CN113183536B - Preparation method of insulating paperboard - Google Patents
Preparation method of insulating paperboard Download PDFInfo
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- CN113183536B CN113183536B CN202110566378.8A CN202110566378A CN113183536B CN 113183536 B CN113183536 B CN 113183536B CN 202110566378 A CN202110566378 A CN 202110566378A CN 113183536 B CN113183536 B CN 113183536B
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- paperboard
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
- B31F1/0003—Shaping by bending, folding, twisting, straightening, flattening or rim-rolling; Shaping by bending, folding or rim-rolling combined with joining; Apparatus therefor
- B31F1/0035—Straightening or flattening
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Abstract
The invention discloses a preparation method of an insulating paperboard. The invention can effectively remove the defects caused by the adhesive in the preparation of the insulating paperboard with the thickness of 10 mm-50 mm, and improve the overall quality and the production efficiency of the insulating paperboard.
Description
Technical Field
The invention belongs to the technical field of insulating product production, and particularly relates to a preparation method of an insulating paperboard.
Background
Laminated paper boards are widely applied to insulating parts of transformers, and generally, parts of the insulating paper boards with the thickness exceeding 10mm need to be processed by the laminated paper boards. The existing processing method is formed by bonding single plates (paper plates with the thickness of less than 10 mm) with adhesives, the number of the single plates is determined according to the thickness of the insulating paper plates, the single plates need to be dried before bonding, redundant moisture is removed, the single plates need to be cooled after drying is finished so as to meet the requirement of the adhesives on temperature, then glue is applied or gummed paper is placed between adjacent single plates, finally pressure is applied, the insulating paper plates are bonded to the required thickness, the process of the whole process is complex, and the processing period is long. In addition, the production process contains an adhesive, so that holes and water channels are easy to exist in the insulating paperboard, the thickness is uneven, the density is uneven, and the uniformity and consistency of the insulating performance can not be guaranteed. Meanwhile, because the polarity of the adhesive is far greater than that of pure insulating paper pulp, the polarization effect and the interface effect in a high-voltage electric field are main causes of loss of the electrical strength of a non-homogeneous insulating material, and particularly in transformers with direct current +/-600 and alternating current of more than 1000kv, the adverse effect of the adhesive is very serious.
Therefore, if the above defects are to be overcome and the production efficiency and the product quality are to be improved, the existing process must be modified.
The invention content is as follows:
the technical problem to be solved by the invention is as follows: the preparation method of the insulating paperboard can effectively remove the defects caused by adhesives in the preparation of the insulating paperboard with the thickness of 10-50 mm, and improve the overall quality and the production efficiency of the insulating paperboard.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a preparation method of insulating paperboard comprises the following steps:
a. preparing a single plate: selecting the thickness and the number of the single boards according to the thickness of the insulating paper boards;
b. humidifying and stacking: adding water to the surfaces of the veneers, then rolling, and aligning and stacking the edges of the veneers after rolling;
c. standing: standing the stacked wet paperboards for 4-8 hours; the moisture distribution in the wet paper board is more uniform;
d. and (3) upper die: placing the standing wet paper board on a mold;
e. cold pressing: pressing the wet paper board at normal temperature, and setting the initial pressure to be N according to the thickness of the insulating paper board0First pressing using a pressure of N0+0.2MPa, the pressure will gradually decrease to N with the continuous loss of water in the wet paper board0Then using a pressure of N0And +0.4Mpa, wherein the pressure increase range is 0.2Mpa each time when the pressing is carried out until the pressing pressure reaches the set termination pressure N1；
f. Hot pressing: heating the mold to 120-130 ℃, and adopting the pressure N1Pressing under +/-0.5 Mpa for a time set according to the thickness of the product;
g. and cutting and shaping the pressed paperboard to obtain the insulating paperboard.
Preferably, the size of the veneer in the step a needs to be increased by a proper margin compared with the insulating paperboard so as to be convenient for sizing by cutting after compression molding.
Preferably, the wet stack in the step b is as follows: adding water to the surface of the first paperboard until the water level uniformly covers the surface of the first paperboard, rolling by using a plastic roller, treating the surface of the second paperboard by the same method as the first paperboard, and then placing the lower surface of the second paperboard and the upper surface of the first paperboard together; then a third paperboard is processed, the upper surface of the second paperboard and the lower surface of the third paperboard are placed together, and the like, and then the edges of the layers of the paperboards are aligned and stacked.
Preferably, a water filter screen is arranged on the die in the step d. The water pressed down in the wet paper sheet can be drained out.
Further, the water filter screen is a stainless steel water filter screen.
Preferably, N in step e0The numerical range is 1-2 Mpa; n is a radical of1(G/F) S, wherein N1The pressure of a pressure gauge is Mpa, and G is the pressure kg/cm applied to the unit area of the wet paper board2F is the area of the oil cylinder of the press, and S is the area of the paper board (variable and variable according to different insulating paper boards).
Further, the value of G in the step e is 7 MPa.
Preferably, the heating of the mold in the step f is performed by using hot steam.
Preferably, in the step f, the mold is heated to 130 ℃, the unit pressure G is set to be 7Mpa, and the pressing time is shown in Table 1.
TABLE 1 product thickness and Hot pressing time List
| Product thickness (mm) | Hot pressing time (h) |
| 10 | 11±1.5 |
| 15 | 16±1.5 |
| 20 | 23±1.5 |
| 30 | 33±1.5 |
| 40 | 45±1.5 |
| 50 | 60±1.5 |
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
in the invention, water is added between layers of each single plate, and the rolling operation is uniform, so that the adjacent single plates can be better combined with each other; the cold pressing dewatering process is adopted, and the problem of wet paper board layer break caused by too high dewatering speed can be prevented by means of gradually increasing pressure; and the cold pressing dewatering process is a necessary process, if the process is omitted and hot pressing dewatering is directly adopted, the dewatering speed is too high, the wet paper board layer is not cracked, and qualified products cannot be obtained.
Compared with the original processing technology of the insulating paperboard with the thickness of more than 10mm, the invention does not need to apply adhesive between the single board layers, saves the cost of the adhesive and overcomes the product quality defect caused by the adhesive; the procedures of cutting, drying, cooling, gluing, secondary hot pressing and the like of the veneer are not needed, so that a large amount of time is saved, and the production efficiency is improved; and in addition, because no adhesive is added in the production, leftover materials (obtained by shearing when a corresponding product is prepared after pressing) can be directly collected and recycled for secondary pulping, so that the utilization rate of the material is improved.
Detailed Description
The technical solution of the present invention is further described below with reference to examples:
the first embodiment is as follows:the manufacturing method of the prior art (containing the adhesive) 50mm paperboard comprises the following steps:
1. and (3) cutting the finished veneer, namely taking 17 paper boards with the thickness of 3mm, and cutting the paper boards according to the size of the required product.
2. And (3) spacing supporting strips are arranged among the paper boards, the number of the supporting strips is determined according to the breadth of the finished product, and the spacing between the supporting strips is not more than 300 mm.
3. And (3) drying the paperboard padded with the stay bars in a hot air circulation drying oven, and drying at 125 ℃ for more than 36h on the basis that the moisture of the final paperboard is less than 1%.
4. And (3) cooling the paperboard, namely, moving the dried paperboard to a gluing area, and cooling by using a fan for about 2 hours.
5. Gluing, namely gluing the paperboards by using a gluing machine and stacking the paperboards in order.
6. And (3) hot pressing, namely feeding the glued paperboard into a press, heating to 130 ℃, setting the pressure to be 28 +/-0.5 Mpa, setting the hot pressing time to be 250min, setting the cooling time to be 250min, and opening the die after the cooling time is up.
7. And opening the die to take out the workpiece, namely unloading the laminated material from the press and operating to a processing area.
Example two:the invention relates to a method for manufacturing a 10mm paperboard, which comprises the following steps:
1. wet paper board taking: the thickness of the wet paper board corresponding to the finished product of 10mm is about 36mm, and the number of the wet paper boards is 1.
2. Wet paper board humidifying and stacking: adding water to the surface of the wet paper board until the water level uniformly covers the surface of the paper board, and rolling by using a plastic roller.
3. Standing: standing the stacked paperboards for 6h to make the moisture of the wet paper boards more uniform.
4. Wet paper plate upper die: the wet paper board was placed on a mold that was padded with a stainless steel mesh.
5. Pressing a wet paperboard:
pre-pressing: starting a pressing button, manually controlling, initially setting the pressure to be 1Mpa, gradually increasing the pressure, increasing the pressure by 0.2Mpa once, gradually decreasing the pressure along with the continuous loss of the moisture of the wet paper plate, increasing the pressure by 0.4Mpa after the pressure is decreased to the last set pressure value, and repeating the steps, and stopping pressing when the pressure is increased to 28 Mpa;
hot pressing: and starting a hot steam valve to heat the die to 130 ℃, setting the pressure to be 28 +/-0.5 MPa, and executing a hot pressing process for 11 hours.
6. And cutting and shaping the pressed paperboard to obtain the insulating paperboard.
Example three:manufacturing a 15mm paperboard:
1. wet paper board taking: the wet paper board is taken, the thickness of the wet paper board is 27mm, and the number of the wet paper boards is 2.
2. Wet paper board humidifying and stacking: adding water to the surface of the first paperboard until the water level uniformly covers the surface of the first paperboard, rolling by using a plastic roller, treating the surface of the second paperboard according to the same method of the first paperboard, and then placing the lower surface of the second paperboard and the upper surface of the first paperboard together, and stacking the second paperboard in an edge alignment manner.
3. Standing: standing the stacked paperboards for 6h to make the moisture of the wet paper boards more uniform.
4. Wet paper plate upper die: the wet paper board was placed on a mold that was padded with a stainless steel mesh.
5. Pressing a wet paperboard:
pre-pressing: starting a pressing button, manually controlling, initially setting the pressure to be 1Mpa, gradually increasing the pressure, increasing the pressure by 0.2Mpa once, gradually decreasing the pressure along with the continuous loss of the moisture of the wet paper plate, increasing the pressure by 0.4Mpa after the pressure is decreased to the last set pressure value, and repeating the steps, and stopping pressing when the pressure is increased to 28 Mpa;
hot pressing: and starting a hot steam valve to heat the die to 130 ℃, setting the pressure to be 28 +/-0.5 MPa, and executing a hot pressing process for 16 h.
6. And cutting and shaping the pressed paperboard to obtain the insulating paperboard.
Example four:manufacturing a 30mm paperboard:
1. wet paper board taking: the wet paper board is taken, the thickness of the wet paper board is 27mm, and the number of the wet paper board is 4.
2. Wet paper board humidifying and stacking: adding water to the surface of the first paperboard until the water level uniformly covers the surface of the first paperboard, rolling by using a plastic roller, treating the surface of the second paperboard by the same method as the first paperboard, and then placing the lower surface of the second paperboard and the upper surface of the first paperboard together; then a third paperboard is processed, the upper surface of the second paperboard and the lower surface of the third paperboard are placed together, and the like, and then the edges of the layers of the paperboards are aligned and stacked.
3. Standing: standing the stacked paperboards for 6h to make the moisture of the wet paper boards more uniform.
4. Wet paper plate upper die: the wet paper board was placed on a mold that was padded with a stainless steel mesh.
5. Pressing a wet paperboard:
pre-pressing: starting a pressing button, manually controlling, initially setting the pressure to be 1Mpa, gradually increasing the pressure, increasing the pressure by 0.2Mpa once, gradually decreasing the pressure along with the continuous loss of the moisture of the wet paper plate, increasing the pressure by 0.4Mpa after the pressure is decreased to the last set pressure value, and repeating the steps, and stopping pressing when the pressure is increased to 28 Mpa;
hot pressing: and starting a hot steam valve to heat the die to 130 ℃, setting the pressure to be 28 +/-0.5 MPa, and executing a hot pressing process for 33 h.
6. And cutting and shaping the pressed paperboard to obtain the insulating paperboard.
Example five:manufacturing a 50mm paperboard:
1. wet paper board taking: the wet paper board is taken, the thickness of the wet paper board is 36mm, and the number of the wet paper board is 5.
2. Wet paper board humidifying and stacking: adding water to the surface of the first paperboard until the water level uniformly covers the surface of the first paperboard, rolling by using a plastic roller, treating the lower surface of the second paperboard according to the same method of the first paperboard, then placing the lower surface of the second paperboard and the upper surface of the first paperboard together, placing the upper surface of the second paperboard and the lower surface of the third paperboard together, and so on, and aligning and stacking the edges of all layers of paperboards.
3. Standing: standing the stacked paperboards for 6h to make the moisture of the wet paper boards more uniform.
4. Wet paper plate upper die: the wet paper board was placed on a mold that was padded with a stainless steel mesh.
5. Pressing a wet paperboard:
pre-pressing: starting a pressing button, manually controlling, initially setting the pressure to be 1Mpa, gradually increasing the pressure, increasing the pressure by 0.2Mpa once, gradually decreasing the pressure along with the continuous loss of the moisture of the wet paper plate, increasing the pressure by 0.4Mpa after the pressure is decreased to the last set pressure value, and repeating the steps, and stopping pressing when the pressure is increased to 28 Mpa;
hot pressing: and starting a hot steam valve to heat the die to 130 ℃, setting the pressure to be 28 +/-0.5 MPa, and executing a hot pressing process for 60 hours.
6. And cutting and shaping the pressed paperboard to obtain the insulating paperboard.
And (3) comparison test:
the 15mm, 30mm and 50mm thick paperboards produced by the method (10mm thick paperboards are not common paperboards, so related products are not compared) and the paperboards with the same thickness prepared by adopting the adhesive in the prior art are detected, and the detection data are shown in table 2:
TABLE 2 comparison of test result data for products of the present invention and prior art
And (4) conclusion: from the above data, it can be seen that the products prepared by the present invention have similar compressibility and density compared with the products of the prior art, but the products of the present invention have improved rarity, bending strength and electrical strength, especially compared with ash, the ash content of the products of the present invention is less than half or more of that of the products of the prior art, and therefore, the product quality is remarkably improved.
It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Claims (7)
1. The preparation method of the insulating paperboard is characterized by comprising the following steps:
a. preparing a single plate: selecting the thickness and the number of the single boards according to the thickness of the insulating paper boards;
b. humidifying and stacking: adding water to the surfaces of the veneers, then rolling, and aligning and stacking the edges of the veneers after rolling; the method comprises the following specific steps: adding water to the surface of the first paperboard until the water level uniformly covers the surface of the first paperboard, rolling by using a plastic roller, treating the surface of the second paperboard by the same method as the first paperboard, and then placing the lower surface of the second paperboard and the upper surface of the first paperboard together; then processing a third paperboard, putting the upper side surface of the second paperboard and the lower surface of the third paperboard together, and repeating the steps, and then aligning and stacking the edges of the paperboards;
c. standing: standing the stacked wet paperboards for 4-8 hours; the moisture distribution in the wet paper board is more uniform;
d. and (3) upper die: placing the standing wet paper board on a mold;
e. cold pressing: pressing the wet paper board at normal temperature, and setting the initial pressure to be N according to the thickness of the insulating paper board0First pressing using a pressure of N0+0.2MPa, the pressure will gradually decrease to N with the continuous loss of water in the wet paper board0Then using a pressure of N0And +0.4Mpa, wherein the pressure increase range is 0.2Mpa each time when the pressing is carried out until the pressing pressure reaches the set termination pressure N1(ii) a Said N is0The numerical range is 1-2 Mpa; n is a radical of1= G/F S, wherein N1The reading Mpa of a pressure gauge, G is the pressure applied to the unit area of the wet paper board, F is the area of an oil cylinder of a press, and S is the area of the paper board;
f. hot pressing: heating the mold to 120-130 ℃, and adopting the pressure N1Pressing under +/-0.5 Mpa for a time set according to the thickness of the product;
g. and cutting and shaping the pressed paperboard to obtain the insulating paperboard.
2. The method of manufacturing an insulating paperboard according to claim 1, characterized by: and (b) adding a proper margin to the size of the single board in the step (a) compared with the insulating paperboard so as to facilitate the size cutting for shaping after the pressing and the forming.
3. The method of manufacturing an insulating paperboard according to claim 1, characterized by: and d, arranging a water filter screen on the die in the step d.
4. The method of manufacturing an insulating paperboard according to claim 1, characterized by: the value of G in said step e is 77 MPa.
5. The method of manufacturing an insulating paperboard according to claim 1, characterized by: and f, heating the mould in the step f by using hot steam.
6. The method of manufacturing an insulating paperboard according to claim 1, characterized by: and f, heating the mould in the step f by using hot steam.
7. The method of manufacturing an insulating paperboard according to claim 1, characterized by: and f, heating the die to 130 ℃, and setting the unit pressure G to be 7 MPa.
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Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1058935C (en) * | 1997-01-08 | 2000-11-29 | 苇河林业局电工层压木厂 | Composite insulating board and its producing technique |
| CN101913169A (en) * | 2010-06-30 | 2010-12-15 | 庄启程 | Processing method of end-blocked veneer |
| CN102296781A (en) * | 2011-05-27 | 2011-12-28 | 苏州凯牌木业有限公司 | Impregnated-paper laminated facing material, manufacturing thereof, wood floor faced with material and manufacturing thereof |
| CN102514055B (en) * | 2011-12-26 | 2014-11-19 | 广州易福诺木业有限公司 | Method for manufacturing waterproof board |
| CN103806345B (en) * | 2014-02-14 | 2016-04-20 | 长春高琦聚酰亚胺材料有限公司 | A kind of polyimide insulative cardboard and preparation method thereof |
| CN106393386B (en) * | 2016-11-22 | 2020-01-03 | 贺州隆源新材料有限公司 | Bamboo, paper-making solid waste artificial board containing fiber and plastic and manufacturing process thereof |
| CN107351455B (en) * | 2017-08-25 | 2020-02-04 | 山东输变电设备有限公司 | Hot pressing method for multilayer paperboard |
| CN110195374A (en) * | 2019-05-10 | 2019-09-03 | 镇江市鑫泰绝缘材料有限公司 | A kind of production method of insulating board |
| CN110219194B (en) * | 2019-06-06 | 2020-08-07 | 潍坊汇胜绝缘技术有限公司 | Production method for eliminating steam channel marks on surface of insulating paperboard |
| CN110344287A (en) * | 2019-07-02 | 2019-10-18 | 华南理工大学 | A kind of renewable fiberboard of high-penetration intensity and its environment-friendly preparation method thereof |
| CN110528336A (en) * | 2019-07-29 | 2019-12-03 | 华南理工大学 | A kind of high tensile high density fiberboard and its environment-friendly preparation method thereof |
| CN110901163B (en) * | 2019-12-13 | 2023-12-26 | 宁波弘泰包装新材料科技有限公司 | Production process of paper disc |
| CN111775509A (en) * | 2020-07-22 | 2020-10-16 | 浙江希望包装有限公司 | Corrugated carton and corrugated board processing technology |
| CN112172236B (en) * | 2020-10-26 | 2022-06-10 | 潍坊汇胜绝缘技术有限公司 | Preparation method of insulating paper tube |
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