produce 2 A2 production problem of cattle card.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to a regenerated craft paper and a preparation method thereof.
Background
The regenerated kraft paper is generally produced by pulping and reproducing the whole waste paper or the main raw material of the regenerated kraft paper, has relatively low raw material cost and production energy consumption, and has obvious advantages in the field of packaging paper.
Sources of waste paper mainly include domestic waste paper and imported waste paper. With the implementation of the national environmental protection policy deepened, the country began to completely prohibit import of waste paper, and domestic waste paper would certainly become the main raw material for waste paper papermaking. However, compared with the American waste and European waste, the domestic waste has the characteristics of short fiber, more recycling times and low strength. Under the shortage of raw materials and the high market weight of continuously advancing prices due to poor quality of national waste, the prior process technology cannot meet the current raw material conditions, and great difficulty is brought to making high-performance regenerated kraft paper.
Therefore, there is a need to develop a new method for preparing regenerated craft paper, which uses waste OCC as main raw material, and has high production strength and good quality.
Disclosure of Invention
In view of the above technical problems, it is desirable to provide a regenerated craft paper and a preparation method thereof, so as to solve the production problem that it is difficult to produce A2 regenerated craft paper with the same quality by using national waste OCC as a main raw material after national impossibility of waste paper import.
In order to achieve the above object, a first aspect of the present invention provides a recycled craft paper, which includes a surface layer, a core layer and a bottom layer; the regenerated craft paper is prepared from the following pulp in percentage by weight: 80-90% of national waste OCC pulp and 10-20% of wood pulp;
the raw material of the national OCC pulp is domestic OCC waste paper, and the domestic OCC waste paper comprises 70-80% of national waste A-grade paper and 20-30% of national waste BC-grade paper;
the wood pulp comprises one or more of unbleached softwood pulp, unbleached eucalyptus pulp and reel substituted wood pulp in any proportion;
the ration of the regenerated craft paper is 95-210 g/cm 2 。
The second aspect of the present invention provides a method for preparing a regenerated craft paper, wherein the regenerated craft paper is the regenerated craft paper according to the first aspect of the present invention, and the method comprises the following steps:
s10, preparing waste OCC slurry:
s101: pulp bags with the formula amount and/or domestic OCC waste paper are subjected to feeding, crushing, high-concentration deslagging and coarse screening, and then fiber classification and sorting are carried out to form domestic OCC long fibers, domestic OCC medium fibers and domestic OCC short fibers;
s102: carrying out heavy deslagging, fine screening and multi-disc concentration on the national waste OCC long fiber, and then selectively carrying out disc grinding and pulping to obtain national waste OCC long fiber pulp, and delivering the national waste OCC long fiber pulp to a mixed pulp tank for pulp preparation;
S103: carrying out heavy deslagging, light deslagging, multi-disc concentration and heat dispersion on the fiber in the national waste OCC to obtain fiber pulp in the national waste OCC, and delivering the fiber pulp to a mixed pulp tank for pulp preparation;
s104: the national waste OCC short fiber is subjected to heavy deslagging and multi-disc concentration to obtain national waste OCC short fiber pulp, and the national waste OCC short fiber pulp is sent to a mixed pulp tank for pulp preparation;
s20, preparing wood pulp: pulp is obtained by feeding, crushing, high-concentration deslagging and disc grinding pulping the wood pulp bags with the formula amount, and the wood pulp bags are sent to a mixed pulp tank for pulp preparation;
s30, preparing recycled pulp of the broke and the cushion layer: recovering the damaged paper and the cushion layer to prepare slurry, and delivering the slurry to a mixed slurry pool for slurry preparation;
s40, slurry preparation: preparing slurry according to the formula to obtain surface layer slurry, core layer slurry and bottom layer slurry;
s50, paper making: and (3) enabling the surface layer slurry, the core layer slurry and the bottom layer slurry to flow into a headbox through a slurry filling pump and a pressure screen respectively, then sending the mixture into a net part for net part dehydration forming, and carrying out press dehydration through a press part, drying at a front drying part, surface sizing, drying at a rear drying part, calendaring, coiling and rewinding to prepare the regenerated kraft liner board.
Compared with the prior art, the technical scheme provides a regenerated craft paper, which comprises a surface layer, a core layer and a bottom layer, wherein the regenerated craft paper is prepared from the following pulp in percentage by weight: 80-90% of national waste OCC pulp and 10-20% of wood pulp; the raw material of the national OCC pulp is domestic OCC waste paper, and the domestic OCC waste paper comprises 70-80% of national waste A-grade paper and 20-30% of national waste BC-grade paper; the wood pulp comprises one or more of unbleached softwood pulp, unbleached eucalyptus pulp and reel substituted wood pulp in any proportion; the ration of the regenerated craft paper is 95-210 g/cm 2 . The technical scheme also provides a preparation method of the regenerated craft paper. In the preparation method of the invention, the American waste and European waste are not used, the A grade and the BC grade of national waste are used as main raw materials, the wood pulp proportion is optimized, and the OCC pulping process of the national waste is optimized on the basis, thus 95-210 g/cm can be produced 2 A2 ox card has strong paper strength and stable quality, solves the problem that after national waste paper forbidden to be imported, 95-210 g/cm with the national waste OCC as the main raw material is difficult to produce 2 A2 production problem of cattle card. The used recycled and reused domestic OCC waste paper accounts for about 95% of all raw materials, meets the requirements of green recycling economic production, has good social benefit and economic benefit, and can be popularized and applied in the field.
Drawings
Fig. 1 is a flow chart of pulping waste OCC in a method for preparing a regenerated craft paper according to an embodiment;
fig. 2 is a flow chart of pulping wood pulp in a method for preparing a regenerated kraft according to an embodiment;
fig. 3 is a working flow chart of a paper machine in the method for preparing the regenerated craft paper according to the embodiment.
Detailed Description
In order to describe the technical content, constructional features, achieved objects and effects of the technical solution in detail, the following description is made in detail with reference to specific embodiments. The embodiment of the invention is implemented on the premise of the technical scheme of the invention, and a detailed implementation mode and a specific operation process are provided, but the protection scope of the invention is not limited to the following embodiment.
After the American waste OCC and European waste OCC are canceled from import, in the prior art, 100 percent of national waste OCC is used for manufacturing, and under the conditions of normal pulp preparation, normal paper machine manufacturing process and normal chemical auxiliary material addition, the burst index of the produced kraft liner is 1.7-2.0 kpa.g/m 2 The folding endurance is 8-13, the index requirement of the A2 kraft paper cannot be met, and in fact, the excessive starch, dry strength agent and other paper reinforcing auxiliary agents cannot be used, and the burst index is more than or equal to 2.4kpa.g/m 2 The folding endurance is more than or equal to 30 times of paper strength index requirements.
In order to solve the problems in the prior art, the invention provides a regenerated kraft liner and a preparation method thereof, and the produced regenerated kraft liner has strong paper and stable quality, and meets the requirements of 95-210 g/cm 2 Quality index of A2 ox card.
First, a regenerated craft paper according to the first aspect of the present invention will be described in detail.
The regenerated craft paper comprises a surface layer, a core layer and a bottom layer; the regenerated craft paper is prepared from the following pulp in percentage by weight: 80-95% of national waste OCC pulp and 5-20% of wood pulp;
the raw material of the national OCC pulp is domestic OCC waste paper, and the domestic OCC waste paper comprises 70-80% of national waste A-grade paper and 20-30% of national waste BC-grade paper;
The wood pulp comprises one or more of unbleached softwood pulp, unbleached eucalyptus pulp and reel substituted wood pulp in any proportion;
the ration of the regenerated craft paper is 95-210 g/cm 2 。
As a further embodiment of the invention, in the regenerated kraft liner board according to the first aspect of the invention, the wood pulp comprises 10% -20% of unbleached eucalyptus pulp and 80% -90% of reel-up wood pulp, or
The wood pulp comprises 10 percent of unbleached softwood pulp, 20 to 50 percent of unbleached eucalyptus pulp and 40 to 70 percent of reel substituted wood pulp.
As a further embodiment of the present invention, in the regenerated craft paper according to the first aspect of the present invention, the ration of the regenerated craft paper is 95-130 g/cm 2 The wood pulp is unbleached softwood pulp or unbleached eucalyptus pulp;
the slurry of the surface layer comprises 35% -50% of wood pulp and 50% -65% of waste OCC medium fiber slurry;
the slurry of the core layer comprises 40% -50% of national waste OCC long fiber slurry, 40% -50% of national waste OCC short fiber slurry and 10% -20% of recovered slurry of damaged paper and a cushion layer;
the bottom layer slurry comprises 40% -50% of waste OCC long fiber slurry, 40% -50% of waste OCC short fiber slurry and 10% -20% of recovered slurry of damaged paper and cushion layer.
As a further embodiment of the present invention, in the regenerated craft paper according to the first aspect of the present invention, the ration of the regenerated craft paper is 95-130 g/cm 2 The wood pulp is reel-substituted wood pulp, or the wood pulp comprises 10% -20% of unbleached eucalyptus pulp and 80% -90% of reel-substituted wood pulp, or the wood pulp comprises 10% of unbleached softwood pulp, 20% -50% of unbleached eucalyptus pulp and 40% -70% of reel-substituted wood pulp;
the slurry of the surface layer comprises 25% -35% of first wood pulp and 65% -75% of waste OCC medium fibers, wherein the first wood pulp comprises 40% -50% of components of reel-up wood pulp in the wood pulp and other types of slurry components remained in the wood pulp;
the slurry of the core layer comprises 40% -50% of national waste OCC long fiber slurry, 40% -50% of national waste OCC short fiber slurry and 10% -20% of recovered slurry of damaged paper and a cushion layer;
the bottom layer slurry comprises 40% -50% of national waste OCC long fiber slurry, 40% -50% of national waste OCC short fiber slurry and 10% -20% of recovered slurry of damaged paper and cushion layer;
the raw materials of the national waste OCC long fiber pulp, the national waste OCC medium fiber pulp and the national waste OCC short fiber pulp comprise domestic OCC waste paper and 50% -60% of reel substituted wood pulp in wood pulp.
The term "other types of pulp components remaining in the wood pulp" as referred to in the above-described embodiments means unbleached eucalyptus pulp and/or unbleached softwood pulp in the wood pulp in addition to the rolled wood pulp.
In addition, the recovered pulp of the damaged paper and the cushion layer is a half-intermediate product generated in the production process of the regenerated craft paper, and is reused in pulp preparation after recovery and pulping. The damaged paper refers to wet damaged paper and dry damaged paper generated in the production process of net-feeding and papermaking by the sizing agent. Wet broke refers to cut paper at the wire section of the machine; the dry broke comprises mother roll rewinding edge paper, mother roll residual roll base paper, waste paper generated by paper breakage and unqualified product rewashing paper. And re-dispersing the wet broke and the dry broke to obtain the broke recovery pulp for pulp blending and recycling of the core layer and the bottom layer. The cushion recovery pulp refers to the surplus white water generated in the paper making process of the paper machine, and the recovery pulp is obtained by processing by using a white water recovery multi-disc machine. The concrete treatment process of the cushion recovery slurry comprises the following steps: adding part of OCC pulp (usually OCC long fiber pulp to improve water filtering performance) into white water, forming a cushion filter cake on a multi-disc fan blade, removing water through the filter cake under the vacuum effect generated by a vacuum water leg of a white water recycling multi-disc machine, and most of fine fibers in the white water are trapped by the filter cake to be recycled, wherein the filter cake is pulp obtained by stripping the filter cake by using stripping spray water, namely cushion recycling pulp.
As a further embodiment of the present invention, in the regenerated craft paper according to the first aspect of the present invention, the basis weight of the regenerated craft paper is 140-210 g/cm 2 ；
The sizing agent of the surface layer comprises 30% -90% of wood pulp and 10% -70% of waste OCC medium fiber sizing agent;
the slurry of the core layer comprises 40% -50% of national waste OCC long fiber slurry, 40% -50% of national waste OCC short fiber slurry and 10% -20% of recovered slurry of damaged paper and a cushion layer;
the bottom layer slurry comprises 40% -50% of waste OCC long fiber slurry, 40% -50% of waste OCC short fiber slurry and 10% -20% of recovered slurry of damaged paper and cushion layer.
As a further embodiment of the present invention, in a regenerated kraft according to the first aspect of the invention, the surface layer slurry includes 30% -60% wood pulp and 40% -70% medium-fiber pulp of waste OCC.
As a further embodiment of the present invention, in the regenerated craft paper according to the first aspect of the present invention, the ration of the regenerated craft paper is 95-130 g/cm 2 The burst index of the regenerated craft paper is 2.45-2.50 kpa.g/m 2 The folding endurance is 28-35 times, the hue value L is 57-59, a is 8.0-8.5, b is 21.0-21.5, and the quality index requirement of the A2 craft paper is completely met.
As a further embodiment of the present invention, in the regenerated craft paper according to the first aspect of the present invention, the basis weight of the regenerated craft paper is 140-210 g/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The burst index of the regenerated craft paper is 2.45-2.50 kpa.g/m 2 The folding endurance is 40-50 times, the hue value L is 57-59, a is 8.0-8.5, b is 21.0-21.5, and the quality index requirement of the A2 craft paper is completely met.
Next, a method for preparing a regenerated craft paper according to the second aspect of the present invention is described in detail, where the regenerated craft paper is a regenerated craft paper according to the first aspect of the present invention.
The preparation method of the regenerated craft paper of the second aspect of the invention comprises the following steps:
s10, preparing waste OCC slurry:
s101: pulp bags with the formula amount and/or domestic OCC waste paper are subjected to feeding, crushing, high-concentration deslagging and coarse screening, and then fiber classification and sorting are carried out to form domestic OCC long fibers, domestic OCC medium fibers and domestic OCC short fibers;
s102: carrying out heavy deslagging, fine screening and multi-disc concentration on the national waste OCC long fiber, and then selectively carrying out disc grinding and pulping to obtain national waste OCC long fiber pulp, and delivering the national waste OCC long fiber pulp to a mixed pulp tank for pulp preparation;
s103: carrying out heavy deslagging, light deslagging, multi-disc concentration and heat dispersion on the fiber in the national waste OCC to obtain fiber pulp in the national waste OCC, and delivering the fiber pulp to a mixed pulp tank for pulp preparation;
S104: the national waste OCC short fiber is subjected to heavy deslagging and multi-disc concentration to obtain national waste OCC short fiber pulp, and the national waste OCC short fiber pulp is sent to a mixed pulp tank for pulp preparation;
s20, preparing wood pulp: pulp is obtained by feeding, crushing, high-concentration deslagging and disc grinding pulping the wood pulp bags with the formula amount, and the wood pulp bags are sent to a mixed pulp tank for pulp preparation; the step S20 is selectively carried out;
s30, preparing recycled pulp of the broke and the cushion layer: recovering the damaged paper and the cushion layer to prepare slurry, and delivering the slurry to a mixed slurry pool for slurry preparation;
s40, slurry preparation: preparing slurry according to the formula to obtain surface layer slurry, core layer slurry and bottom layer slurry;
s50, paper making: and (3) enabling the surface layer slurry, the core layer slurry and the bottom layer slurry to flow into a headbox through a slurry filling pump and a pressure screen respectively, then sending the mixture into a net part for net part dehydration forming, and carrying out press dehydration through a press part, drying at a front drying part, surface sizing, drying at a rear drying part, calendaring, coiling and rewinding to prepare the regenerated kraft liner board.
In the method for preparing the regenerated craft paper of the present invention, the step of "disc milling and beating" in S102 is selectively performed, and the step of "preparing wood pulp" in S20 is also selectively performed. When only reel-up wood pulp (i.e., 100% reel-up wood pulp) is used in the preparation method, or wood pulp comprising 20% unbleached eucalyptus pulp and 80% reel-up wood pulp is used, there are two schemes:
1. 50% -60% of the components of the reel wood pulp replacing pulp package in the wood pulp are fed into an OCC pulper to be mixed with domestic OCC waste paper for preparing long fiber, medium fiber and short fiber pulp; the balance of 40% -50% of the reel substituted wood pulp in the wood pulp (the added unbleached eucalyptus pulp) is used for surface layer pulp preparation. At this time, the step S20 of "preparation of wood pulp" should be included to prepare the balance 40% -50% of the components of the rolled substituted wood pulp (and the added unbleached eucalyptus pulp) for surface layer pulp formulation. In addition, compared with the non-pulping, the breaking strength of the paper subjected to the pulping of the national waste OCC is limited to be improved, and the folding endurance of the finished paper is reduced by 10% -20%, so that the step of disc grinding and pulping in S102 is not needed.
2. 100% of the reel wood pulp is fully fed into an OCC pulper to be mixed with domestic OCC waste paper to prepare long fiber, medium fiber and short fiber pulp. At this time, the step S20 of preparing the wood pulp is not needed (comprising the step of pulping the wood pulp by disc grinding is not needed); the step of 'disc grinding and pulping' in S102 is necessary, and fully disc grinding and pulping are carried out on the obtained waste OCC long fibers after mixing and pulping of reel wood pulp and domestic OCC waste paper and classification, so that the degree of fibrillation of the long fibers is improved, and long fiber refined pulp is obtained. Wherein, the disc grinding beating is carried out by a double-disc grinding beating machine.
The technical scheme provides a preparation method of the regenerated craft paper, which has the following beneficial effects:
(1) In the preparation method of the invention, the waste OCC short fiber has less impurities at the wax point after the low-concentration heavy slag removal treatment, and meets the quality requirements of short fiber pulp preparation and papermaking. Therefore, in the preparation method, through the steps of stopping the first-stage and second-stage light reverse slag removers of the short fibers and clarifying the white water, the actual power of the equipment can be reduced by 1000kw, the electricity consumption is saved by 12.5kwh/t pulp, and the fiber loss is reduced by 7-8 t/d.
(2) In the preparation method of the invention, the long fiber OCC waste is subjected to low-concentration heavy deslagging and fine screening treatment, so that the wax-containing point is less, and the quality requirements of long fiber pulp preparation and papermaking are met. Therefore, in the preparation method, by stopping the long fiber light slag remover, the actual power of equipment can be reduced by 200kw, the power consumption is saved by 4kwh/t pulp, and the fiber loss is reduced by 0.8-1 t/d.
(3) In the preparation method of the invention, after the national waste OCC long fibers are subjected to low-concentration and heavy deslagging, fine screening and multi-disc concentration, the adhesive is less, the undispersed fine coating blocks are less, and the quality requirements of long fiber pulp preparation and papermaking are met. Therefore, in the preparation method, by disabling long fiber heat dispersion, the actual power of the equipment can be reduced by 900kwh, the electricity consumption is saved by 18kwh/t paper, and the steam consumption is saved by 0.08-0.1 t/t paper.
(4) In the preparation method, the applicant tests and compares the quality of the finished paper of the long fiber of the national waste OCC through disc grinding and pulping without disc grinding, and discovers that compared with the paper of the national waste OCC, the paper of the national waste OCC is limited in improvement of bursting strength due to the fact that the keratinization degree of the fiber of the national waste OCC is high and the fiber of the low-concentration pulping is poor in fibrillation effect; because the beating machine cuts the fibers, the length of the long fiber is only 0.8-1.0 mm, the fibers are short, the strength of the fibers is weakened after the cutting, and the folding endurance of paper is further affected, so that the folding endurance of the finished paper after the beating of the national waste OCC is reduced by 10-20% compared with that of the finished paper after the beating of the national waste OCC without beating. Therefore, in the preparation method, by stopping the long fiber double-disc refiner, the actual power of the long fiber double-disc refiner can be reduced by 900kwh, and the electricity consumption of 18kwh/t paper can be saved.
(5) In the preparation method of the invention, the step S20 of preparing the wood pulp is selectively carried out, when the wood pulp line is stopped, the power of wood pulp line equipment (chain plate machine, pulper, pulp tank stirrer, feeding pump, high-concentration wood pulp slag remover and wood pulp disc mill) can be saved for 1500kwh, and the electricity can be saved for 30kwh/t paper.
(6) In the preparation method, the energy can be saved by about 60-70 kwh/t ton of paper, the steam can be saved by about 0.08-0.1 t/ton of paper, and the waste paper raw material can be saved by 0.04-0.045 t/t of paper ton through the optimization and adjustment of the pulping process. The output of the paper machine is 65 ten thousand tons/year, the electricity can be saved by 3900 to 4200 ten thousand degrees/year, the steam can be saved by 5.2 to 6.5 ten thousand tons/year, and the raw material can be saved by 2.6 to 2.9 ten thousand tons/year.
(7) In the preparation method of the invention, the waste A grade and the BC grade of the national waste are only used to produce 95-210 g/cm without using waste American and European waste 2 A2 ox card has strong paper strength and stable quality, solves the problem that after national waste paper forbidden to be imported, the national waste OCC is used as a main raw material, and is difficult to produce 95-210 g/cm with the same quality 2 A2 production problem of cattle card. The used recycled domestic OCC waste paper accounts for about 95% of all raw materials, meets the requirements of green recycling economic production, has good social benefit and economic benefit, and can be popularized and applied in the field.
As a further embodiment of the present invention, in the method for producing a regenerated kraft according to the second aspect of the invention, the heavy deslagging in steps S102, S103 and S104 is performed by a low-concentration heavy deslagging device, and a pulp saving device is arranged on the low-concentration heavy deslagging device.
By installing the pulp saving device on the low-concentration heavy slag remover of the national waste OCC long, medium and short fiber pulping line, the slag removing rate of the low-concentration heavy slag remover can be effectively regulated to be 0.045-0.05%, the slag removing rate is reduced by 0.025-0.03%, the slag removing ash content of the low-concentration tailings is 65-70%, the slag removing ash content is improved by 5-10%, and the fiber loss is reduced by 30-40 t/d.
The principle of the pulp saving device provided by the invention is as follows: the pulp saving device is a ceramic cone, the upper part of the pulp saving device is connected with the ceramic lower cone of the low-concentration heavy slag remover, the side surface of the pulp saving device is provided with a dilution water connector, the dilution water enters the pulp saving device along a tangent line, the concentration of pulp is reduced, the vortex strength is enhanced, the elutriation effect is achieved, the separation efficiency of fibers and heavy impurities can be effectively improved, the discharge of useful fibers along with tailings is effectively reduced, and therefore the purification effect of the pulp is improved. The slag discharging nozzle is positioned at the bottom of the slurry-saving device, and the slag discharging nozzle and the slag discharging main pipe are connected by using a glass slag discharging pipe, so that the slag discharging condition can be conveniently checked.
As a further embodiment of the present invention, in the method for preparing a regenerated craft paper according to the second aspect of the present invention, the step between the fine screening and the multi-disc concentration in step S102 further includes the steps of:
and (5) refluxing tailings obtained after fine screening to a crushing stage, and crushing again.
In the preparation method, the load of the fine screen is low, and the generated tailings have few untwined paper scraps. Therefore, in the preparation method, tailings generated after the fine screen are returned to the pulper for re-crushing, so that the slag discharge rate of the fine screen can be effectively regulated to be 0.007-0.010%, and the fiber loss is reduced by 5-15 t/d.
As a further embodiment of the present invention, in the method for producing a regenerated craft paper according to the second aspect of the present invention, the wood pulp comprises:
the disintegration concentration of unbleached softwood pulp is 4.0-5.0%, the pulping concentration is 4.0-5.0%, the beating degree of a disc mill outlet is 32-36 DEG SR, and the wet weight of the disc mill outlet fiber is 12-14 g;
the disintegration concentration of unbleached eucalyptus pulp is 4.0-5.0%, the pulping concentration is 4.0-5.0%, the beating degree of a disc mill outlet is 32-36 DEG SR, and the wet weight of disc mill outlet fibers is 2-3 g;
the breaking concentration of the reel substituted wood pulp is 4.0% -5.0%, the pulping concentration is 4.0% -5.0%, the beating degree of the disc mill outlet is 32-36 DEG SR, and the wet weight of the disc mill outlet fiber is 12-14 g.
As a further embodiment of the present invention, in the method for producing a regenerated craft paper according to the second aspect of the present invention:
the click degree of the waste OCC long fiber pulp is 32-36 DEG SR, and the wet weight is 5.5-6.0 g;
the beating degree of the fiber pulp in the waste OCC is 35-40 DEG SR, and the wet weight is 4.5-5.0 g;
the beating degree of the waste OCC fluff pulp is 36-42 DEG SR, and the wet weight is 4.0-4.5 g.
As a further embodiment of the present invention, in the method for producing a regenerated craft paper according to the second aspect of the present invention:
The click degree of the waste OCC long fiber pulp is 32-36 DEG SR, and the wet weight is 6.0-7.5 g;
the fiber pulp in the waste OCC has a beating degree of 35-40 DEG SR and a wet weight of 5.0-6.0 g;
the click degree of the waste OCC short fiber pulp is 36-42 DEG SR, and the wet weight is 4.0-5.0 g;
the raw materials of the national waste OCC long fiber pulp, the national waste OCC medium fiber pulp and the national waste OCC short fiber pulp comprise domestic OCC waste paper and 50% -60% of reel substituted wood pulp in wood pulp.
As a further embodiment of the present invention, in the method for producing a regenerated craft paper according to the second aspect of the present invention:
the click degree of the waste OCC long fiber pulp is 32-36 DEG SR, and the wet weight is 7.0-9.0 g;
the fiber pulp in the waste OCC has a beating degree of 35-40 DEG SR and a wet weight of 5.0-6.0 g;
the click degree of the waste OCC short fiber pulp is 36-42 DEG SR, and the wet weight is 4.0-5.0 g;
raw materials of the national waste OCC long fiber pulp, the national waste OCC medium fiber pulp and the national waste OCC short fiber pulp comprise domestic OCC waste paper and 100% of reel wood pulp in the wood pulp.
As a further embodiment of the present invention, in the method for producing a regenerated craft paper according to the second aspect of the present invention, in step S50, before the "feeding into the wire section", the method further includes: AKD (water resistant sizing agent), a dry strength agent, aluminum sulfate, a solid retention agent, an emulsion retention agent, a defoaming agent, a bactericide and a dye are respectively added into the surface layer slurry, the core layer slurry and the bottom layer slurry.
In the method for preparing a regenerated kraft according to the second aspect of the invention, preferably, the AKD is added in an amount of 1 to 12kg/t of paper. By adding 1-12 kg/t AKD of paper, the water absorption of the paper can be effectively improved.
Preferably, the addition amount of the dry strength agent is 10-25 kg/t paper. The dry strength agent of 10-25 kg/t paper is added, so that the bursting strength of the paper can be improved.
Preferably, the addition amount of the aluminum sulfate is 4-8 kg/t paper. The pH value of the net-surfing sizing agent can be controlled to be 6.5-7.0 by adding 4-8 kg/t of aluminum sulfate.
Preferably, the addition amount of the solid retention aid is 0.2-0.3 kg/t paper; the addition amount of the emulsion retention aid is 0.2-0.3 kg/t paper. By adding 0.2-0.4 kg/t of solid retention aid and 0.2-0.3 kg/t of emulsion retention aid, the retention rate of the net part can be effectively improved to 50-60%, and the concentration of the water in the net can be regulated to 0.3-0.5%.
Preferably, the addition amount of the defoaming agent is 0.2-0.4 kg/t of paper. By adding the defoaming agent of 0.2-0.4 kg/t paper, the foam condition of the paper machine system can be effectively improved and the air content of the sizing agent is regulated to be 1.5-2.5%.
Preferably, the addition amount of the bactericide is 0.05-0.1 kg/t of paper. By adding bactericide, the bacterial content in slurry and white water of the flow system can be effectively reduced to less than 10 8 Maintaining the clean of normal system.
Preferably, the dye is added in an amount of 2.5 to 3.5kg/t of paper. By adding the dye, the paper color L, a and b values can be controlled within a qualified range.
In the following specific embodiments, the amounts of the chemical auxiliary materials such as AKD, a dry strength agent, aluminum sulfate, a solid retention aid, an emulsion retention aid, a defoaming agent, a bactericide, and a dye may be adjusted correspondingly within the above-mentioned range according to specific process conditions, so as to achieve corresponding process requirements, so that the specific amounts of the chemical auxiliary materials are not specifically listed in the specific embodiments. As a further embodiment of the present invention, in the method for producing a regenerated kraft according to the second aspect of the invention, a surface sizing agent and a surface sizing starch are added during the "surface sizing" in step S50.
In the method for preparing the high-gram-weight regenerated craft paper according to the second aspect of the present invention, preferably, the addition amount of the surface sizing agent is 1.5-2.5 kg/t paper. The water absorption of the paper can be further improved by adding 1.5-2.5 kg/t of surface sizing agent of the paper, and the water absorption cobb value of the surface layer is regulated to be 30-40 g/m 2 The cobb value of the bottom layer is 30-40 g/m 2 。
In the method for preparing the regenerated craft paper according to the second aspect of the present invention, preferably, the surface sizing starch is added in an amount of 40-45 kg/t paper. The bursting strength of the finished paper can be further improved by using 40-45 kg/t of surface sizing starch of the paper, so that the bursting index of the finished paper is controlled to be 2.4-2.5 kpa.m 2 And/g, the folding endurance is 25-45 times.
The following examples of the regenerated kraft paper of A2 are provided to further illustrate the invention, but are not intended to limit the scope of the invention.
Materials, reagents, instrumentation, and the like used in the specific embodiments of the invention, unless otherwise specified, are all commercially available; the adopted technological method, conditions and the like are conventional methods and conditions unless otherwise specified. For example, but not limited to, the domestic OCC waste paper used in the embodiments of the present invention is double-sorted waste cardboard paper, and the source of goods is from supermarkets, industrial and commercial institutions.
Example 1 sheet test of American waste, european waste and national waste raw materials
In the embodiment, the raw materials of the American waste, the European waste and the national waste are crushed, deslagged, screened, purified and concentrated to slurry, the slurry is respectively disintegrated to be uniform, and then sheet making tests are respectively carried out, wherein the sheet making quantitative is 100g/cm 2 MeasuringThe test results were all averaged after three determinations. The test results are shown in Table 1.
TABLE 1 results of sheet test of American waste, european waste and national waste
As can be seen from Table 1, the length of the waste fiber is good, the fiber strength is high, and the burst strength and the folding endurance of the waste OCC raw material sheet are high; european waste has inferior performances in all aspects; the fiber average length of the national waste OCC raw material sheet is low, the fiber binding force is poor, the fiber strength is low, and the burst strength and the folding endurance are inferior to those of American waste and European waste. And the burst strength and the folding endurance of the national waste grade A, grade B, grade C and grade D are low. The D level is worst, the impurity content of the mixed paper is high, the ash content is high, and the mixed paper is used for making kraft paper, and the paper quality and the paper strength are affected; the color L value of the C-grade national waste sheet is higher than that of the A-grade national waste and the B-grade national waste.
Therefore, after comprehensively considering the strength and the hue of the waste raw materials, in the embodiment of the invention, the preferable ratio of the domestic OCC is as follows: 70-80% of national waste A grade and 20-30% of national waste BC grade. Preferably, the ratio of the domestic OCC adopts: 70-80% of national waste A grade, 10-25% of national waste B grade and 5-10% of national waste C grade. When the color L value of the finished paper is lower than 56, the national waste C grade proportion can be improved to 10 percent.
Example 2 sheet test of wood pulp
In this example, unbleached sulfate softwood pulp (unbleached softwood pulp), unbleached sulfate hardwood pulp (unbleached eucalyptus pulp) and imported roll regenerated pulp (roll substituted wood pulp, fiber component 100% chemical pulp) were disintegrated, deslagged, disc-milled and pulped into pulp, and then sheet-making test was performed respectively, and the test results are shown in table 2; meanwhile, different woodpulps were subjected to a proportioning sheet making test, and the test results are shown in Table 3. The test results were averaged after three determinations.
Table 2 results of sheet test of wood pulp
As is clear from Table 2, the unbleached sulfate needle pulp had the best burst index and folding strength. While the burst index and folding strength of unbleached eucalyptus pulp and rolled substituted wood pulp are lower than those of unbleached softwood pulp, the production test is performed as an alternative pulp in the following embodiments because of the economical supply.
Table 3 results of sheet making tests with different wood pulps
As is clear from Table 3, when the unbleached eucalyptus pulp and the rolled wood pulp were blended at different ratios, the burst strength of the sheet was not greatly changed. Unbleached eucalyptus pulp and reel substituted wood pulp at 1:9, the folding endurance of the sheet can reach 1876 times when the sheet is blended according to the proportion of 2:8, when the mixture is blended, the folding endurance of the sheet can reach 1714 times; after the proportion of the unbleached eucalyptus pulp is increased, the folding endurance of the papermaking sheet is reduced from 1714 times to 700 times, and the amplitude reduction is larger. When the unbleached eucalyptus pulp, the reel substituted wood pulp and the unbleached softwood pulp are mixed and copied in different proportions, the burst strength of the sheet is not greatly changed, and the folding endurance is lower than that of the unbleached eucalyptus pulp and the reel substituted wood pulp.
From the above analysis, it can be seen that 100% unbleached softwood pulp, or 100% reel-up wood pulp, or unbleached eucalyptus pulp and reel-up wood pulp are used at 1: 9-2: 8 ratio of mixed composite pulp or unbleached softwood pulp, unbleached eucalyptus pulp and reel substituted wood pulp by 1: (2-5): the sheet obtained from the composite pulp mixed in the proportion of (4-7) has higher burst strength and folding endurance.
Thus, in embodiments of the present invention, preferably, 100% unbleached softwood pulp, or 100% spool substituted wood pulp, or 100% unbleached eucalyptus pulp, or both unbleached eucalyptus pulp and spool substituted wood pulp are used in (1-2): (8-9) mixing the composite pulp or unbleached softwood pulp, unbleached eucalyptus pulp and reel substituted wood pulp according to the proportion of 1: (2-5): (4-7) mixing the composite slurry in proportion.
Example 3 sheet making bench of slurry
In the embodiment, firstly, domestic OCC waste paper is subjected to disintegration, high-concentration deslagging, coarse screening, fiber grading, staple fiber heavy deslagging and staple fiber concentration to obtain domestic OCC staple fiber pulp. Then, the national waste OCC fluff pulp (the raw material ratio is 60% of grade A national waste and 40% of grade B national waste) and wood pulp are subjected to a blending test, and the test results are all obtained by three times of measurement and then are averaged. The test results are shown in tables 4 and 5.
Table 4 results of sheet making test of unbleached eucalyptus pulp and staple fiber pulp
TABLE 5 sheet test results for unbleached needle pulp and staple pulp
Table 6 results of sheet test of wound-rotor substituted wood pulp and fluff pulp
As is clear from Table 4, 10 to 30% of unbleached eucalyptus pulp and OCC fluff pulp were blended, and the burst strength of the sheet was 1.54 to 1.85kpa.m 2 Per gram, is improved by 0.1 to 0.41kpa.m than 100 percent of OCC short fiber sheet 2 /g。
As is clear from Table 5, 5% unbleached needle pulp was blended with OCC fluff pulp, and the burst strength of the sheet was 1.59kpa.m 2 Per gram, 0.15kpa.m higher than 100% OCC staple sheet 2 /g;20% unbleached needle pulp and national waste OCC short fiber pulp are mixed and made, and the burst strength of the sheet is 2.53kpa.m 2 Per gram, 1.09kpa.m higher than 100% OCC staple sheet 2 /g; the burst strength does not change much when the addition amount of the unbleached needle pulp is increased from 20% to 30%.
As shown in Table 6, 5% -20% of the rolled wood pulp is blended with the short fibers, the burst index is 1.57-1.98 kpa.m2/g, the burst index is improved by 0.13-0.54 kpa.m2/g compared with 100% of OCC short fiber sheet, the burst resistance is 9-35 times, and the burst index is improved by 4-30 times compared with 100% of OCC short fiber sheet.
It can be seen from the comprehensive results of tables 4, 5 and 6 that the burst strength and folding strength of the paper can be effectively improved by using the national waste OCC as the main raw material and adding part of wood pulp. In the embodiment of the invention, preferably, the raw material proportioning process scheme comprises the following steps: 5-20% of unbleached softwood pulp and 80-95% of waste OCC; or 5-20% of reel substituted wood pulp and 80-95% of national waste OCC; or 10-30% of unbleached eucalyptus pulp and 70-90% of waste; or any two or three of softwood pulp, reel substituted wood pulp and unbleached eucalyptus pulp are simultaneously matched and used, the wood pulp proportion is 5-20%, and the national waste is 80-95%.
Example 4A2 production of Calf paper # 1
1. The raw materials are as follows:
(1) Wood pulp proportioning: 100% unbleached softwood pulp.
(2) Domestic OCC waste paper proportion: 70 percent of grade A national waste, 30 percent of grade BC national waste (20 percent to 25 percent of grade B national waste, 5 percent to 10 percent of grade C national waste) and when the color L value is lower than 56, the proportion of grade C national waste is improved to 10 percent.
(3) The slurry ratio is as follows: 5 to 15 percent of wood pulp and 85 to 95 percent of national waste OCC pulp.
2. Preparing sizing agent for surface, core and bottom layer:
(1) Surface layer: the wood pulp is added in the surface layer, the proportion of the wood pulp in the surface layer is 35-50%, and the proportion of the fiber in the OCC is 50-65%.
(2) Core layer: 40-50% of OCC long fiber, 40-50% of short fiber, and 10-20% of damaged paper and cushion recovery pulp.
(3) The bottom layer: 40-50% of OCC long fiber, 40-50% of short fiber, and 10-20% of damaged paper and cushion recovery pulp.
3. Referring to fig. 1, the preparation of the waste OCC slurry specifically comprises the following steps:
(1) And (3) feeding, crushing, high-concentration deslagging and coarse screening the domestic OCC waste paper with the formula amount, and then classifying and sorting the fibers into the domestic OCC long fibers, the domestic OCC medium fibers and the domestic OCC short fibers.
(2) And (3) carrying out heavy deslagging, fine screening and multi-disc concentration on the national waste OCC long fiber to obtain national waste OCC long fiber pulp, and delivering the national waste OCC long fiber pulp to a mixed pulp pool for pulp preparation.
(3) And (3) carrying out heavy deslagging, light deslagging, multi-disc concentration and heat dispersion on the fiber in the national waste OCC to obtain fiber pulp in the national waste OCC, and delivering the fiber pulp to a mixing pulp tank for pulp preparation.
(4) And (3) carrying out heavy deslagging and multi-disc concentration on the national waste OCC short fibers to obtain national waste OCC short fiber pulp, and delivering the national waste OCC short fiber pulp to a mixed pulp tank for pulp preparation.
4. Referring to fig. 2, the preparation of wood pulp is as follows:
pulp bags of unbleached softwood pulp with the formula amount are subjected to feeding, crushing, high-concentration deslagging, disc grinding and pulping to obtain wood pulp, and the wood pulp is sent to a mixed pulp tank for pulp preparation.
5. Preparation of broke and cushion recovery pulp:
and recycling the damaged paper and the cushion layer generated in the production process, re-pulping to obtain recycled pulp of the damaged paper and the cushion layer, and delivering the recycled pulp to a mixed pulp pool for pulp preparation.
6. Preparing slurry: and (3) carrying out slurry preparation according to the formula to obtain surface layer slurry, core layer slurry and bottom layer slurry.
7. Referring to fig. 3, the specific process is as follows:
the surface layer slurry, the core layer slurry and the bottom layer slurry obtained by slurry preparation flow into a surface layer slurry head box, a core layer slurry head box and a bottom layer slurry head box respectively through a slurry filling pump and a pressure screen; AKD, a dry strength agent, aluminum sulfate, a solid retention agent, an emulsion retention agent, a defoaming agent, a bactericide and a dye are respectively added into the surface layer slurry, the core layer slurry and the bottom layer slurry; and then the paper is sent into a net part for dehydration forming of the net part, and the regenerated kraft paper is manufactured through the steps of squeezing and dehydration of a squeezing part, drying of a front drying part, surface sizing, drying of a rear drying part, calendaring, coiling and rewinding. Wherein, in the surface sizing process, a surface sizing agent and surface sizing starch are added.
8. Slurry properties:
the wood pulp has a disintegration concentration of 4.0-5.0%, a pulping concentration of 4.0-5.0%, a beating degree of 32-36 DEG SR at the disc mill outlet, and a wet weight of 12-14 g at the disc mill outlet.
The click degree of the waste OCC long fiber pulp is 32-36 DEG SR, and the wet weight is 5.5-6.0 g;
the beating degree of the fiber pulp in the waste OCC is 35-40 DEG SR, and the wet weight is 4.5-5.0 g;
the beating degree of the waste OCC fluff pulp is 36-42 DEG SR, and the wet weight is 4.0-4.5 g.
9. The paper index test results of the regenerated kraft are shown in table 7.
Table 7 table of results of sheet index test of regenerated kraft
As shown in Table 7, the amount of unbleached softwood pulp is 76-84 kg/t, the unit consumption of the surface sizing starch is 42-43 kg/t, and the unit consumption of the dry strength agent is 13-15 kg/t. The indexes of burst resistance, folding resistance and color phase of the finished paper all reach the A2 cattle card standard.
Example 5A2 production of Calf paper # 2
1. The raw materials are as follows:
(1) Wood pulp proportioning: 100% inlet recycled pulp (rolled wood pulp).
(2) Domestic OCC waste paper proportion: 70% of class A national waste and 30% of class BC national waste.
(3) The slurry ratio is as follows: 5 to 15 percent of wood pulp and 85 to 95 percent of national waste OCC pulp.
2. Preparing sizing agent for surface, core and bottom layer:
(1) Surface layer: the first wood pulp is 25-35% and the fiber in the national waste OCC is 65-75%. Wherein the first wood pulp comprises 40% -50% of the reel wood pulp in the wood pulp.
(2) Core layer: 40-50% of OCC long fiber, 40-50% of short fiber, and 10-20% of damaged paper and cushion recovery pulp.
(3) The bottom layer: 40-50% of OCC long fiber, 40-50% of short fiber, and 10-20% of damaged paper and cushion recovery pulp.
Wherein, the balance of 50% -60% of the components of the rolled wood pulp replacing pulp package in the wood pulp are fed into an OCC pulper to be mixed with domestic OCC waste paper for preparing long fiber, medium fiber and short fiber pulp.
In this embodiment, the specific steps of 3, preparation of the waste OCC pulp→7 and paper manufacture are the same as those in embodiment 4, except that the wood pulp used in this embodiment is reel substituted wood pulp, and the waste OCC long fiber, medium fiber and short fiber pulp is formed by mixing and processing the reel substituted wood pulp and domestic OCC waste paper.
8. Slurry properties:
the breaking concentration of the reel substituted wood pulp is 4.0% -5.0%, the pulping concentration is 4.0% -5.0%, the beating degree of the disc mill outlet is 32-36 DEG SR, and the wet weight of the disc mill outlet fiber is 12-14 g.
The properties of the national waste OCC long fiber, medium fiber and short fiber slurry formed by mixing and processing the reel wood pulp and the domestic OCC waste paper are as follows:
the click degree of the waste OCC long fiber pulp is 32-36 DEG SR, and the wet weight is 6.0-7.5 g;
The fiber pulp in the waste OCC has a beating degree of 35-40 DEG SR and a wet weight of 5.0-6.0 g;
the beating degree of the waste OCC fluff pulp is 36-42 DEG SR, and the wet weight is 4.0-5.0 g.
9. The paper index test results of the regenerated kraft are shown in table 8.
Table 8 test results table of paper index of regenerated craft paper
As shown in Table 8, the usage amount of the wood pulp replaced by the winding drum is 86-91 kg/t, the unit consumption of the surface sizing starch is 43kg/t, and the unit consumption of the dry strength agent is 8-10 kg/t. The paper burst and folding index reaches the A2 ox card standard, but the paper color index L value is 55-56, which is slightly lower than the A2 ox card standard L value 57-59. Based on the above, the L value of the finished paper of the embodiment can be improved to the A2 NICA standard by increasing the proportion of C-class national waste or adding a proper amount of unbleached eucalyptus pulp and/or unbleached softwood pulp with the L value larger than 68.
Example 6A2 3# production of Calf paper
1. The raw materials are as follows:
(1) Wood pulp proportioning: 100% unbleached sulfate broadleaf pulp (unbleached eucalyptus pulp).
(2) Domestic OCC waste paper proportion: 70% of class A national waste and 30% of class BC national waste.
(3) The slurry ratio is as follows: 10 to 15 percent of wood pulp and 85 to 90 percent of national waste OCC pulp.
2. Preparing sizing agent for surface, core and bottom layer:
(1) Surface layer: the wood pulp is added in the surface layer, the proportion of the wood pulp in the surface layer is 35-50%, and the proportion of the fiber in the OCC is 50-65%.
(2) Core layer: 40-50% of OCC long fiber, 40-50% of short fiber, and 10-20% of damaged paper and cushion recovery pulp.
(3) The bottom layer: 40-50% of OCC long fiber, 40-50% of short fiber, and 10-20% of damaged paper and cushion recovery pulp.
In this example, the specific steps of 3, preparation of waste OCC pulp → 7, paper manufacture are the same as those in example 4, except that the wood pulp used in this example is unbleached eucalyptus pulp.
8. Slurry properties:
the wood pulp has a disintegration concentration of 4.0-5.0%, a pulping concentration of 4.0-5.0%, a beating degree of 32-36 DEG SR at the disc mill outlet, and a wet weight of 2-3 g at the disc mill outlet.
The click degree of the waste OCC long fiber pulp is 32-36 DEG SR, and the wet weight is 5.5-6.0 g;
the beating degree of the fiber pulp in the waste OCC is 35-40 DEG SR, and the wet weight is 4.5-5.0 g;
the beating degree of the waste OCC fluff pulp is 36-42 DEG SR, and the wet weight is 4.0-4.5 g.
9. The results of the paper index test of the regenerated kraft are shown in table 9.
Table 9 table of results of sheet index test of regenerated kraft
As shown in the results of Table 9, the dosage of the unbleached eucalyptus pulp is 120-150 kg/t, the unit consumption of the surface sizing starch is 43-45 kg/t, and the unit consumption of the dry strength agent is 8-15 kg/t. The burst and folding indexes of the finished paper all reach the A2 ox card standard, the color L value is 57-58, and the color L value reaches 57-59 of the A2 ox card standard better.
Example 7A2 production of Calf paper # 4
1. The raw materials are as follows:
(1) Wood pulp proportioning: 80% of imported recycled pulp (rolled wood pulp), 20% of unbleached eucalyptus pulp.
(2) Domestic OCC waste paper proportion: 70% of class A national waste and 30% of class BC national waste.
(3) The slurry ratio is as follows: 5 to 15 percent of wood pulp and 85 to 95 percent of national waste OCC pulp.
2. Preparing sizing agent for surface, core and bottom layer:
(1) Surface layer: the first wood pulp is 25-35% and the fiber in the national waste OCC is 65-75%. Wherein the first wood pulp comprises 40% -50% of the reel-up wood pulp in the wood pulp and all the added unbleached eucalyptus pulp.
(2) Core layer: 40-50% of OCC long fiber, 40-50% of short fiber, and 10-20% of damaged paper and cushion recovery pulp.
(3) The bottom layer: 40-50% of OCC long fiber, 40-50% of short fiber, and 10-20% of damaged paper and cushion recovery pulp.
Wherein, the balance of 50% -60% of the reel substituted wood pulp in the wood pulp is added into an OCC pulper to be mixed with domestic OCC waste paper for preparing long fiber, medium fiber and short fiber pulp.
In this embodiment, the specific steps of 3, preparation of the waste OCC pulp → 7, and paper manufacture are the same as those in embodiment 4, except that the wood pulp used in this embodiment is reel substituted wood pulp and unbleached eucalyptus pulp, and the waste OCC long fiber, middle fiber and short fiber pulp are formed by mixing and processing the reel substituted wood pulp and domestic OCC waste paper.
8. Slurry properties:
the disintegration concentration of wood pulp (80% of reel substituted wood pulp and 20% of unbleached eucalyptus pulp) is 4.0% -5.0%, the pulping concentration is 4.0% -5.0%, the beating degree of a disc mill outlet is 32-36 DEG SR, and the wet weight of the disc mill outlet fiber is 11-14 g.
The properties of the national waste OCC long fiber, medium fiber and short fiber slurry formed by mixing and processing the reel wood pulp and the domestic OCC waste paper are as follows:
the click degree of the waste OCC long fiber pulp is 32-36 DEG SR, and the wet weight is 6.0-7.5 g;
the fiber pulp in the waste OCC has a beating degree of 35-40 DEG SR and a wet weight of 5.0-6.0 g;
the beating degree of the waste OCC fluff pulp is 36-42 DEG SR, and the wet weight is 4.0-5.0 g.
9. The paper index test results of the regenerated kraft are shown in table 10.
Table 10 test results table of paper index of regenerated kraft
As can be seen from the results in Table 10, the wood pulp (80% of the rolled wood pulp and 20% of the unbleached eucalyptus pulp) is used in an amount of 85-101 kg/t paper, the unit consumption of the surface sizing starch is 43-52 kg/t, and the unit consumption of the dry strength agent is 7.4-12 kg/t. The indexes of burst resistance, folding resistance and color phase of the finished paper all reach the A2 cattle card standard.
Example 8A2 production of Calf paper # 5
1. The raw materials are as follows:
(1) Wood pulp proportioning: 100% inlet recycled pulp (rolled wood pulp).
(2) Domestic OCC waste paper proportion: 70% of class A national waste and 30% of class BC national waste.
(3) The slurry ratio is as follows: 8 to 12 percent of wood pulp and 88 to 92 percent of national waste OCC pulp.
2. Preparing sizing agent for surface, core and bottom layer:
(1) Surface layer: the proportion of the fiber in the national waste OCC is 100 percent.
(2) Core layer: 40-50% of OCC long fiber, 40-50% of short fiber, and 10-20% of damaged paper and cushion recovery pulp.
(3) The bottom layer: 40-50% of OCC long fiber, 40-50% of short fiber, and 10-20% of damaged paper and cushion recovery pulp.
Wherein, the 100% pulp bags of the reel wood pulp are all fed into an OCC pulper to be mixed with domestic OCC waste paper to prepare long fiber, medium fiber and short fiber pulp.
3. Referring to fig. 1, the preparation of the waste OCC slurry specifically comprises the following steps:
(1) The method comprises the steps of feeding, crushing, high-concentration deslagging and coarse screening the reel wood pulp and domestic OCC waste paper with the formula amount, and then classifying and sorting the fibers into national waste OCC long fibers, national waste OCC medium fibers and national waste OCC short fibers.
(2) And (3) carrying out heavy deslagging, fine screening, multi-disc concentration and disc grinding pulping on the national waste OCC long fiber to obtain national waste OCC long fiber pulp, and delivering the national waste OCC long fiber pulp to a mixing pulp tank for pulp preparation. In which "disc beating" is only necessary in this embodiment and is not shown in fig. 1.
(3) And (3) carrying out heavy deslagging, light deslagging, multi-disc concentration and heat dispersion on the fiber in the national waste OCC to obtain fiber pulp in the national waste OCC, and delivering the fiber pulp to a mixing pulp tank for pulp preparation.
(4) And (3) carrying out heavy deslagging and multi-disc concentration on the national waste OCC short fibers to obtain national waste OCC short fiber pulp, and delivering the national waste OCC short fiber pulp to a mixed pulp tank for pulp preparation.
4. Preparation of broke and cushion recovery pulp:
and recycling the damaged paper and the cushion layer generated in the production process, re-pulping to obtain recycled pulp of the damaged paper and the cushion layer, and delivering the recycled pulp to a mixed pulp pool for pulp preparation.
5. Preparing slurry: and (3) preparing slurry according to the formula amount to obtain surface layer slurry, core layer slurry and bottom layer slurry.
6. Referring to fig. 3, the specific process is as follows:
the surface layer slurry, the core layer slurry and the bottom layer slurry obtained by slurry preparation flow into a surface layer slurry head box, a core layer slurry head box and a bottom layer slurry head box respectively through a slurry filling pump and a pressure screen; AKD, a dry strength agent, aluminum sulfate, a solid retention agent, an emulsion retention agent, a defoaming agent, a bactericide and a dye are respectively added into the surface layer slurry, the core layer slurry and the bottom layer slurry; and then the paper is sent into a net part for dehydration forming of the net part, and the regenerated kraft paper is manufactured through the steps of squeezing and dehydration of a squeezing part, drying of a front drying part, surface sizing, drying of a rear drying part, calendaring, coiling and rewinding. Wherein, in the surface sizing process, a surface sizing agent and surface sizing starch are added.
7. Slurry properties:
the properties of the national waste OCC long fiber, medium fiber and short fiber slurry formed by mixing and processing the reel wood pulp and the domestic OCC waste paper are as follows:
the click degree of the waste OCC long fiber pulp is 32-36 DEG SR, and the wet weight is 7.0-9.0 g;
the fiber pulp in the waste OCC has a beating degree of 35-40 DEG SR and a wet weight of 5.0-6.0 g;
the beating degree of the waste OCC fluff pulp is 36-42 DEG SR, and the wet weight is 4.0-5.0 g.
8. The paper index test results of the regenerated kraft are shown in table 11.
Table 11 test results table of paper index of regenerated craft paper
As shown in Table 11, the usage amount of the wood pulp replaced by the winding drum is 90-96 kg/t, the unit consumption of the surface sizing starch is 42-45 kg/t, and the unit consumption of the dry strength agent is 8-10 kg/t. The indexes of burst resistance, folding resistance and color value of the finished paper all reach the A2 NI-Ka standard.
In addition, 100% of the rolled wood pulp is fully fed into an OCC pulper to be mixed with domestic OCC waste paper to prepare long fiber, medium fiber and short fiber pulp. Therefore, the wood pulp line is stopped and started, the power of wood pulp line equipment (chain plate machine, pulper, pulp tank stirrer, feeding pump, high-concentration wood pulp slag remover and wood pulp disc mill) can be saved by 1500kwh, and the electricity can be saved by 30kwh/t paper.
Example 9A2 production of Calf paper # 6
1. The raw materials are as follows:
(1) Wood pulp proportioning: 100% unbleached softwood pulp.
(2) Domestic OCC waste paper proportion: 80% of class A national waste and 20% of class BC national waste.
(3) The slurry ratio is as follows: 10 to 15 percent of wood pulp and 85 to 90 percent of national waste OCC pulp.
2. Preparing sizing agent for surface, core and bottom layer:
(1) Surface layer: the wood pulp is added in the surface layer, the proportion of the wood pulp in the surface layer is 50-80%, and the proportion of the fiber in the OCC is 20-50%.
(2) Core layer: 40-50% of OCC long fiber, 40-50% of short fiber, and 10-20% of damaged paper and cushion recovery pulp.
(3) The bottom layer: 40-50% of OCC long fiber, 40-50% of short fiber, and 10-20% of damaged paper and cushion recovery pulp.
In this example, the specific steps of 3, preparation of waste OCC slurry→7, and paper manufacture were the same as in example 4.
8. Slurry properties:
the wood pulp has a disintegration concentration of 4.0-5.0%, a pulping concentration of 4.0-5.0%, a beating degree of 32-36 DEG SR at the disc mill outlet, and a wet weight of 12-14 g at the disc mill outlet.
The click degree of the waste OCC long fiber pulp is 32-36 DEG SR, and the wet weight is 5.5-6.0 g;
the beating degree of the fiber pulp in the waste OCC is 35-40 DEG SR, and the wet weight is 4.5-5.0 g;
the beating degree of the waste OCC fluff pulp is 36-42 DEG SR, and the wet weight is 4.0-4.5 g.
9. The paper index test results of the regenerated kraft are shown in table 12.
Table 12 test results table of paper index of regenerated craft paper
As shown in Table 12, the amount of unbleached softwood pulp is 120-135 kg/t, the unit consumption of surface sizing starch is 42-48 kg/t, and the unit consumption of dry strength agent is 8-10 kg/t. The indexes of burst resistance, folding resistance and color phase of the finished paper all reach the A2 cattle card standard.
Example 10A2 production of 7# cattle Care paper
1. The raw materials are as follows:
(1) Wood pulp proportioning: 100% inlet recycled pulp (rolled wood pulp).
(2) Domestic OCC waste paper proportion: 80% of class A national waste and 20% of class BC national waste.
(3) The slurry ratio is as follows: 15-20% of wood pulp and 80-85% of national waste OCC pulp.
2. Preparing sizing agent for surface, core and bottom layer:
(1) Surface layer: the wood pulp is added in the surface layer, the proportion of the wood pulp in the surface layer is 60-90%, and the proportion of the fiber in the waste OCC is 10-40%.
(2) Core layer: 40-50% of OCC long fiber, 40-50% of short fiber, and 10-20% of damaged paper and cushion recovery pulp.
(3) The bottom layer: 40-50% of OCC long fiber, 40-50% of short fiber, and 10-20% of damaged paper and cushion recovery pulp.
In this example, the specific steps of 3, preparation of waste OCC pulp → 7, paper manufacture are the same as those in example 4, except that the wood pulp used in this example is a rolled wood pulp.
8. Slurry properties:
the breaking concentration of the reel substituted wood pulp is 4.0% -5.0%, the pulping concentration is 4.0% -5.0%, the beating degree of the disc mill outlet is 32-36 DEG SR, and the wet weight of the disc mill outlet fiber is 12-14 g.
The click degree of the waste OCC long fiber pulp is 32-36 DEG SR, and the wet weight is 5.5-6.0 g;
the beating degree of the fiber pulp in the waste OCC is 35-40 DEG SR, and the wet weight is 4.5-5.0 g;
the beating degree of the waste OCC fluff pulp is 36-42 DEG SR, and the wet weight is 4.0-4.5 g.
9. The paper index test results of the regenerated kraft are shown in table 13.
Table 13 paper index test results table of regenerated kraft
As shown in Table 13, the usage amount of the wood pulp replaced by the winding drum is 152-162 kg/t, the unit consumption of the surface sizing starch is 42-48 kg/t, and the unit consumption of the dry strength agent is 6-10 kg/t. The indexes of burst resistance, folding resistance and color value of the finished paper all reach the A2 NI-Ka standard.
Example 11A2 production of Calf paper # 8
1. The raw materials are as follows:
(1) Wood pulp proportioning: 100% unbleached sulfate broadleaf pulp (unbleached eucalyptus pulp).
(2) Domestic OCC waste paper proportion: 80% of class A national waste and 20% of class BC national waste.
(3) The slurry ratio is as follows: 15-20% of wood pulp and 80-85% of national waste OCC pulp.
2. Preparing sizing agent for surface, core and bottom layer:
(1) Surface layer: the wood pulp is added in the surface layer, the proportion of the wood pulp in the surface layer is 60-90%, and the proportion of the fiber in the OCC is 10-40%.
(2) Core layer: 40-50% of OCC long fiber, 40-50% of short fiber, and 10-20% of damaged paper and cushion recovery pulp.
(3) The bottom layer: 40-50% of OCC long fiber, 40-50% of short fiber, and 10-20% of damaged paper and cushion recovery pulp.
In this example, the specific steps of 3, preparation of waste OCC pulp → 7, paper manufacture are the same as those in example 4, except that the wood pulp used in this example is unbleached eucalyptus pulp.
8. Slurry properties:
the wood pulp has a disintegration concentration of 4.0-5.0%, a pulping concentration of 4.0-5.0%, a beating degree of 32-36 DEG SR at the disc mill outlet, and a wet weight of 2-3 g at the disc mill outlet.
The click degree of the waste OCC long fiber pulp is 32-36 DEG SR, and the wet weight is 5.5-6.0 g;
the beating degree of the fiber pulp in the waste OCC is 35-40 DEG SR, and the wet weight is 4.5-5.0 g;
the beating degree of the waste OCC fluff pulp is 36-42 DEG SR, and the wet weight is 4.0-4.5 g.
9. The results of the paper index test of the regenerated kraft are shown in table 14.
Table 14 test results table of paper index of regenerated kraft
As shown in Table 14, the amount of the wood pulp replaced by the reel is 149-168 kg/t, the unit consumption of the surface sizing starch is 35-45 kg/t, and the unit consumption of the dry strength agent is 5-8 kg/t. The indexes of burst resistance, folding resistance and color value of the finished paper all reach the A2 NI-Ka standard.
Example 12A2 production of 9# cattle Care paper
1. The raw materials are as follows:
(1) Wood pulp proportioning: 90% of imported recycled pulp (reel-up pulp), 10% of unbleached eucalyptus pulp.
(2) Domestic OCC waste paper proportion: 80% of class A national waste and 20% of class BC national waste.
(3) The slurry ratio is as follows: 10 to 15 percent of wood pulp and 85 to 90 percent of national waste OCC pulp.
2. Preparing sizing agent for surface, core and bottom layer:
(1) Surface layer: the wood pulp is added in the surface layer, the proportion of the wood pulp in the surface layer is 30-60%, and the proportion of the fiber in the OCC is 40-70%.
(2) Core layer: 40-50% of OCC long fiber, 40-50% of short fiber, and 10-20% of damaged paper and cushion recovery pulp.
(3) The bottom layer: 40-50% of OCC long fiber, 40-50% of short fiber, and 10-20% of damaged paper and cushion recovery pulp.
In this example, the specific steps of 3, preparation of waste OCC pulp → 7, paper manufacture are the same as those in example 4, except that the wood pulp used in this example is a rolled wood pulp and an unbleached eucalyptus pulp.
8. Slurry properties:
the disintegration concentration of wood pulp (70% of reel substituted wood pulp and 30% of unbleached eucalyptus pulp) is 4.0% -5.0%, the pulping concentration is 4.0% -5.0%, the beating degree of a disc mill outlet is 32-36 DEG SR, and the wet weight of disc mill outlet fibers is 11-14 g.
The click degree of the waste OCC long fiber pulp is 32-36 DEG SR, and the wet weight is 5.5-6.0 g;
the beating degree of the fiber pulp in the waste OCC is 35-40 DEG SR, and the wet weight is 4.5-5.0 g;
the beating degree of the waste OCC fluff pulp is 36-42 DEG SR, and the wet weight is 4.0-4.5 g.
9. The paper index test results of the regenerated kraft are shown in table 15.
Table 15 test results table of paper index of regenerated kraft
As can be seen from the results in Table 15, the wood pulp (90% of the rolled wood pulp and 10% of the unbleached eucalyptus pulp) was used in an amount of 103 to 116kg/t per unit of paper, the surface sizing agent was used in an amount of 33.5 to 48kg/t per unit of starch, and the dry strength agent was used in an amount of 17 to 24kg/t per unit of starch. The indexes of burst resistance, folding resistance and color phase of the finished paper all reach the A2 cattle card standard.
Example 13A2 production of 10# cattle Care paper
1. The raw materials are as follows:
(1) Wood pulp proportioning: 100% inlet recycled pulp (rolled wood pulp).
(2) Domestic OCC waste paper proportion: 80% of class A national waste and 20% of class BC national waste.
(3) The slurry ratio is as follows: 10 to 15 percent of wood pulp and 85 to 90 percent of national waste OCC pulp.
2. Preparing sizing agent for surface, core and bottom layer:
(1) Surface layer: the wood pulp is added in the surface layer, the proportion of the wood pulp in the surface layer is 30-60%, and the proportion of the fiber in the waste OCC is 40-70%.
(2) Core layer: 40-50% of OCC long fiber, 40-50% of short fiber, and 10-20% of damaged paper and cushion recovery pulp.
(3) The bottom layer: 40-50% of OCC long fiber, 40-50% of short fiber, and 10-20% of damaged paper and cushion recovery pulp.
In this example, the specific steps of 3, preparation of waste OCC pulp → 7, paper manufacture are the same as those in example 4, except that the wood pulp used in this example is a rolled wood pulp.
8. Slurry properties:
the breaking concentration of the reel substituted wood pulp is 4.0% -5.0%, the pulping concentration is 4.0% -5.0%, the beating degree of the disc mill outlet is 32-36 DEG SR, and the wet weight of the disc mill outlet fiber is 12-14 g.
The click degree of the waste OCC long fiber pulp is 32-36 DEG SR, and the wet weight is 5.5-6.0 g;
the beating degree of the fiber pulp in the waste OCC is 35-40 DEG SR, and the wet weight is 4.5-5.0 g;
the beating degree of the waste OCC fluff pulp is 36-42 DEG SR, and the wet weight is 4.0-4.5 g.
9. The results of the paper index test of the regenerated craft paper are shown in table 16.
Table 16 table of results of test of paper index for regenerated kraft
As shown in Table 16, the usage amount of the wood pulp replaced by the winding drum is 105-112 kg/t, the unit consumption of the surface sizing starch is 33-45 kg/t, and the unit consumption of the dry strength agent is 17-24 kg/t. The indexes of burst resistance, folding resistance and color value of the finished paper all reach the A2 NI-Ka standard.
As can be seen from the results of comprehensive analysis of tables 7 to 16, the finished bovine card papers produced in examples 4 to 13 all meet the quality index requirements of A2 bovine card. Comprehensive investigation shows that the production ration is 95-130 g/cm 2 The finished paper of the ox card produced by the A2 Niu Kashi, the No. 4 and the No. 5 has the advantages of qualified quality and obvious cost; the No. 5 production process has the advantages of more electricity saving, advantages of raw material and power cost, qualified index and lower consumption of chemical auxiliary materials, and is a preferable process. The quantitative ratio in production is 140-210 g/cm 2 In the case of the A2 cattle card, the production process cost of the No. 9 is better, the color of the finished paper is more stable, and the printing performance (ink absorptivity) is better, so that the production process is the preferred process.
95-130 g/cm of the powder is produced by adopting a No. 5 production process 2 The A2 cattle card can save electricity by about 65-70 kwh/t paper, save steam by about 0.08-0.1 t/t paper and save waste paper raw material by 0.03-0.035 t/t paper ton. The output of the paper machine is 45 ten thousand tons/year, the annual energy saving is 2700-3100 ten thousand degrees, the annual energy saving is 3.6-4.5 ten thousand tons, the raw material saving is 1.3-1.5 ten thousand tons, and the energy saving and consumption reducing benefits are obvious.
Adopting 9# production process to produce 140-210 g/cm 2 The A2 cattle card can save electricity by about 60-65 kwh/t paper, save steam by about 0.08-0.1 t/t paper and save waste paper raw material by 0.04-0.045 t/t paper ton. The output of the paper machine is 65 ten thousand tons/year, the electricity can be saved by 3900 to 4200 ten thousand degrees/year, the steam can be saved by 5.2 to 6.5 ten thousand tons/year, and the raw material can be saved by 2.6 to 2.9 ten thousand tons/year.
The preparation method of the regenerated craft paper provided by the invention can produce 95-210 g/cm only by using the A grade and the BC grade of national waste without using American waste and European waste 2 A2 ox card has strong paper strength and stable quality, solves the problem that after national waste paper forbidden to be imported, the national waste OCC is used as a main raw material, and is difficult to produce 95-210 g/cm with the same quality 2 A2 production problem of cattle card. The used recycled domestic OCC waste paper accounts for about 95% of all raw materials, meets the requirements of green recycling economic production, has good social benefit and economic benefit, and can be popularized and applied in the field.
It should be noted that, although the foregoing embodiments have been described herein, the scope of the present invention is not limited thereby. Therefore, based on the innovative concepts of the present invention, alterations and modifications to the embodiments described herein, or equivalent structures or equivalent flow transformations made by the present description and drawings, apply the above technical solution, directly or indirectly, to other relevant technical fields, all of which are included in the scope of the invention.
Claims (5)
1. The regenerated craft paper comprises a surface layer, a core layer and a bottom layer, and is characterized in that the regenerated craft paper is prepared from the following pulp in percentage by weight: 80-95% of national waste OCC pulp and 5-20% of wood pulp;
the raw material of the national OCC pulp is domestic OCC waste paper, and the domestic OCC waste paper comprises 70-80% of national waste A-grade paper and 20-30% of national waste BC-grade paper;
The ration of the regenerated craft paper is 95-130 g/cm 2 The wood pulp is roll-substituted wood pulp, or the wood pulp comprises 10% -20% of unbleached eucalyptus pulp and 80% -90% of roll-substituted wood pulp;
the slurry of the surface layer comprises 25% -35% of first wood pulp and 65% -75% of waste OCC medium-fiber slurry, wherein the first wood pulp comprises 40% -50% of reel-up wood pulp in the wood pulp and other types of slurry components remained in the wood pulp;
the slurry of the core layer comprises 40% -50% of national waste OCC long fiber slurry, 40% -50% of national waste OCC short fiber slurry and 10% -20% of recovered slurry of damaged paper and a cushion layer;
the bottom layer slurry comprises 40% -50% of national waste OCC long fiber slurry, 40% -50% of national waste OCC short fiber slurry and 10% -20% of recovered slurry of damaged paper and cushion layer;
raw materials of the national waste OCC long fiber pulp, the national waste OCC medium fiber pulp and the national waste OCC short fiber pulp comprise domestic OCC waste paper and 50% -60% of reel-substituted wood pulp in the wood pulp; or,
the ration of the regenerated craft paper is 140-210 g/cm 2 The wood pulp comprises 10% -20% of unbleached eucalyptus pulp and 80% -90% of reel substituted wood pulp;
the wood pulp is fully added into the surface layer, and the slurry of the surface layer comprises 30-60% of wood pulp and 40-70% of Chinese waste OCC medium fiber pulp;
The slurry of the core layer comprises 40% -50% of national waste OCC long fiber slurry, 40% -50% of national waste OCC short fiber slurry and 10% -20% of recovered slurry of damaged paper and a cushion layer;
the bottom layer slurry comprises 40% -50% of waste OCC long fiber slurry, 40% -50% of waste OCC short fiber slurry and 10% -20% of recovered slurry of damaged paper and cushion layer.
2. A method for preparing a regenerated kraft liner, which is the regenerated kraft liner of claim 1, comprising the steps of:
s10, preparing waste OCC slurry:
s101: pulp bags with the formula amount and/or domestic OCC waste paper are subjected to feeding, crushing, high-concentration deslagging and coarse screening, and then fiber classification and sorting are carried out to form domestic OCC long fibers, domestic OCC medium fibers and domestic OCC short fibers;
s102: carrying out heavy deslagging, fine screening and multi-disc concentration on the national waste OCC long fiber, and then selectively carrying out disc grinding and pulping to obtain national waste OCC long fiber pulp, and delivering the national waste OCC long fiber pulp to a mixed pulp tank for pulp preparation;
s103: carrying out heavy deslagging, light deslagging, multi-disc concentration and heat dispersion on the fiber in the national waste OCC to obtain fiber pulp in the national waste OCC, and delivering the fiber pulp to a mixed pulp tank for pulp preparation;
s104: the national waste OCC short fiber is subjected to heavy deslagging and multi-disc concentration to obtain national waste OCC short fiber pulp, and the national waste OCC short fiber pulp is sent to a mixed pulp tank for pulp preparation;
S20, preparing wood pulp: pulp is obtained by feeding, crushing, high-concentration deslagging and disc grinding pulping the wood pulp bags with the formula amount, and the wood pulp bags are sent to a mixed pulp tank for pulp preparation; the step S20 is selectively carried out; when 50% -60% of the components of the rolled wood pulp replacing pulp package in the wood pulp are fed into an OCC pulper to be mixed with domestic OCC waste paper for preparing long fiber, medium fiber and short fiber pulp, the balance of 40% -50% of the rolled wood pulp replacing components in the wood pulp is used for preparing surface layer pulp, and the step of S20 of preparing the wood pulp is included, so that the balance of 40% -50% of the rolled wood pulp replacing components are used for preparing the surface layer pulp; when 100% of the reel substituted wood pulp is fully fed into an OCC pulper to be mixed with domestic OCC waste paper for preparing long fiber, medium fiber and short fiber pulp, the step of S20 of preparing wood pulp is not needed, and the step of disc grinding and pulping in S102 is needed;
s30, preparing recycled pulp of the broke and the cushion layer: recovering the damaged paper and the cushion layer to prepare slurry, and delivering the slurry to a mixed slurry pool for slurry preparation;
s40, slurry preparation: preparing slurry according to the formula to obtain surface layer slurry, core layer slurry and bottom layer slurry;
s50, paper making: and (3) enabling the surface layer slurry, the core layer slurry and the bottom layer slurry to flow into a headbox through a slurry filling pump and a pressure screen respectively, then sending the mixture into a net part for net part dehydration forming, and carrying out press dehydration through a press part, drying at a front drying part, surface sizing, drying at a rear drying part, calendaring, coiling and rewinding to prepare the regenerated kraft liner board.
3. The method according to claim 2, wherein the heavy slag removal in steps S102, S103 and S104 is performed by a low-concentration slag remover provided with a pulp-saving device.
4. The method for preparing regenerated craft paper according to claim 2, wherein the step S102 between the fine screening and the multi-disc concentration further comprises the steps of:
and (5) refluxing tailings obtained after fine screening to a crushing stage, and crushing again.
5. The method for producing a regenerated kraft liner of claim 2, wherein in the wood pulp:
the disintegration concentration of unbleached eucalyptus pulp is 4.0-5.0%, the pulping concentration is 4.0-5.0%, the beating degree of a disc mill outlet is 32-36 DEG SR, and the wet weight of disc mill outlet fibers is 2-3 g;
the breaking concentration of the reel substituted wood pulp is 4.0% -5.0%, the pulping concentration is 4.0% -5.0%, the beating degree of the disc mill outlet is 32-36 DEG SR, and the wet weight of the disc mill outlet fiber is 12-14 g.
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| CN114960266A (en) * | 2022-06-16 | 2022-08-30 | 联盛纸业（龙海）有限公司 | Craft paper and preparation method thereof |
| CN115094662A (en) * | 2022-06-16 | 2022-09-23 | 联盛纸业（龙海）有限公司 | Craft paper and preparation method thereof |
| CN115094661A (en) * | 2022-06-16 | 2022-09-23 | 联盛纸业（龙海）有限公司 | Craft paper and preparation method thereof |
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| CN116536968A (en) * | 2023-04-07 | 2023-08-04 | 玖龙纸业（东莞）有限公司 | Method for manufacturing high-grade packaging paper by mixing Gao Kajiang with waste paper and pulping |
| CN116752384A (en) * | 2023-06-21 | 2023-09-15 | 联盛纸业（龙海）有限公司 | Coated craft paper and preparation method thereof |
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