CN109457545B - Production process of high-brightness kraft liner board - Google Patents
Production process of high-brightness kraft liner board Download PDFInfo
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- CN109457545B CN109457545B CN201811214894.9A CN201811214894A CN109457545B CN 109457545 B CN109457545 B CN 109457545B CN 201811214894 A CN201811214894 A CN 201811214894A CN 109457545 B CN109457545 B CN 109457545B
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- slurry
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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
- B32B29/005—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 next to another layer of paper or cardboard layer
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
- D21C9/1084—Bleaching ; Apparatus therefor with reducing compounds
-
- 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
- D21H11/14—Secondary fibres
-
- 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
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/16—Sizing or water-repelling agents
-
- 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
- D21H27/10—Packing paper
-
- 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
- B32B2250/00—Layers arrangement
- B32B2250/26—All layers being made of paper or paperboard
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
The present invention relates to the papermaking industry. The invention provides a production process of a high-brightness kraft liner board, which directly uses 100% of national wastes as production raw materials, does not need to rely on imported waste paper to improve the brightness of finished paper, and completely uses the national wastes to produce the kraft liner board with the brightness reaching the industrial standard on the premise of the national restriction on the import of the waste paper, so that domestic papermaking gets rid of the dependence on the imported waste paper; the reducing bleaching agent which is prepared by mixing liquid sodium borohydride and 40% sodium bisulfite according to the proportion of 1:10 is used for bleaching surface layer pulp, sodium thiosulfate produced after the liquid sodium borohydride and the sodium bisulfite react has reducibility, can degrade pigments in the pulp, has mild property and less damage to waste paper fibers, and therefore, the quality of finished paper can be ensured not to be reduced due to the damage to the fibers in the bleaching process by using the reducing bleaching agent for bleaching.
Description
Technical Field
The invention relates to a papermaking process, in particular to a production process of a high-brightness kraft liner board.
Background
In order to respond to the national environmental protection policy, the country limits the import of foreign waste paper from 2018, completely forbids the import of waste paper from 2020, so as to cause the shortage of high-quality fiber raw materials, under the current collocation form of waste paper raw materials mainly comprising national waste (namely domestic waste paper), the original L value (brightness value) of liner pulp of kraft liner board paper can only be controlled within the range of 63.5 to 65, the L value of finished paper can generally reach the range of 57 to 58.5 (the L value has larger deviation under different vehicle speeds) after the pulp is dyed, sized and dried on a paper machine, the brightness value of the finished paper has some L value industrial standards which can not reach 58.2, the brightness of raw materials can be improved by adding imported European waste into the liner pulp raw materials in the past, but with the strict control of the country on the imported waste paper raw materials, the regulation means of imported waste paper are increasingly limited, if effective regulation measures of the brightness of raw materials are not adopted, the finished paper can not meet the requirements of the industry standard. Therefore, it is necessary to provide a new production process for producing a kraft liner board having an L value suitable for the industrial standard from domestic waste without depending on imported waste paper.
Disclosure of Invention
The invention provides a production process of a high-brightness kraft liner board, aiming at solving the technical problem that the kraft liner board with an L value suitable for the industry standard is produced by using national wastes as raw materials on the premise of not depending on imported waste paper. The technical scheme of the invention is as follows:
the production process of the high-brightness kraft liner board comprises a surface layer, a core layer and a bottom layer, and comprises the following specific steps:
a. the method comprises the following steps of preparing slurry by using national wastes as raw materials through purification, screening and concentration treatment, and dividing the slurry into surface layer slurry and core layer and bottom layer slurry;
b. mixing the surface layer slurry with a reduction bleaching agent for more than one hour, wherein the reduction bleaching agent comprises the components of liquid sodium borohydride and 40% sodium bisulfite which are mixed according to the proportion of 1:10, and the addition amount of the reduction bleaching agent in each ton of the surface layer slurry is 1-3.5 kg;
c. uniformly distributing the surface layer slurry to a surface layer forming net for dehydration to prepare the surface layer; uniformly distributing the core layer slurry and the bottom layer slurry to a core layer forming net and a bottom layer forming net for dewatering to respectively prepare the core layer and the bottom layer;
d. firstly, compounding the surface layer and the core layer, and then compounding the core layer and the bottom layer to form a three-layer paper sheet;
e. after vacuum dehydration of a net part, the dryness of the paper sheet reaches 20-22%, transferring the paper sheet to a pressing part through a vacuum paper guide roll for secondary extrusion dehydration, wherein the dryness of the paper sheet reaches 46-48%, and finally drying through a plurality of drying cylinders, wherein the dryness of the paper sheet reaches 90-95%;
f. carrying out surface sizing treatment on a double-roller soaking type sizing machine;
g. drying by a plurality of drying cylinders until the dryness of the paper sheet reaches 90-92%, finishing by a calender, and finally rolling into paper by a winder.
Further, the amount of the reducing bleaching agent added in the step b is 3kg per ton of the surface layer slurry.
Further, the gram weight of the surface layer slurry is 28-32 g.
Further, the glue application amount of the surface glue application in the step f is 4-6 g/m2。
Further, waste is added into the raw materials of the step a. The paper strength can be improved by adding a proper amount of paper waste, so that the quality of the finished paper is improved.
The invention has the beneficial effects that: the invention provides a production process of a high-brightness kraft liner board, which directly uses 100% of national wastes as production raw materials, does not need to rely on imported waste paper to improve the brightness of finished paper, and completely uses the national wastes to produce the kraft liner board with the brightness reaching the industrial standard on the premise of the national restriction on the import of the waste paper, so that domestic papermaking gets rid of the dependence on the imported waste paper; the reducing bleaching agent which is prepared by mixing liquid sodium borohydride and 40% sodium bisulfite according to the proportion of 1:10 is used for bleaching surface layer pulp, sodium thiosulfate produced after the liquid sodium borohydride and the sodium bisulfite react has reducibility, can degrade pigments in the pulp, has mild property and less damage to waste paper fibers, and therefore, the quality of finished paper can be ensured not to be reduced due to the damage to the fibers in the bleaching process by using the reducing bleaching agent for bleaching.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments in order to provide a further understanding of the nature and technical means of the invention, as well as the specific objects and functions attained.
The production process of the high-brightness kraft liner board comprises a surface layer, a core layer and a bottom layer, and comprises the following specific steps:
a. the method comprises the following steps of preparing slurry by using national wastes as raw materials through purification, screening and concentration treatment, and dividing the slurry into surface layer slurry and core layer and bottom layer slurry;
b. mixing the surface layer slurry with a reduction bleaching agent for more than one hour, wherein the reduction bleaching agent comprises the components of liquid sodium borohydride and 40% sodium bisulfite which are mixed according to the proportion of 1:10, and the addition amount of the reduction bleaching agent in each ton of the surface layer slurry is 1-3.5 kg;
c. uniformly distributing the surface layer slurry to a surface layer forming net for dehydration to prepare the surface layer; uniformly distributing the core layer slurry and the bottom layer slurry to a core layer forming net and a bottom layer forming net for dewatering to respectively prepare the core layer and the bottom layer;
d. firstly, compounding the surface layer and the core layer, and then compounding the core layer and the bottom layer to form a three-layer paper sheet;
e. after vacuum dehydration of a net part, the dryness of the paper sheet reaches 20-22%, transferring the paper sheet to a pressing part through a vacuum paper guide roll for secondary extrusion dehydration, wherein the dryness of the paper sheet reaches 46-48%, and finally drying through a plurality of drying cylinders, wherein the dryness of the paper sheet reaches 90-95%;
f. carrying out surface sizing treatment on a double-roller soaking type sizing machine;
g. drying by a plurality of drying cylinders until the dryness of the paper sheet reaches 90-92%, finishing by a calender, and finally rolling into paper by a winder.
Further, the amount of the reducing bleaching agent added in the step b is 2kg per ton of the surface layer slurry.
Further, the gram weight of the surface layer slurry is 28-32 g.
Further, the glue application amount of the surface glue application in the step f is 4-6 g/m2。
Further, waste is added into the raw materials of the step a. The paper strength can be improved by adding a proper amount of paper waste, so that the quality of the finished paper is improved.
Example 1:
a. 100% of domestic waste is used as a raw material, and is prepared into slurry through purification, screening and concentration treatment, and the slurry is divided into surface layer slurry, core layer slurry and bottom layer slurry;
b. mixing the surface layer pulp with a reduction bleaching agent for more than one hour, wherein the reduction bleaching agent comprises the components of liquid sodium borohydride and 40% sodium bisulfite which are mixed according to the proportion of 1:10, and the addition amount of the reduction bleaching agent in each ton of the surface layer pulp is 3.5 kg;
c. uniformly distributing the surface layer slurry to a surface layer forming net for dewatering to prepare the surface layer, wherein the amount of the surface layer slurry is 28g/m2(ii) a Uniformly distributing the core layer slurry and the bottom layer slurry to a core layer forming net and a bottom layer forming net for dewatering to respectively prepare the core layer and the bottom layer; the vehicle speed is 690 m/min;
d. firstly, compounding the surface layer and the core layer, and then compounding the core layer and the bottom layer to form a three-layer paper sheet;
e. after vacuum dehydration of a net part, the dryness of the paper sheet reaches 20-22%, transferring the paper sheet to a pressing part through a vacuum paper guide roll for secondary extrusion dehydration, wherein the dryness of the paper sheet reaches 46-48%, and finally drying through a plurality of drying cylinders, wherein the dryness of the paper sheet reaches 90-95%;
f. carrying out surface sizing treatment on a double-roller soaking type sizing machine;
g. drying by a plurality of drying cylinders until the dryness of the paper sheet reaches 90-92%, finishing by a calender, and finally rolling into paper by a winder.
The final L value of the facing was 58.92.
Example 2:
the amount of the reducing bleaching agent added to each ton of the surface layer pulp in the step b is 3kg, the vehicle speed in the step c is 763m/min, and other steps are the same as those in the embodiment 1.
The final L value of the facing was 58.32.
Example 3:
the amount of the reducing bleaching agent added to each ton of the surface layer pulp in the step b is 3kg, the vehicle speed in the step c is 789m/min, and other steps are the same as those in the embodiment 1.
The final L value of the top sheet was 58.23.
Example 4:
the amount of the reducing bleaching agent added to each ton of the surface layer pulp in the step b is 3.2kg, the vehicle speed in the step c is 723m/min, and other steps are the same as those in the example 1.
The final L value of the facing was 58.35.
Example 5:
the amount of the reducing bleaching agent added per ton of the surface layer pulp in the step b is 3kg, the vehicle speed in the step c is 731m/min, and other steps are the same as those in the embodiment 1.
The final L value of the top sheet was 58.27.
From the above examples 1-5, it is known that the L value of the finished paper after adding the reducing bleaching agent is higher than the standard value of 58.2, wherein the L value of the finished paper can meet the standard value when adding the reducing bleaching agent in an amount of 3 kg/ton.
The invention has the beneficial effects that: the invention provides a production process of a high-brightness kraft liner board, which directly uses 100% of national wastes as production raw materials, does not need to rely on imported waste paper to improve the brightness of finished paper, and completely uses the national wastes to produce the kraft liner board with the brightness composite industrial standard on the premise that the country restricts the import of the waste paper, so that domestic papermaking gets rid of the dependence on the imported waste paper; the reducing bleaching agent which is prepared by mixing liquid sodium borohydride and 40% sodium bisulfite according to the proportion of 1:10 is used for bleaching surface layer pulp, sodium thiosulfate produced after the liquid sodium borohydride and the sodium bisulfite react has reducibility, can degrade pigments in the pulp, has mild property and less damage to waste paper fibers, and therefore, the quality of finished paper can be ensured not to be reduced due to the damage to the fibers in the bleaching process by using the reducing bleaching agent for bleaching.
Claims (4)
1. The production process of the high-brightness kraft liner board comprises a surface layer, a core layer and a bottom layer, and is characterized by comprising the following specific steps of:
a. 100% of domestic waste is used as a raw material, and is prepared into slurry through purification, screening and concentration treatment, and the slurry is divided into surface layer slurry, core layer slurry and bottom layer slurry;
b. mixing the surface layer slurry with a reduction bleaching agent for more than one hour, wherein the reduction bleaching agent comprises the components of liquid sodium borohydride and 40% sodium bisulfite which are mixed according to the proportion of 1:10, and the addition amount of the reduction bleaching agent in each ton of the surface layer slurry is 3-3.5 kg;
c. uniformly distributing the surface layer slurry to a surface layer forming net for dehydration to prepare the surface layer; uniformly distributing the slurry of the core layer and the slurry of the bottom layer to a core layer forming net and a bottom layer forming net for dewatering to respectively prepare the core layer and the bottom layer, wherein the speed is 690-789 m/min;
d. firstly, compounding the surface layer and the core layer, and then compounding the core layer and the bottom layer to form a three-layer paper sheet;
e. after vacuum dehydration of a net part, the dryness of the paper sheet reaches 20-22%, transferring the paper sheet to a pressing part through a vacuum paper guide roll for secondary extrusion dehydration, wherein the dryness of the paper sheet reaches 46-48%, and finally drying through a plurality of drying cylinders, wherein the dryness of the paper sheet reaches 90-95%;
f. carrying out surface sizing treatment on a double-roller soaking type sizing machine;
g. drying by a plurality of drying cylinders until the dryness of the paper sheet reaches 90-92%, finishing by a calender, and finally rolling into paper by a winder.
2. The process for producing a high brightness kraft liner board according to claim 1, wherein the amount of the reducing bleaching agent added per ton of the face stock in step b is 3 kg.
3. The process for producing a high-brightness kraft liner board according to claim 1, wherein the amount of the top stock is 28g/m2。
4. The process for producing a high-brightness kraft liner board according to claim 1, wherein the surface sizing amount in the step f is 4 to 6g/m2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811214894.9A CN109457545B (en) | 2018-10-18 | 2018-10-18 | Production process of high-brightness kraft liner board |
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| CN201811214894.9A CN109457545B (en) | 2018-10-18 | 2018-10-18 | Production process of high-brightness kraft liner board |
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| CN109457545A CN109457545A (en) | 2019-03-12 |
| CN109457545B true CN109457545B (en) | 2021-06-01 |
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| CN110373945B (en) * | 2019-07-22 | 2021-10-15 | 汇胜集团平原纸业有限公司 | ML kraft paperboard and preparation process thereof |
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