CN113123173A - Natural color machine pulp high-loose white board paper and production technology - Google Patents
Natural color machine pulp high-loose white board paper and production technology Download PDFInfo
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- CN113123173A CN113123173A CN202110437338.3A CN202110437338A CN113123173A CN 113123173 A CN113123173 A CN 113123173A CN 202110437338 A CN202110437338 A CN 202110437338A CN 113123173 A CN113123173 A CN 113123173A
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- 238000004519 manufacturing process Methods 0.000 title abstract description 14
- 238000005516 engineering process Methods 0.000 title abstract description 10
- 239000010410 layer Substances 0.000 claims abstract description 56
- 239000012792 core layer Substances 0.000 claims abstract description 48
- 239000002344 surface layer Substances 0.000 claims abstract description 44
- 238000004061 bleaching Methods 0.000 claims abstract description 36
- 239000000126 substance Substances 0.000 claims abstract description 29
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 23
- 239000011247 coating layer Substances 0.000 claims abstract description 17
- 239000000123 paper Substances 0.000 claims description 47
- 239000002023 wood Substances 0.000 claims description 39
- 239000011248 coating agent Substances 0.000 claims description 36
- 238000000576 coating method Methods 0.000 claims description 36
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 34
- 238000004537 pulping Methods 0.000 claims description 22
- 238000002156 mixing Methods 0.000 claims description 20
- 239000011121 hardwood Substances 0.000 claims description 18
- 238000002791 soaking Methods 0.000 claims description 18
- 239000011122 softwood Substances 0.000 claims description 18
- 238000003825 pressing Methods 0.000 claims description 15
- 238000000227 grinding Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 14
- 239000011087 paperboard Substances 0.000 claims description 13
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 12
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 7
- 239000004115 Sodium Silicate Substances 0.000 claims description 5
- 238000004026 adhesive bonding Methods 0.000 claims description 5
- 239000002738 chelating agent Substances 0.000 claims description 5
- 230000014759 maintenance of location Effects 0.000 claims description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 5
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims 1
- 239000010893 paper waste Substances 0.000 abstract description 10
- 239000000835 fiber Substances 0.000 abstract description 5
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 238000005406 washing Methods 0.000 description 12
- 239000007788 liquid Substances 0.000 description 9
- 238000004806 packaging method and process Methods 0.000 description 9
- 239000002345 surface coating layer Substances 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 4
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- 238000012216 screening Methods 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 208000035143 Bacterial infection Diseases 0.000 description 1
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- 239000007844 bleaching agent Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 238000004090 dissolution Methods 0.000 description 1
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- 238000004134 energy conservation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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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
-
- 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
- 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
- D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
-
- 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
- D21H19/80—Paper comprising more than one coating
- D21H19/82—Paper comprising more than one coating superposed
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Paper (AREA)
Abstract
The invention provides a natural color machine pulp high-loose white board, which adopts raw paper divided into a surface layer, a core layer and a bottom layer which are manufactured by papermaking, or a surface layer and a core layer which are manufactured by two layers, wherein the surface layer and the bottom layer adopt mixed chemical pulp, the core layer adopts natural color machine pulp and broke paper, the surface layer is provided with a coating layer, and the bottom layer is not coated or coated. The production technology uses the natural color machine pulp, reduces the dosage of bleaching chemicals, reduces environmental pollution, replaces waste paper pulp, and can ensure the strength of fiber to the maximum extent while improving the yield of the chemical machine pulp and keeping the bulk of the chemical machine pulp. The invention also provides a production technology of the high-loose white board paper by the natural color machine pulp.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to natural color machine pulp high-elasticity white board paper.
Background
The coated paper technology is a process for coating a layer of coating on base paper to make the paper have better optical properties and printing performance. The production raw materials of the coated grey white board paper and the coated kraft board paper are mainly waste paper, special waste paper production line equipment is needed in use, 5% -10% of impurities are discharged, and subsequent harmless treatment is needed. The production operation environment is poor, the problems of dust pollution, bacterial infection and the like exist, the health of operation personnel is influenced, and occupational diseases are easy to cause. With the improvement of environmental protection requirements and the tightening of pollution control, the capacity of a large amount of grey-bottom white board paper is cleared, and a large gap appears in the market of the grey-bottom white board. In addition, the environmental protection pressure of the secondary fiber is high, and the inlet amount of waste paper raw materials is gradually reduced year by year. The limitation of the amount of import has greatly reduced the production of grey white board, and therefore cleaner and more environmentally friendly resources are required to replace the waste paper.
In addition, the traditional white board with coated ash bottom is generally made by four-layer net papermaking, the surface layer adopts bleached chemical wood pulp or deinked waste paper pulp, the lining layer/core layer/bottom layer is waste paper pulp, and the bulk is only 1.15-1.25cm3(ii) in terms of/g. In addition, stiffness is one of the most important properties of the paperboard, and the coated gray-based white board has a lower thickness and the stiffness is proportional to the square of the thickness at the same basis weight, so that a higher basis weight coated gray-based white board can be replaced by a lower basis weight high-bulk coated white board without affecting packaging performance and post-processing performance. And the high-loose coated white board adopts cleaner and more environment-friendly chemi-mechanical pulp to replace waste paper pulp in the coated grey-bottom white board. In addition, the core layer chemi-mechanical pulp of the common coated white card has high whiteness, the consumption of bleaching chemicals in the production process of the chemi-mechanical pulp is large, the damage to fibers is large, the bulk advantage of the chemi-mechanical pulp is reduced, the COD content in an effluent system of the chemi-mechanical pulp is increased, and the environmental protection pressure is increased.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the high-volume white paperboard of the chemi-mechanical pulp, which reduces the dosage of bleaching chemicals, reduces environmental pollution, removes the waste paper treatment capacity, and can ensure the strength of fibers to the greatest extent while improving the yield of the chemi-mechanical pulp and keeping the bulk of the chemi-mechanical pulp.
In order to achieve the purpose, the raw paper adopted by the high-volume white paperboard with the natural color machine pulp comprises a surface layer, a core layer and a bottom layer, or the surface layer and the core layer are manufactured by two layers, the surface layer and the bottom layer adopt mixed chemical pulp, the core layer adopts the natural color machine pulp and broke, the surface layer is provided with a coating layer, and the back surface of the bottom layer is provided with the coating layer or is not coated with the coating layer.
Further, the mixed chemical pulp of the surface layer and the bottom layer comprises bleached softwood pulp and bleached hardwood pulp, the weight proportion of the bleached softwood pulp is within 50%, the weight proportion of the bleached hardwood pulp is 50% -100%, and the whiteness of the bleached softwood pulp and the bleached hardwood pulp is 65% -90% ISO.
Furthermore, the weight proportion of the natural color machine pulp in the core layer is 70-90%, the weight proportion of the broke in the core layer is 10-30%, and the whiteness of the natural color machine pulp is 25-65% ISO.
Furthermore, the gram weight of the surface layer is 15 grams per square meter to 50 grams per square meter, and the gram weight of the bottom layer is within 40 grams per square meter.
Further, the coating layer of the surface layer comprises a pre-coating layer, a middle coating layer and a surface coating layer, the coating amount of the coating layer of the surface layer is 20 to 55 grams per square meter, and the coating amount of the coating layer on the back surface of the bottom layer is within 25 grams per square meter.
The invention also provides a production technology of the high-loose white board paper by the natural color machine pulp, which comprises the following steps:
s1: the method comprises the following steps of core layer pulping, wherein raw material wood chips are washed, presoaked, ground into pulp, lightly bleached (or unbleached), screened and washed to obtain natural color machine pulp, and then pulp blending is carried out on paper edges and broken paper generated by papermaking and the natural color machine pulp to obtain core layer pulp;
s2: pulping the surface layer/bottom layer, namely pulping the raw material pulp board, removing impurities, grinding the pulp into pulp, then mixing the pulp, and adding chemicals through a flow system to obtain surface layer/bottom layer pulp;
s3: papermaking of a paper board, namely forming a surface layer, a core layer and a bottom layer on a net, and then squeezing, dehydrating, drying, gluing and hard pressing to obtain raw paper;
s4: coating, namely performing three-layer coating on the surface layer of the base paper, not coating or coating once on the back surface of the bottom layer of the base paper, and coiling after soft pressing to obtain a finished product.
Further, in step S1, the bleaching chemicals used in the pre-soaking step per ton of unbleached pulp include 5kg to 28kg of liquid alkali, and the bleaching chemicals used in the light bleaching step include 0kg to 10kg of liquid alkali, 0kg to 25kg of hydrogen peroxide, 0kg to 10kg of sodium silicate, 0kg to 5kg of a bleaching control agent, and 0kg to 4kg of a chelating agent.
Further, in step S3, the wet end chemicals used include a filter aid in an amount of 0 to 500PPM, a retention aid in an amount of 0 to 500PPM, and a dry strength agent in an amount of 0 to 35kg per ton of paper.
The high-density white board paper of the natural color machine pulp reduces the dosage of bleaching chemicals, reduces environmental pollution, removes waste paper treatment capacity, and can ensure the strength of fiber to the greatest extent while improving the yield of the chemical machine pulp and keeping the bulk of the chemical machine pulp.
Drawings
The present invention will be further described and illustrated with reference to the following drawings.
FIG. 1 is a flow chart of a process for producing a brown stock high-bulk paper in accordance with a preferred embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be more clearly and completely explained by the description of the preferred embodiments of the present invention with reference to the accompanying drawings.
Example 1: the production technology of the high-elasticity white board paper of the color machine pulp comprises the following steps:
s1: core layer pulping, namely washing raw material wood chips in a wood chip washing machine, then pre-soaking the wood chips through a vertical pre-soaking device, adding liquid caustic soda according to the weight of 5kg per ton during pre-soaking to pre-treat the wood chips, grinding the wood chips into pulp by a high-concentration mill and grinding the wood chips into pulp by a low-concentration mill after the pre-soaking is finished, finally washing the wood chips by a plurality of discs, feeding the pulp into a pulp tower of a chemical machine, and injecting the pulp of the chemical machine into a core layer pulp mixing pool; the paper edge and broken paper produced in the paper making process are fed into a mill to be ground into pulp, the obtained pulp is injected into a core layer pulp blending pool, and the pulp flows into a core layer pulp flowing box after being blended.
S2: pulping the surface layer/bottom layer, namely pulping bleached softwood pulp (NBKP) board and bleached hardwood pulp (LBKP) board respectively through pulping, impurity removal and grinding by a mill, then adding the bleached hardwood pulp into a surface layer/bottom layer pulp distribution tank respectively, wherein the weight ratio of the bleached hardwood pulp is 100%, and feeding the pulp into a surface layer/bottom layer pulp box respectively after pulp mixing. In addition, the bleached softwood pulp and the bleached hardwood pulp after the pulp refining are partially added into a core layer pulp blending pool to participate in the core layer pulp blending.
S3: the paper board is manufactured, the surface layer, the core layer and the bottom layer are molded by netting, and then the steps of squeezing dehydration, pre-drying, gluing, post-drying and hard pressing are carried out in sequence. The gram weight of the obtained surface layer is 30 g/square meter, and the gram weight of the bottom layer is 20 g/square meter.
S4: and (3) coating after the hard pressing is finished, wherein a surface coating layer comprises precoating, middle coating and top coating, the coating quantity is 55 g/square meter, and the back of the bottom layer is not coated. After coating, sequentially carrying out soft pressing, reeling, rewinding and packaging, then warehousing, and after rewinding, carrying out flat plate slitting on part of products, then packaging and warehousing.
Example 2: the production technology of the high-elasticity white board paper of the color machine pulp comprises the following steps:
s1: core layer pulping, namely washing raw material wood chips in a wood chip washing machine, then pre-soaking the wood chips through a vertical pre-soaking device, adding liquid caustic soda into the wood chips according to the weight of 28kg per ton during pre-soaking to pre-treat the wood chips, grinding the wood chips into pulp by a high-concentration mill after pre-soaking is finished, bleaching the wood chips in a bleaching tower, wherein bleaching chemicals in the bleaching tower comprise 10kg of liquid caustic soda, 25kg of hydrogen peroxide, 10kg of sodium silicate, 5.0kg of a bleaching control agent and 2kg of a chelating agent, grinding the wood chips into pulp by a low-concentration mill after light bleaching, screening and washing the wood chips by a plurality of discs, then feeding the wood chips into a chemi-mechanical pulp; the paper edge and broken paper produced in the paper making process are fed into a mill to be ground into pulp, the obtained pulp is injected into a core layer pulp blending pool, and the pulp flows into a core layer pulp flowing box after being blended.
S2: pulping the surface layer/bottom layer, namely pulping bleached softwood pulp (NBKP) board and bleached hardwood pulp (LBKP) board respectively through pulping, impurity removal and grinding by a mill, then adding the bleached softwood pulp into a surface layer/bottom layer pulp preparation tank respectively, wherein the weight ratio of the bleached softwood pulp is 100%, and after pulp preparation, respectively entering a surface layer/bottom layer pulp flow box. In addition, the bleached softwood pulp and the bleached hardwood pulp after the pulp refining are partially added into a core layer pulp blending pool to participate in the core layer pulp blending.
S3: the paper board is manufactured, the surface layer, the core layer and the bottom layer are molded by netting, and then the steps of squeezing dehydration, pre-drying, gluing, post-drying and hard pressing are carried out in sequence. The gram weight of the obtained surface layer is 15 g/square meter, and the gram weight of the bottom layer is 40 g/square meter.
S4: and (3) coating after the hard pressing is finished, wherein the surface coating layer comprises precoating, middle coating and top coating, the coating quantity is 20 g/square meter, and the coating quantity of the coating layer on the back surface of the bottom layer is 20 g/square meter. After coating, sequentially carrying out soft pressing, reeling, rewinding and packaging, then warehousing, and after rewinding, carrying out flat plate slitting on part of products, then packaging and warehousing.
In addition, the wet end chemicals used primarily in the papermaking process included 500PPM of drainage aid, 500PPM of retention aid and 35kg of dry strength agent per ton of paper.
Example 3: the production technology of the high-elasticity white board paper of the color machine pulp comprises the following steps:
s1: core layer pulping, namely washing raw material wood chips in a wood chip washing machine, then pre-soaking the wood chips through a vertical pre-soaking device, adding liquid caustic soda into the wood chips according to the weight of 28kg per ton during pre-soaking to pre-treat the wood chips, grinding the wood chips into pulp by a high-concentration mill after pre-soaking is finished, bleaching the wood chips in a bleaching tower, wherein bleaching chemicals in the bleaching tower comprise 10kg of liquid caustic soda, 25kg of hydrogen peroxide, 10kg of sodium silicate, 5.0kg of a bleaching control agent and 2kg of a chelating agent, grinding the wood chips into pulp by a low-concentration mill after light bleaching, screening and washing the wood chips by a plurality of discs, then feeding the wood chips into a chemi-mechanical pulp; the paper edge and broken paper produced in the paper making process are fed into a mill to be ground into pulp, the obtained pulp is injected into a core layer pulp blending pool, and the pulp flows into a core layer pulp flowing box after being blended.
S2: pulping the surface layer, namely pulping bleached softwood pulp (NBKP) board and bleached hardwood pulp (LBKP) board respectively through pulping, impurity removal and grinding by a mill, then adding the pulp into a surface layer pulp blending tank respectively, wherein the weight ratio of the bleached softwood pulp is 40%, the weight ratio of the bleached hardwood pulp is 60%, and after pulp blending, feeding the pulp into a surface layer pulp box (the bottom layer is not blended). In addition, the bleached softwood pulp and the bleached hardwood pulp after the pulp refining are partially added into a core layer pulp blending pool to participate in the core layer pulp blending.
S3: the paper board is manufactured, the surface layer and the core layer are molded on the net, and then the paper board is sequentially pressed, dehydrated, pre-dried, glued, post-dried and hard pressed. The obtained surface layer has the gram weight of 50 g/square meter and the bottom layer is not starched.
S4: and (3) coating after the hard pressing is finished, wherein a surface coating layer comprises precoating, middle coating and top coating, the coating quantity is 55 g/square meter, and the back of the bottom layer is not coated. After coating, sequentially carrying out soft pressing, reeling, rewinding and packaging, then warehousing, and after rewinding, carrying out flat plate slitting on part of products, then packaging and warehousing.
In addition, the wet end chemicals used primarily in the papermaking process included a 500PPM amount of drainage aid, 500PPM of retention aid, and 35kg of dry strength agent per ton of paper.
Example 4: the production technology of the high-elasticity white board paper of the color machine pulp comprises the following steps:
s1: core layer pulping, namely washing raw material wood chips in a wood chip washing machine, then pre-soaking the wood chips through a vertical pre-soaking device, adding liquid caustic soda into the wood chips according to the weight of 20kg per ton during pre-soaking to pre-treat the wood chips, grinding the wood chips into pulp by a high-concentration mill after pre-soaking is finished, bleaching the wood chips in a bleaching tower, wherein bleaching chemicals in the bleaching tower comprise 5kg of liquid caustic soda, 18kg of hydrogen peroxide, 5kg of sodium silicate, 2.5kg of a bleaching control agent and 1kg of a chelating agent, grinding the wood chips into pulp by a low-concentration mill after light bleaching, screening and washing the wood chips by a plurality of discs, then feeding the wood chips into a chemi-mechanical pulp; the paper edge and broken paper produced in the paper making process are fed into a mill to be ground into pulp, the obtained pulp is injected into a core layer pulp blending pool, and the pulp flows into a core layer pulp flowing box after being blended.
S2: pulping the surface layer/the bottom layer, namely pulping bleached softwood pulp (NBKP) boards and bleached hardwood pulp (LBKP) boards respectively through pulping, impurity removal and grinding by a mill, then adding the pulp into a surface layer/bottom layer pulp preparation tank respectively, preparing pulp according to the proportion, wherein the weight proportion of the bleached softwood pulp is 50%, the weight proportion of the bleached hardwood pulp is 50%, and the pulp is mixed and then enters a surface layer/bottom layer pulp flowing box respectively. In addition, the bleached softwood pulp and the bleached hardwood pulp after the pulp refining are partially added into a core layer pulp blending pool to participate in the core layer pulp blending.
S3: the paper board is manufactured, the surface layer, the core layer and the bottom layer are molded by netting, and then the steps of squeezing dehydration, pre-drying, gluing, post-drying and hard pressing are carried out in sequence. The gram weight of the obtained surface layer is 25g per square meter, and the gram weight of the bottom layer is 20g per square meter.
S4: and (3) coating after the hard pressing is finished, wherein the surface coating layer comprises precoating, middle coating and top coating, the coating quantity is 40g per square meter, and the coating quantity of the coating layer on the back surface of the bottom layer is 10g per square meter. After coating, sequentially carrying out soft pressing, reeling, rewinding and packaging, then warehousing, and after rewinding, carrying out flat plate slitting on part of products, then packaging and warehousing.
In addition, the wet end chemicals used primarily in the papermaking process included a drainage aid in an amount of 250PPM, a retention aid of 250PPM, and a dry strength agent of 15kg per ton of paper.
Example 5: the difference from example 4 is that the thickness of the finished high-bulk brown paper product of the present chemi-mechanical pulp is 424 um.
Example 6: the difference from example 4 is that the thickness of the finished high-bulk brown paper product of the present chemi-mechanical pulp is 485 um.
Through repeated experiments, the bulk of the high-bulk white paperboard of the natural color machine pulp can reach 1.30cm3/g～1.55cm3And in the case of high bulk, the stiffness and folding resistance of the paper are ensured.
The performance test is carried out on any embodiment of the invention and the traditional grey white board under the same thickness, the embodiment and the comparative example are correspondingly sorted in sequence by the similar thickness and are divided into 6 groups, and the like, and the sorted test results are shown in table 1.
TABLE 1 paper Performance index
In addition, the natural color machine pulp has the characteristics that a small amount of bleaching chemicals are used, the whiteness of the chemical machine pulp is between 25% and 65% ISO, the amount of the chemicals used in the bleaching process is greatly reduced, and the specific data comparison condition is shown in Table 2.
TABLE 2 comparison of bleaching chemical usage
In conclusion, the high-loose white board made of the natural color machine pulp mainly adopts the natural color machine pulp as the core layer filling pulp to replace the lining layer and the core layer of the coated grey-bottom white board. Compared with the bleaching machine pulp, the bleaching machine pulp has the advantages that the dosage of bleaching agents (caustic soda, hydrogen peroxide and the like) is greatly reduced, and the dissolution of lignin and COD treatment load are reduced, so that the yield and the bulk of the bleaching machine pulp are improved, the cost of pollution discharge treatment is reduced, and the aims of energy conservation and environmental protection are fulfilled. The market gap of the grey white board is made up, the iterative upgrade of the original product category is realized, and the clean and environment-friendly natural color machine pulp high-elasticity white board is provided to replace the grey white board.
The above detailed description merely describes preferred embodiments of the present invention and does not limit the scope of the invention. Without departing from the spirit and scope of the present invention, it should be understood that various changes, substitutions and alterations can be made herein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. The scope of the invention is defined by the claims.
Claims (8)
1. The raw paper adopted by the high-density white paperboard is characterized by comprising a surface layer, a core layer and a bottom layer or manufactured by two layers of the surface layer and the core layer, wherein the surface layer and the bottom layer adopt mixed chemical pulp, the core layer adopts the high-density white paperboard prepared from the high.
2. The brown stock of claim 1, wherein the blend of chemical pulps in the top and bottom layers comprises bleached softwood pulp and bleached hardwood pulp, the bleached softwood pulp being present in an amount within 50% by weight, the bleached hardwood pulp being present in an amount within 50% by weight and the bleached softwood pulp and bleached hardwood pulp having a brightness in the range of 65% to 90% ISO.
3. The brown stock of claim 1, wherein the weight ratio of the unbleached machine pulp in the core layer is 70-90%, the weight ratio of the broke in the core layer is 10-30%, and the whiteness of the unbleached machine pulp is 25-65% ISO.
4. The grey board of the present invention, according to claim 1, wherein the grammage of the face layer is from 15 grams per square meter to 50 grams per square meter and the grammage of the bottom layer is within 40 grams per square meter.
5. The grey board of the present invention is characterized in that the coating layer of the face layer comprises a pre-coating layer, a middle coating layer and a face coating layer, the coating amount of the coating layer of the face layer is 20-55 g/square meter, and the coating amount of the coating layer on the back surface of the bottom layer is within 25 g/square meter.
6. The process for producing brown stock of any one of claims 1 to 5, comprising the steps of:
s1: the method comprises the following steps of core layer pulping, wherein raw material wood chips are washed, presoaked, ground into pulp, lightly bleached (or unbleached), screened and washed to obtain natural color machine pulp, and then pulp blending is carried out on paper edges and broken paper generated by papermaking and the natural color machine pulp to obtain core layer pulp;
s2: pulping the surface layer/bottom layer, namely pulping the raw material pulp board, removing impurities, grinding the pulp into pulp, then mixing the pulp, and adding chemicals through a flow system to obtain surface layer/bottom layer pulp;
s3: papermaking of a paper board, namely forming a surface layer, a core layer and a bottom layer on a net, and then squeezing, dehydrating, drying, gluing and hard pressing to obtain raw paper;
s4: coating, namely performing three-layer coating on the surface layer of the base paper, not coating or coating once on the back surface of the bottom layer of the base paper, and coiling after soft pressing to obtain a finished product.
7. The grey board according to claim 6, wherein in step S1, the bleaching chemicals used in the pre-soaking step include 5kg to 28kg of caustic soda lye per ton of grey board, and the bleaching chemicals used in the light bleaching step include 0kg to 10kg of caustic soda lye, 0kg to 25kg of hydrogen peroxide, 0kg to 10kg of sodium silicate, 0kg to 5kg of a bleaching control agent, and 0kg to 4kg of a chelating agent.
8. The process of claim 7, wherein the wet end chemicals used in step S3 include a filter aid in an amount of 0 to 500PPM, a retention aid in an amount of 0 to 500PPM, and a dry strength agent in an amount of 0 to 35kg per ton of paper.
Priority Applications (1)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114318952A (en) * | 2021-12-29 | 2022-04-12 | 江苏博汇纸业有限公司 | Method for manufacturing white board with high broadleaf pulp content |
| CN114351486A (en) * | 2021-12-30 | 2022-04-15 | 江苏博汇纸业有限公司 | Formula anti-scaling chemi-mechanical pulp line production system is added to plain boiled water back end |
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| CN114318952A (en) * | 2021-12-29 | 2022-04-12 | 江苏博汇纸业有限公司 | Method for manufacturing white board with high broadleaf pulp content |
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