CN112726268A - Pulping process of coated grey-bottom white board - Google Patents
Pulping process of coated grey-bottom white board Download PDFInfo
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- CN112726268A CN112726268A CN202011546261.5A CN202011546261A CN112726268A CN 112726268 A CN112726268 A CN 112726268A CN 202011546261 A CN202011546261 A CN 202011546261A CN 112726268 A CN112726268 A CN 112726268A
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- pulp
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- desander
- fiber
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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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/14—Secondary fibres
-
- 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
- B32B29/08—Corrugated paper or cardboard
-
- 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
- D21F11/12—Making corrugated paper or board
-
- 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
- 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
-
- 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
- D21H15/06—Long fibres, i.e. fibres exceeding the upper length limit of conventional paper-making fibres; Filaments
-
- 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
-
- 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
- D21H27/40—Multi-ply at least one of the sheets being non-planar, e.g. crêped
-
- 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
- B32B2250/04—4 layers
-
- 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
Abstract
The invention discloses a pulping process of coated grey white board paper, and a DIP (double in-line) pulp line comprises the following steps: s1, entering a first heat dispersion system through the first loop; s2, entering a lining pulp pool; s3, entering a second heat dispersion system through a second loop; s4, entering a bottom layer pulp tank; s5, entering a third heat dispersion system through a third loop; s6, entering a surface layer slurry pool; OCC grout line comprising: s1, feeding the raw material into a fiber grading sieve; s2, dividing the fiber into long fiber and short fiber; s3, enabling part of the slurry containing long fibers to enter a mixed slurry pool after a fine screening process and a first sand removing process; s4, enabling part of the fiber to enter a long fiber heat dispersion system; s5, entering a long fiber pulp tower; s6, when the step S3 is carried out, part of the slurry containing the short fibers enters a mixed slurry pool after the second sand removing process; s7, feeding partial good pulp into a short fiber pulp tower after the second sand removing procedure; and S8, feeding the good pulp in the mixed pulp tank and the good pulp in the short fiber pulp tower and the long fiber pulp tower into the core layer pulp tank together.
Description
Technical Field
The invention relates to the field of pulping and papermaking production, in particular to a pulping process of coated grey-bottom white board paper.
Background
The coated grey white board mainly comprises two layers of structures: one layer is a paper pulp layer and is further divided into a surface layer, a lining layer, a core layer and a bottom layer; the other layer is a coating layer which is divided into two layers or three layers according to the quality difference of products. Therefore, the coated grey white board has much higher energy consumption and environmental cost compared with other packaging paper production lines such as box board and corrugated medium, no matter in the pulping section or the paper-making section.
For example, in the invention CN109056407A, different waste papers are classified and processed by five different pulping lines, and then the white board coated with the grey bottom is prepared by a paper making section. However, two pulping lines (MOW, DIP) of the five pulping lines involve the bleaching process, which increases the manufacturing cost of the enterprise due to the equipment, energy consumption and labor cost.
Disclosure of Invention
The invention aims to provide a pulping process of coated grey white board paper, which can reduce the manufacturing cost of enterprises.
In order to solve the technical problem, the invention provides a pulping process of coated grey white board paper, which comprises a DIP pulp line and an OCC pulp line, wherein the DIP pulp line comprises the following steps:
s1, preparing the raw material by the first loop, and then feeding the raw material into a first heat dispersion system;
s2, enabling the pulp treated by the first thermal dispersion system to enter a lining pulp pool;
s3, making part of the slurry in the step S2 enter a second heat dispersion system after being prepared by a second loop;
s4, feeding the pulp treated by the second thermal dispersion system into a bottom layer pulp tank;
s5, the slurry obtained in the step S4 enters a third heat dispersion system after being prepared by a third loop;
s6, feeding the slurry treated by the third thermal dispersion system into a surface layer slurry tank;
the OCC slurry line comprises the following steps:
s1, sequentially passing the raw materials through a hydrapulper, a high-concentration slag remover and a coarse screen, and then feeding the raw materials into a fiber grading screen;
s2, sizing the slurry into long fibers and short fibers through fiber grading and screening;
s3, after the slurry containing long fibers is subjected to a fine screening process and a first sand removing process, partial tail slurry enters a mixed slurry pool;
s4, fine pulp formed by the fine screening process and the first sand removing process of the long fiber-containing slurry enters a long fiber thermal dispersion system;
s5, feeding the good pulp treated by the long fiber thermal dispersion system into a long fiber pulp tower;
s6, when the step S3 is carried out, part of the slurry containing short fibers enters a mixed slurry pond after the second sand removing process, forms mixed tail slurry with the tail slurry containing long fibers in the step S3, and enters a mixed slurry thermal dispersion system;
s7, enabling part of the fine pulp of the short fibers after the second sand removing procedure to enter a short fiber pulp tower;
and S8, after the good pulp in the mixed pulp tank is treated by the mixed pulp thermal dispersion system, the good pulp and the good pulp in the short fiber pulp tower and the long fiber pulp tower enter the core layer pulp tank together.
Further, the first loop comprises a rotary drum pulper, a high-concentration slag remover, a coarse screening machine, a medium-concentration sand remover, a fine screening machine, a deinking flotation tank and a multi-disc thickener which are arranged in sequence.
Further, the second loop comprises a deinking flotation tank and a multi-disc thickener which are arranged in sequence.
Furthermore, the third loop comprises a deinking flotation tank, a multi-disc thickener, a reduction bleaching tower and a low-concentration desander which are arranged in sequence.
Further, the fine screening process comprises a first-stage fine screen, a second-stage fine screen and a third-stage fine screen which are sequentially arranged; and the good pulp treated by the first-stage fine screen and the second-stage fine screen enters a first sand removing procedure, and the good pulp treated by the third-stage fine screen enters a mixed pulp tank.
Further, the first desanding procedure comprises a first-stage low-concentration desander, a second-stage desander and a third-stage desander which are arranged in sequence; part of the good pulp treated by the first-stage low-concentration desander and the second-stage desander enters a long-fiber thermal dispersion system, and the good pulp treated by the third-stage desander enters a mixed pulp tank.
Further, the second desanding procedure comprises a first-stage low-concentration desander, a second-stage desander, a third-stage desander and a fourth-stage desander which are arranged in sequence, the good pulp treated by the third-stage desander enters the second-stage desander, and part of the good pulp treated by the first-stage low-concentration desander and the second-stage desander enters the short fiber thermal dispersion system; and (4) the good pulp treated by the four-section desander enters a mixed pulp tank.
Further, in step S2 of the OCC slurry line, the ratio of long fibers to short fibers is 4: 6-5: 5.
further, in step S9 of the OCC slurry line, the short fibers in the core layer slurry pool: mixing tail slurry: long fiber 3: 3: 4.
further, after the slurry in the surface layer slurry pool, the lining layer slurry pool, the bottom layer slurry pool and the core layer slurry pool is conveyed by a flow system respectively, the composite pressing is carried out to complete the papermaking process.
The invention has the beneficial effects that:
the cultural paper DIP pulp line and the corrugated medium OCC pulp line are used for providing pulp for the white board machine with the coated gray bottom, so that the production and operation cost can be saved; in the preparation of the surface layer, the lining layer and the core layer of the coated grey white board paper, the application realizes the functions of three pulping lines in the prior art by only using one DIP deinking pulp line, thereby not only realizing the water resource saving in the pulping process, but also reducing the discharge of pulping waste water and realizing the treatment of minimizing the environmental pollution; the core layer pulp utilizes short fiber pulping of OCC pulping line of corrugated medium production line, long fiber pulping and tail pulp of long fiber desander and fine screen, thus improving the utilization efficiency of raw materials.
Drawings
FIG. 1 is a top, bottom and lining pulping process of the present invention;
FIG. 2 is a process flow of the OCC pulping line of the present invention for preparing coated grey board paper core layer pulp;
FIG. 3 is a sheet making process for coating gray-based white board.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Referring to fig. 1 to 3, an embodiment of a pulping process of a coated grey white board according to the present invention includes a DIP line and an OCC line, wherein the DIP line includes the following steps:
s1, preparing the raw material by the first loop, and then feeding the raw material into a first heat dispersion system;
s2, enabling the pulp treated by the first thermal dispersion system to enter a lining pulp pool;
s3, making part of the slurry in the step S2 enter a second heat dispersion system after being prepared by a second loop;
s4, feeding the pulp treated by the second thermal dispersion system into a bottom layer pulp tank;
s5, the slurry obtained in the step S4 enters a third heat dispersion system after being prepared by a third loop;
s6, feeding the slurry treated by the third thermal dispersion system into a surface layer slurry tank;
the OCC slurry line comprises the following steps:
s1, sequentially passing the raw materials through a hydrapulper, a high-concentration slag remover and a coarse screen, and then feeding the raw materials into a fiber grading screen;
s2, sizing the slurry into long fibers and short fibers through fiber grading and screening;
s3, after the slurry containing long fibers is subjected to a fine screening process and a first sand removing process, partial tail slurry enters a mixed slurry pool;
s4, fine pulp formed by the fine screening process and the first sand removing process of the long fiber-containing slurry enters a long fiber thermal dispersion system;
s5, feeding the good pulp treated by the long fiber thermal dispersion system into a long fiber pulp tower;
s6, when the step S3 is carried out, part of the slurry containing short fibers enters a mixed slurry pond after the second sand removing process, forms mixed tail slurry with the tail slurry containing long fibers in the step S3, and enters a mixed slurry thermal dispersion system;
s7, enabling part of the fine pulp of the short fibers after the second sand removing procedure to enter a short fiber pulp tower;
and S8, after the good pulp in the mixed pulp tank is treated by the mixed pulp thermal dispersion system, the good pulp and the good pulp in the short fiber pulp tower and the long fiber pulp tower enter the core layer pulp tank together.
In the manufacturing process, slurry in the surface layer slurry pool, the lining layer slurry pool, the bottom layer slurry pool and the core layer slurry pool is conveyed by a flow system respectively and then is subjected to composite squeezing.
The pulping process for coating the grey-bottom white board in the embodiment reduces mixed pulp of a primary circuit of the MOW pulp line and a DIP pulp line subjected to oxidation bleaching and reduction bleaching in the prior art, and reduces two bleaching processes, so that the pollution to the environment can be reduced.
In addition, compared with the bottom layer pulp provided by the ONP pulp line in the invention CN109056407A, the bottom layer pulp making process reduces pulp making equipment, reduces energy consumption and labor cost, and actually, the yield and the use amount of the national newsprint are reduced year by year from 2010, most of old newsprint are mixed with mixed office waste paper and are recycled by a paper mill, so that the process is more suitable for the utilization of the DIP.
The first loop comprises a rotary drum pulper, a high-concentration slag separator, a coarse screening machine, a medium-concentration sand separator, a fine screening machine, a deinking flotation tank and a multi-disc thickener which are arranged in sequence. The second loop comprises a deinking flotation tank and a multi-disc thickener which are arranged in sequence. The third loop comprises a deinking flotation tank, a multi-disc thickener, a reduction bleaching tower and a low-concentration desander which are arranged in sequence. In this embodiment, the bottom layer slurry is provided by the slurry processed by the second thermal dispersion system in the second loop, and the bottom layer slurry can be well removed by the two flotation processes and the two thermal dispersion processes, and the influence of the sticky substances in the slurry on the paper surface is reduced.
The fine screening process comprises a first-stage fine screen, a second-stage fine screen and a third-stage fine screen which are arranged in sequence; and the good pulp treated by the first-stage fine screen and the second-stage fine screen enters a first sand removing process, the good pulp treated by the third-stage fine screen enters a mixed pulp tank, and tailings are sent to a slag pulp treatment workshop for treatment.
The first desanding procedure comprises a first-section low-concentration desander, a second-section desander and a third-section desander which are arranged in sequence; part of the good pulp treated by the first-stage low-concentration desander and the second-stage desander enters a long-fiber thermal dispersion system, the good pulp treated by the third-stage desander enters a mixed pulp tank, and tailings are sent to a slag pulp treatment workshop for treatment.
The second desanding procedure comprises a first-section low-concentration desander, a second-section desander, a third-section desander and a fourth-section desander which are arranged in sequence, the good pulp treated by the third-section desander enters the second-section desander, and part of the good pulp treated by the first-section low-concentration desander and the second-section desander enters the short fiber pulp tower; the good pulp treated by the four-section desander enters a mixed pulp tank, and the tailings are sent to a slag pulp treatment workshop for treatment.
In step S2 of the OCC pulp strand, the ratio of long fibers to short fibers is 4: 6-5: 5. in step S9 of the OCC slurry line, the short fibers in the core layer slurry pool: mixing tail slurry: long fiber 3: 3: 4. the good pulp discharged by the four-section desander during short fiber treatment, the good pulp discharged by the three-section fine screen during long fiber treatment and the good pulp discharged by the three-section desander during long fiber treatment can be regarded as slag pulp of the previous working section to some extent, the pulp contains more stickies, and the circulation of the stickies in the system can be reduced and the cleanliness of the system can be improved by discharging and intensively treating the pulp.
In the application, a multi-disc thickener and a thermal dispersion system are used for carrying out high-temperature high-concentration treatment on the slurry in a concentrated manner in the slurry treatment of the surface layer, the lining layer, the bottom layer and the core layer, so that sticky matters are kneaded and hot-melted into fine particles which are invisible to naked eyes; and the fiber can be curled after high-temperature treatment, so that the paper density can be reduced, the bulk and the tearing strength of the paper can be improved, and the method is very favorable for the coated grey-bottom white board with high gram weight.
In the embodiment, the cultural paper DIP pulp line and the corrugated medium OCC pulp line are used for providing pulp for the white board coating machine with the coated gray bottom, and compared with the invention CN109056407A, the white board coating machine is more economical and applicable, and the production and operation cost can be saved. In the preparation of the surface layer, the lining layer and the core layer of the coated grey white board, CN109056407A realizes the functions of three pulping lines through three pulping lines (wherein MOW and DIP need bleaching treatment, and MOW, DIP and ONP need deinking treatment), but the invention only uses one DIP deinking pulp line, thereby not only realizing the water resource saving in the pulping process, but also reducing the discharge of pulping waste water and realizing the treatment of minimizing the environmental pollution. The core layer pulp utilizes short fiber pulping of OCC pulping line of corrugated medium production line, long fiber pulping and tail pulp of long fiber desander and fine screen, thus improving the utilization efficiency of raw materials.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. The pulping process of the coated grey white board is characterized by comprising a DIP pulp line and an OCC pulp line, wherein the DIP pulp line comprises the following steps:
s1, preparing the raw material by the first loop, and then feeding the raw material into a first heat dispersion system;
s2, enabling the pulp treated by the first thermal dispersion system to enter a lining pulp pool;
s3, making part of the slurry in the step S2 enter a second heat dispersion system after being prepared by a second loop;
s4, feeding the pulp treated by the second thermal dispersion system into a bottom layer pulp tank;
s5, the slurry obtained in the step S4 enters a third heat dispersion system after being prepared by a third loop;
s6, feeding the slurry treated by the third thermal dispersion system into a surface layer slurry tank;
the OCC slurry line comprises the following steps:
s1, sequentially passing the raw materials through a hydrapulper, a high-concentration slag remover and a coarse screen, and then feeding the raw materials into a fiber grading screen;
s2, sizing the slurry into long fibers and short fibers through fiber grading and screening;
s3, after the slurry containing long fibers is subjected to a fine screening process and a first sand removing process, partial tail slurry enters a mixed slurry pool;
s4, fine pulp formed by the fine screening process and the first sand removing process of the long fiber-containing slurry enters a long fiber thermal dispersion system;
s5, feeding the good pulp treated by the long fiber thermal dispersion system into a long fiber pulp tower;
s6, when the step S3 is carried out, part of the slurry containing short fibers enters a mixed slurry pond after the second sand removing process, forms mixed tail slurry with the tail slurry containing long fibers in the step S3, and enters a mixed slurry thermal dispersion system;
s7, enabling part of the fine pulp of the short fibers after the second sand removing procedure to enter a short fiber pulp tower;
and S8, after the good pulp in the mixed pulp tank is treated by the mixed pulp thermal dispersion system, the good pulp and the good pulp in the short fiber pulp tower and the long fiber pulp tower enter the core layer pulp tank together.
2. The process for pulping coated grey board according to claim 1, wherein the first circuit comprises a drum pulper, a high consistency reject cleaner, a coarse screen, a medium consistency sand remover, a fine screen, a deinking flotation cell and a multi-disc thickener arranged in series.
3. The process for pulping coated grey board according to claim 1, wherein the second circuit comprises a deinking flotation cell and a multi-disc thickener arranged in series.
4. The process of making coated grey white board according to claim 1, wherein the third loop comprises a deinking flotation cell, a multi-tray thickener, a reductive bleaching tower, and a low-consistency desander in that order.
5. The coated grey white board pulping process according to claim 1, wherein the fine screening process comprises a first-stage fine screen, a second-stage fine screen and a third-stage fine screen which are arranged in sequence; and the good pulp treated by the first-stage fine screen and the second-stage fine screen enters a first sand removing procedure, and the good pulp treated by the third-stage fine screen enters a mixed pulp tank.
6. The coated gray-bottom white board pulping process according to claim 1, wherein the first desanding step comprises a first low-concentration desander, a second desander and a third desander arranged in sequence; part of the good pulp treated by the first-stage low-concentration desander and the second-stage desander enters a long-fiber thermal dispersion system, and the good pulp treated by the third-stage desander enters a mixed pulp tank.
7. The coated gray-bottom white board pulping process according to claim 1, wherein the second desanding step comprises a first low-concentration desander, a second desander, a third desander and a fourth desander arranged in sequence, the good pulp treated by the third desander enters the second desander, and part of the good pulp treated by the first low-concentration desander and the second desander enters the short fiber pulp tower; and (4) the good pulp treated by the four-section desander enters a mixed pulp tank.
8. The coated grey white board pulping process of claim 1, wherein in step S2 of the OCC pulp line, the ratio of long fibers to short fibers is 4: 6-5: 5.
9. the process for pulping coated grey board according to claim 1, wherein in step S9 of the OCC pulp line, the short fiber: mixing tail slurry: long fiber 3: 3: 4.
10. the process for making coated grey white board as claimed in claim 1, wherein the pulp in the surface pulp pond, the lining pulp pond, the bottom pulp pond and the core pulp pond are conveyed separately through the conveying system and then pressed compositely to complete the papermaking process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011546261.5A CN112726268A (en) | 2020-12-23 | 2020-12-23 | Pulping process of coated grey-bottom white board |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011546261.5A CN112726268A (en) | 2020-12-23 | 2020-12-23 | Pulping process of coated grey-bottom white board |
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| Publication Number | Publication Date |
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| CN112726268A true CN112726268A (en) | 2021-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011546261.5A Pending CN112726268A (en) | 2020-12-23 | 2020-12-23 | Pulping process of coated grey-bottom white board |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114525698A (en) * | 2021-12-28 | 2022-05-24 | 玖龙纸业（东莞）有限公司 | Device and method for improving bonding force of grey first-coat white board paper core layer |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107401078A (en) * | 2017-09-01 | 2017-11-28 | 玖龙纸业（太仓）有限公司 | A kind of process units and production method of coated duplex board with grey back and Cultural Paper |
| CN109056407A (en) * | 2018-08-13 | 2018-12-21 | 联盛纸业（龙海）有限公司 | A kind of production technology of the advanced coating coated duplex board with grey back of ONP slurry substitution DIP slurry production |
| CN109082945A (en) * | 2018-07-04 | 2018-12-25 | 东莞建晖纸业有限公司 | A kind of preparation process being coated with coated duplex board with grey back |
-
2020
- 2020-12-23 CN CN202011546261.5A patent/CN112726268A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107401078A (en) * | 2017-09-01 | 2017-11-28 | 玖龙纸业（太仓）有限公司 | A kind of process units and production method of coated duplex board with grey back and Cultural Paper |
| CN109082945A (en) * | 2018-07-04 | 2018-12-25 | 东莞建晖纸业有限公司 | A kind of preparation process being coated with coated duplex board with grey back |
| CN109056407A (en) * | 2018-08-13 | 2018-12-21 | 联盛纸业（龙海）有限公司 | A kind of production technology of the advanced coating coated duplex board with grey back of ONP slurry substitution DIP slurry production |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114525698A (en) * | 2021-12-28 | 2022-05-24 | 玖龙纸业（东莞）有限公司 | Device and method for improving bonding force of grey first-coat white board paper core layer |
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