CN111648157A - Production process of medium-density insulating paperboard - Google Patents
Production process of medium-density insulating paperboard Download PDFInfo
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- CN111648157A CN111648157A CN202010448445.1A CN202010448445A CN111648157A CN 111648157 A CN111648157 A CN 111648157A CN 202010448445 A CN202010448445 A CN 202010448445A CN 111648157 A CN111648157 A CN 111648157A
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- paperboard
- pulp
- wet paper
- density insulating
- slurry
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- 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
- D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
- D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/34—Kneading or mixing; Pulpers
- D21B1/345—Pulpers
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
- D21D1/30—Disc mills
- D21D1/303—Double disc mills
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
- D21D5/06—Rotary screen-drums
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/48—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials
- H01B3/52—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials wood; paper; press board
Abstract
The invention provides a production process of a medium-density insulating paperboard, and relates to the technical field of insulating paperboard production. The production process of the medium-density insulating paperboard comprises the following specific steps: s1, pulping; s2, grinding; s3, sizing and purifying; s4, compounding wet paper pages; s5, forming a wet paper board; s6, pressing the paperboard; and S7, cardboard health preserving, storing and detecting. The invention can produce the product with the thickness of 0.8mm-6.0mm and the density of 0.95-1.25g/cm in large scale through a reasonable preparation process3The medium density insulating paperboard can prevent overheating from causing carbonization of the paperboard in the production process, the electric insulating property of the paperboard is effectively guaranteed, the production process is reasonable, the production efficiency of the medium density insulating paperboard is high, and the medium density insulating paperboard is green and environment-friendly and is beneficial to sustainable development of enterprises.
Description
Technical Field
The invention relates to the technical field of insulating paperboard production, in particular to a production process of a medium-density insulating paperboard.
Background
The insulation paper board is generally applied to electric industry equipment, and with the rapid development of our economy, the demand for the insulation paper board is rapidly increased, and the insulation paper board is generally an air insulation paper board, an oil insulation paper board and the like, because of good insulation, heat resistance and durability.
The medium-density insulating paperboard is mainly used for manufacturing insulating paperboard pieces of oil-immersed transformers, the thickness of the medium-density insulating paperboard is 0.8-6.0 mm, and the density range is 0.95-1.25g/cm3The paper board has a blank problem in the current industry.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects in the prior art, the invention provides a production process of a medium-density insulating paperboard, which solves the defects and shortcomings in the prior art.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a production process of medium-density insulating paperboard comprises the following specific steps:
s1, pulping;
s2, grinding;
s3, sizing and purifying;
s4, compounding wet paper pages;
s5, forming a wet paper board;
s6, pressing the paperboard;
and S7, cardboard health preserving, storing and detecting.
Preferably, the pulp crushing treatment in the step 1 specifically comprises: the raw materials are put into a hydrapulper according to the proportion of technological requirements, the conductivity of a water extract of the raw materials is 2.0-3.22, the percentage content of ash is 0.20-0.42, papermaking white water or clear water is added according to the technological requirement of pulping concentration, after the raw materials are defibered by 15-18min through hydrapulper, a pulping pump of the pulper is conveyed to a pulp tank before grinding through a pipeline, after the pulp tank before grinding is full of pulp, the pulp is conveyed to a concentration adjusting device through a pipeline of the pulping pump, after the concentration is adjusted to reach 4-5% of the technological requirement of pulping, heavy slag is removed through a high-concentration slag remover, metal powder carried in the pulp is removed through a magnetic adsorption device, and the pulp enters a pulping process.
Preferably, the refining treatment in the step 2 is specifically: the concentrated and purified pulp is pumped to two disc mills connected in series, the pulp grinding concentration is 4-5%, the two grinding discs are ensured to be parallel in the use process of the pulp grinder, the distance difference is not more than 5mm, the pulp grinding pressure is not lower than the process requirement range, the pulp is ground by the double disc mills, the pulp is cut off and kneaded to be devillicate and broomed, the combination between fibers is more facilitated after the fibers are fluffed, and the pulp is conveyed to a ground pulp tank for standby after the process requirements are met by detecting the beating degree and the wet weight.
Preferably, the sizing and purifying in the step 3 specifically comprise: slurry stored in the ground slurry tank is conveyed to a bin gate slurry tank through a corresponding slurry lifting pump, then conveyed to a concentration adjusting device through a bin gate slurry lifting pump to be diluted and adjusted to the concentration of 2.5%, conveyed to a bin gate box, conveyed to a fan pump through a constant liquid level of the bin gate box and purified through a three-level low-concentration desander, the slurry inlet pressure and the slurry outlet pressure are set, the slurry inlet pressure is 0.2Mpa, the slurry outlet pressure is 0.28Mpa, light slag and thick fiber bundles are removed, and then the slurry is screened through a pressure screen, and low-concentration desander tailings and pressure screen heavy slag are discharged from a trench.
Preferably, the wet paper sheet compounding in the step 4 is specifically as follows: the pulp from the pressure screen is uniformly sprayed on a forming net through a No. 1 head box, and is uniformly dewatered through a table board, a first dewatering board, a second dewatering board and a third dewatering board to form a single-layer wet paper sheet, and the pulp hanging amount of the single-layer wet paper sheet is 30-50g/m2And (3) dehydrating by using a vacuum box, compounding the dehydrated wet paper with the wet paper from the No. 2 headbox at a compounding roller to form a double-layer wet paper, and preparing the compounded wet paper to enter a forming cylinder for multi-layer compounding, wherein the moisture content of the compounded wet paper is 20-22%.
Preferably, the wet paperboard forming in the step 5 specifically comprises: the wet paper sheet dewatered by the paper machine is wound in multiple layers in a forming cylinder, and is pressurized and dewatered by a carrier roller, two carrier rollers and three carrier rollers below the forming cylinder, the forming cylinder is provided with a wet paper sheet thickness detector, the wet paper sheet is wound and accumulated to a certain thickness, then is cut by a blade of the forming cylinder, enters a wet paper sheet conveying platform, is cut to a specified size by a transverse cutter, and then enters a pre-loading machine.
Preferably, the pressing of the paperboard in the step 6 is specifically as follows: the plate loading machine conveys wet paper plates to a press to correspond to the number of layers, the total pressure of the press is 11000 tons, the number of layers is 20, a circulating heating pipeline is designed in the press plate, superheated water is adopted for heating, wear-resistant hydraulic oil is used in a hydraulic station, the same closed system is adopted, the pressing time and the pressure of each layer of the paper plates are ensured to be equal, different information such as the drying temperature, the pressure maintaining time and the number of pressing sections of the press are set according to the thickness of the pressed paper plates, and the temperature of the press plate can not exceed.
Preferably, the cardboard health preserving, storing and detecting in the step 7 specifically comprises: after the paperboard is subjected to hot pressing, the paperboard is dragged out to a conveying belt through a plate unloading machine, each paperboard is detected whether cavities, metal foreign bodies and the like exist through an X-ray machine, the detection precision is 0.2mm, the paperboard needs to be subjected to health maintenance treatment, the health maintenance time is 2 days, all indexes are detected according to the medium-density insulating paperboard standard, and the paperboard is cut, packaged and warehoused after being qualified.
Preferably, the production process further comprises the treatment of the paperboard with water: the raw water passes through a multi-medium filter, an activated carbon filter and a security filter to further purify the raw water, and then passes through RO reverse osmosis treatment to remove impurities, metal ions and the like in the water by utilizing reverse osmosis membrane differential pressure; wherein, the RO reverse osmosis system adopts a mode of combining first-stage second-stage water production and second-stage water production to produce water.
(III) advantageous effects
The invention provides a production process of a medium-density insulating paperboard. The method has the following beneficial effects:
the invention can produce the product with the thickness of 0.8mm-6.0mm and the density of 0.95-1.25g/cm in large scale through a reasonable preparation process3The medium density insulating paperboard can prevent overheating from causing carbonization of the paperboard in the production process, the electric insulating property of the paperboard is effectively guaranteed, the production process is reasonable, the production efficiency of the medium density insulating paperboard is high, and the medium density insulating paperboard is green and environment-friendly and is beneficial to sustainable development of enterprises.
Drawings
FIG. 1 is a schematic view of the process of the present invention;
FIG. 2 is a schematic diagram of a water treatment process of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
as shown in fig. 1-2, an embodiment of the present invention provides a production process of a medium density insulating paperboard, which includes the following specific steps:
s1, pulping: putting the raw materials into a hydrapulper according to the proportion of technological requirements, wherein the conductivity of a water extract of the raw materials is 2.0-3.22, the percentage content of ash is 0.20-0.42, adding papermaking white water or clear water according to the technological requirement of pulping concentration of 5-6%, defibering the raw material wood pulp by 15-18min through hydrapulper, conveying a pulp lifting pump of the pulper to a pulp tank before grinding through a pipeline, conveying the pulp to a concentration adjusting device through a pulp lifting pump pipeline after the pulp tank before grinding is full of pulp, adjusting the concentration to 4-5% of the technological requirement of pulping, removing heavy slag through a high-concentration slag remover, removing metal powder carried in the pulp through a magnetic adsorption device, and feeding the pulp into a pulping process;
in the invention, the medium-density insulating paperboard adopts 100 percent of imported sulfate softwood pulp;
s2, grinding: the concentrated and purified pulp is pumped to two disc mills connected in series, the concentration of the pulp grinding is 4-5%, the two grinding discs are ensured to be parallel in the use process of the pulp grinder, the distance difference is not more than 5mm, the pulp grinding pressure is not lower than the process requirement range, the pulp is ground by the double disc mills, the pulp is cut off and kneaded to be devillicate and broomed, the combination between fibers is more facilitated after the fibers are fluffed, and the pulp is conveyed to a ground pulp tank for standby after the process requirements are met by detecting the beating degree and the wet weight;
s3, sizing and purifying: the method comprises the following steps of conveying slurry stored in a ground slurry tank to a bin gate slurry tank through a corresponding slurry lifting pump, conveying the slurry to a concentration adjusting device through a bin gate slurry lifting pump to be diluted and adjusted to the concentration of 2.5%, conveying the slurry to a bin gate box, conveying the slurry to a fan pump through a constant liquid level of the bin gate box, purifying the slurry through a three-level low-concentration sand remover, setting the slurry inlet and outlet pressure, removing light slag and thick fiber bundles, screening the slurry through a pressure screen, and discharging tailings of the low-concentration sand remover and heavy slag of the pressure screen to a trench;
adopt super former cloth thick liquid, compare traditional cylinder mould cloth thick liquid, the net part that long cylinder combines can be effectual along the horizontal even thick liquids dispersion fibre of distribution of paper machine, produces the high strength microturbulence, can effectual dispersion fibre, prevents that the fibre from deposiing and flocculation again, the intensity and the homogeneity of effectual improvement paper leaf.
S4, compounding wet paper: the pulp from the pressure screen is uniformly sprayed on a forming net through a No. 1 head box, and is uniformly dewatered by a chopping board, a first dewatering board, a second dewatering board and a third dewatering board to form a single-layer wet paper sheet (wherein the chopping board, the first dewatering board, the second dewatering board and the third dewatering board are all the prior mature technologies and are not elaborated in detail), and the pulp hanging amount of the single-layer wet paper sheet is 30-50g/m2Dehydrating by a vacuum box, compounding the dehydrated wet paper with the wet paper from the No. 2 headbox at a compounding roller to form double-layer wet paper, and preparing the compounded wet paper to enter a forming cylinder for multi-layer compounding, wherein the moisture content of the compounded wet paper is 20-22%;
s5, wet paper board forming: the wet paper sheet dewatered by a paper machine is wound in multiple layers in a forming cylinder, and is subjected to pressure dewatering by a carrier roller, two carrier rollers and three carrier rollers below the forming cylinder (wherein one carrier roller, two carrier rollers and three carrier rollers are the prior mature technologies and are not elaborated in detail), a wet paper sheet thickness detector is installed in the forming cylinder, the wet paper sheet is cut off by a blade of the forming cylinder after being wound and accumulated to a certain thickness and enters a wet paper sheet conveying platform, and the wet paper sheet is cut to a specified size by a transverse cutter and then enters a pre-loading machine;
s6, paperboard pressing: the plate loading machine conveys the wet paper plates to a press for corresponding layers, the total pressure of the press is 11000 tons, 20 layers, a circulating heating pipeline is designed in the press plate, superheated water is adopted for heating, a hydraulic station uses wear-resistant hydraulic oil, and the same closed system ensures that the pressing time and the pressure of each layer of paper plates are equal, different information such as the drying temperature, the pressure maintaining time and the number of pressing sections of the press are set according to the thickness of the pressed paper plates, the maximum temperature of the press plate cannot exceed 145 ℃, and the carbonization of the paper plates caused by overheating is prevented;
s7, cardboard health preserving, storing and detecting: after the paperboard is subjected to hot pressing, the paperboard is dragged out to the conveying belt through the plate unloading machine, whether cavities, metal foreign bodies and the like exist in each paperboard is detected through the X-ray machine, the detection precision is 0.2mm, the electrical insulation performance of the paperboard is effectively guaranteed, the paperboard needs to be subjected to health maintenance treatment for thoroughly releasing the stress of the paperboard and balancing the moisture of the paperboard, the health maintenance time is 2 days, all indexes are detected according to the medium-density insulation paperboard standard, and the paperboard is cut, packaged and warehoused after being qualified.
In the invention, the production process also comprises the following steps of treating the paperboard with water: raw water passes through a multi-medium filter, an activated carbon filter and a security filter to be further purified, and then passes through RO reverse osmosis treatment, impurities, metal ions and the like in the water are removed by utilizing reverse osmosis membrane differential pressure, and the conductivity of produced water is reduced; wherein, the RO reverse osmosis system adopts a mode of combining first-stage second-stage water production and second-stage water production to produce water.
The invention can produce the product with the thickness of 0.8mm-6.0mm and the density of 0.95-1.25g/cm in large scale through a reasonable preparation process3The medium density insulating paperboard can prevent overheating from causing carbonization of the paperboard in the production process, the electric insulating property of the paperboard is effectively guaranteed, the production process is reasonable, the production efficiency of the medium density insulating paperboard is high, and the medium density insulating paperboard is green and environment-friendly and is beneficial to sustainable development of enterprises.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A production process of medium-density insulating paperboard is characterized by comprising the following steps: the production process comprises the following specific steps:
s1, pulping;
s2, grinding;
s3, sizing and purifying;
s4, compounding wet paper pages;
s5, forming a wet paper board;
s6, pressing the paperboard;
and S7, cardboard health preserving, storing and detecting.
2. The process for producing a medium density insulating paperboard according to claim 1, wherein: the slurry crushing treatment in the step 1 specifically comprises the following steps: the raw materials are put into a hydrapulper according to the proportion of technological requirements, the conductivity of the water extract of the raw materials is 2.0-3.22, the percentage content of ash content is 0.20-0.42, papermaking white water or clear water is added according to the technological requirement of pulping concentration, after the raw materials are defibered for 15-18min through hydrapulper action, a pulping pump of the pulper is conveyed to a pulp tank before grinding through a pipeline, after the pulp tank before grinding is full of pulp, the pulp is conveyed to a concentration adjusting device through a pulp pump pipeline, after the concentration is adjusted to reach 4-5% of the technological requirement of pulping, heavy slag is removed through a high-concentration slag remover, metal powder carried in the pulp is removed through a magnetic adsorption device, and the pulp enters the pulping process.
3. The process for producing a medium density insulating paperboard according to claim 1, wherein: the step 2 of grinding the pulp comprises the following specific steps: the concentrated and purified pulp is pumped to two disc mills connected in series, the pulp grinding concentration is 4-5%, the two grinding discs are ensured to be parallel in the use process of the pulp grinder, the distance difference is not more than 5mm, the pulp grinding pressure is not lower than the process requirement range, the pulp is ground by the double disc mills, the pulp is cut off and kneaded to be devillicate and broomed, the combination between fibers is more facilitated after the fibers are fluffed, and the pulp is conveyed to a ground pulp tank for standby after the process requirements are met by detecting the beating degree and the wet weight.
4. The process for producing a medium density insulating paperboard according to claim 1, wherein: the sizing and purifying in the step 3 specifically comprises the following steps: slurry stored in the ground slurry tank is conveyed to a bin gate slurry tank through a corresponding slurry lifting pump, then conveyed to a concentration adjusting device through a bin gate slurry lifting pump to be diluted and adjusted to the concentration of 2.5%, conveyed to a bin gate box, conveyed to a fan pump through a constant liquid level of the bin gate box and purified through a three-level low-concentration desander, the slurry inlet pressure and the slurry outlet pressure are set, the slurry inlet pressure is 0.2Mpa, the slurry outlet pressure is 0.28Mpa, light slag and thick fiber bundles are removed, and then the slurry is screened through a pressure screen, and low-concentration desander tailings and pressure screen heavy slag are discharged from a trench.
5. The process for producing a medium density insulating paperboard according to claim 1, wherein: the compounding of the wet paper sheet in the step 4 is specifically as follows: the pulp from the pressure screen is uniformly sprayed on a forming net through a No. 1 head box, and is uniformly dewatered through a table board, a first dewatering board, a second dewatering board and a third dewatering board to form a single-layer wet paper sheet, and the pulp hanging amount of the single-layer wet paper sheet is 30-50g/m2And (3) dehydrating by using a vacuum box, compounding the dehydrated wet paper with the wet paper from the No. 2 headbox at a compounding roller to form a double-layer wet paper, and preparing the compounded wet paper to enter a forming cylinder for multi-layer compounding, wherein the moisture content of the compounded wet paper is 20-22%.
6. The process for producing a medium density insulating paperboard according to claim 1, wherein: the wet paperboard forming in the step 5 specifically comprises the following steps: the wet paper sheet dewatered by the paper machine is wound in multiple layers in a forming cylinder, and is pressurized and dewatered by a carrier roller, two carrier rollers and three carrier rollers below the forming cylinder, the forming cylinder is provided with a wet paper sheet thickness detector, the wet paper sheet is wound and accumulated to a certain thickness, then is cut by a blade of the forming cylinder, enters a wet paper sheet conveying platform, is cut to a specified size by a transverse cutter, and then enters a pre-loading machine.
7. The process for producing a medium density insulating paperboard according to claim 1, wherein: the paperboard pressing in the step 6 specifically comprises the following steps: the plate loading machine conveys wet paper plates to a press to correspond to the number of layers, the total pressure of the press is 11000 tons, the number of layers is 20, a circulating heating pipeline is designed in the press plate, superheated water is adopted for heating, wear-resistant hydraulic oil is used in a hydraulic station, the same closed system is adopted, the pressing time and the pressure of each layer of the paper plates are ensured to be equal, different information such as the drying temperature, the pressure maintaining time and the number of pressing sections of the press are set according to the thickness of the pressed paper plates, and the temperature of the press plate can not exceed.
8. The process for producing a medium density insulating paperboard according to claim 1, wherein: the cardboard health preserving, storing and detecting in the step 7 specifically comprises the following steps: after the paperboard is subjected to hot pressing, the paperboard is dragged out to a conveying belt through a plate unloading machine, each paperboard is detected whether cavities, metal foreign bodies and the like exist through an X-ray machine, the detection precision is 0.2mm, the paperboard needs to be subjected to health maintenance treatment, the health maintenance time is 2 days, all indexes are detected according to the medium-density insulating paperboard standard, and the paperboard is cut, packaged and warehoused after being qualified.
9. The process for producing a medium density insulating paperboard according to claim 1, wherein: the production process also comprises the following steps of treating the paperboard with water: the raw water passes through a multi-medium filter, an activated carbon filter and a security filter to further purify the raw water, and then passes through RO reverse osmosis treatment to remove impurities, metal ions and the like in the water by utilizing reverse osmosis membrane differential pressure; wherein, the RO reverse osmosis system adopts a mode of combining first-stage second-stage water production and second-stage water production to produce water.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112900131A (en) * | 2021-01-17 | 2021-06-04 | 江苏宇航板业有限公司 | Production process of high-performance paper pulp |
| CN113529475A (en) * | 2021-07-27 | 2021-10-22 | 潍坊汇胜绝缘技术有限公司 | Production method of high-temperature-resistant insulating paperboard |
| CN114566368A (en) * | 2022-02-17 | 2022-05-31 | 常州市英中电气有限公司 | Manufacturing process of insulation layer paper pressing plate capable of preventing cracking |
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| CN112900131A (en) * | 2021-01-17 | 2021-06-04 | 江苏宇航板业有限公司 | Production process of high-performance paper pulp |
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| CN114566368A (en) * | 2022-02-17 | 2022-05-31 | 常州市英中电气有限公司 | Manufacturing process of insulation layer paper pressing plate capable of preventing cracking |
| CN114566368B (en) * | 2022-02-17 | 2023-06-30 | 常州市英中电气有限公司 | Manufacturing process of insulating laminated paperboard capable of preventing cracking |
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