CN113430868A - Insulating paperboard with metal defects and preparation method thereof - Google Patents
Insulating paperboard with metal defects and preparation method thereof Download PDFInfo
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- CN113430868A CN113430868A CN202110654365.6A CN202110654365A CN113430868A CN 113430868 A CN113430868 A CN 113430868A CN 202110654365 A CN202110654365 A CN 202110654365A CN 113430868 A CN113430868 A CN 113430868A
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- 230000007547 defect Effects 0.000 title claims abstract description 146
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 111
- 239000002184 metal Substances 0.000 title claims abstract description 111
- 239000011087 paperboard Substances 0.000 title claims abstract description 96
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 239000000123 paper Substances 0.000 claims abstract description 126
- 239000012535 impurity Substances 0.000 claims abstract description 30
- 230000002950 deficient Effects 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 claims abstract description 19
- 238000004537 pulping Methods 0.000 claims abstract description 16
- 238000011049 filling Methods 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 9
- 239000007769 metal material Substances 0.000 claims abstract description 9
- 238000007731 hot pressing Methods 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 28
- 238000002474 experimental method Methods 0.000 claims description 25
- 238000001291 vacuum drying Methods 0.000 claims description 21
- 239000002131 composite material Substances 0.000 claims description 13
- 238000009413 insulation Methods 0.000 claims description 12
- 238000007670 refining Methods 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 10
- 238000010009 beating Methods 0.000 claims description 8
- 238000009966 trimming Methods 0.000 claims description 5
- 238000007666 vacuum forming Methods 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 238000004080 punching Methods 0.000 claims description 4
- 208000005156 Dehydration Diseases 0.000 claims description 3
- 230000018044 dehydration Effects 0.000 claims description 3
- 238000006297 dehydration reaction Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 7
- 238000011161 development Methods 0.000 abstract description 3
- 238000001914 filtration Methods 0.000 abstract description 3
- 238000011160 research Methods 0.000 abstract description 3
- 238000000227 grinding Methods 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- 238000003756 stirring Methods 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- 239000010410 layer Substances 0.000 description 10
- 239000000853 adhesive Substances 0.000 description 8
- 230000001070 adhesive effect Effects 0.000 description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 229910052742 iron Inorganic materials 0.000 description 7
- 238000001035 drying Methods 0.000 description 5
- 239000003292 glue Substances 0.000 description 5
- 239000012790 adhesive layer Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 238000010030 laminating Methods 0.000 description 3
- 239000011111 cardboard Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
Images
Classifications
-
- 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
- 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
- B31D—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER, NOT PROVIDED FOR IN SUBCLASSES B31B OR B31C
- B31D1/00—Multiple-step processes for making flat articles ; Making flat articles
- B31D1/0075—Multiple-step processes for making flat articles ; Making flat articles by assembling, e.g. by laminating
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J3/00—Manufacture of articles by pressing wet fibre pulp, or papier-mâché, between moulds
- D21J3/12—Manufacture of articles by pressing wet fibre pulp, or papier-mâché, between moulds of sheets; of diaphragms
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/20—Preparation of articles or specimens to facilitate testing
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Thermal Insulation (AREA)
- Laminated Bodies (AREA)
Abstract
The invention discloses an insulating paperboard with metal defects and a preparation method thereof, wherein the preparation method comprises the following steps: firstly, pulping a raw material pulp board by a pulper pulping refiner, filtering to obtain pure liquid pulp, uniformly stirring the pulp, and sending the pulp into a wet paper former to obtain a wet paper blank; secondly, manufacturing defects with corresponding sizes on the wet paper by using a machine tool grinding tool according to the sizes of the required metal impurity defects, filling the defects with metal sheets with the same sizes as the gaps to obtain wet paper blanks with the metal impurity filling defects, placing the defective wet paper containing the metal sheets in the middle of two intact wet paper without defects, and performing vacuum pressurization and water suction to manufacture the wet paper blanks with the sandwich structure containing the metal impurity filling defective wet paper. The invention can be used for manufacturing the insulating paper boards containing the impurity defects of different metal materials, meets the requirements of experimental research on different types of defect models, and is favorable for accurately obtaining the development rule of partial discharge caused by the metal defects in a high-voltage test.
Description
Technical Field
The invention relates to the technical field of high voltage and insulation, in particular to an insulating paperboard with metal defects and a preparation method thereof.
Background
The converter transformer is core equipment in ultrahigh voltage direct current transmission in China, and the stable operation of the converter transformer plays a crucial role in the reliable operation of a power grid. In the engineering batch production of the insulating paper boards in the transformer oil paper insulating composite structure, the situation that metal foreign bodies are mixed in the paper boards can be inevitably generated, so that the paper boards contain tiny defects, partial discharge is caused, and the irreversible damage of the insulating property is caused. Metal defects are a common defect type, which causes non-uniform field intensity inside the transformer, and partial discharge occurs. The development state of partial discharge caused by metal defects is observed and measured in a high-voltage test, so that the method is very important for making a reasonable transformer maintenance plan, and has important academic significance and value. Insulating cardboard with metal defects is an essential part of the indispensable defect model.
When the method is used for analyzing the insulating discharge characteristic of the oiled paper caused by metal defects in a high-voltage experiment, the insulated paperboards containing the metal defects with different sizes, different metal impurities and specific different positions need to be prepared, a metal defect model applies three layers of insulated paperboards with hollow structures, the existing preparation method mainly uses other insulating adhesive glues such as polyester resin to paste the insulated paperboards, the defects are very large, if bubbles are easy to appear on the part of an adhesive layer, the thickness of the adhesive layer affects the experiment measurement, and other impurities are generated under the high-voltage condition to form interface polarization. The insulating paperboard containing glue causes local damage, and the insulating characteristic of the insulating paperboard containing metal defects applied in practical engineering cannot be accurately simulated.
Disclosure of Invention
The present invention is directed to an insulating paperboard having metal defects and a method for manufacturing the same, which solves the problems set forth in the background art.
According to the invention, the insulating paperboard with metal defects is prepared by filling metal in the defects cut in the paperboard manufacturing process and utilizing a vulcanizing machine hot-pressing drying wet paper blank method, so that the components of other parts are completely the same as those of the insulating paperboard in the transformer oil paper insulating structure except for the metal defects, the model requirement on the insulating paperboard with metal defects in a high-voltage discharge test is met, the conditions that the insulating adhesive is not fully bonded, bubbles appear in the adhesive layer to generate other impurities, and the thickness of the adhesive layer influences the experimental measurement are well avoided, and the development state of partial discharge caused by the metal defects is better monitored.
The purpose of the invention is realized by the following technical scheme: an insulation paperboard with metal defects is prepared by filling the paperboard defects with metal impurities.
An insulation paper board with metal defects comprises two pieces of unnotched wet paper and a defective wet paper, wherein the center of the defective wet paper is provided with a size defect, the two pieces of unnotched wet paper are an upper layer and a lower layer, and the defective wet paper is positioned in the middle of the unnotched wet paper; the defects are in the shape of a cylinder, a triangular prism, a cone, a regular hexahedron or a regular tetrahedron, and the number and the shape of the defects are selected according to different simulated defect conditions.
A method of manufacturing an insulating paperboard having metal defects, the method comprising the steps of:
(1) preparing a wet paper blank: pulping the pulp board by a pulper, and then feeding the pulp board to a refiner for refining, wherein the refining degree is to ensure that the beating degree of pulp reaches 30-40 DEG SR, so as to obtain liquid pulp;
(2) sending the pulp into a pulp pool by using a pulp pump, carrying out filter residue treatment by using a filter residue device, and sending the pure pulp into a wet paper forming device by using the pulp pump to prepare formed wet paper;
(3) pressure dehydration treatment: dehydrating the wet paper to 55-65% by vacuum pressurization, and taking out a wet paper blank;
(4) manufacturing an insulating paperboard containing metal impurity defects:
a. cutting out depressions or gaps with corresponding sizes and thicknesses on the wet paper blank by using a punching and cutting mode according to the size of metal defects required by experiments;
b. according to the experiment, metal sheets with the same size and size are manufactured, and the metal sheets are filled in the paperboard with defects;
c. placing the defective wet paper containing the metal sheet between two intact wet paper without defects to form a sandwich structure wet paper blank containing the defective wet paper filled with metal impurities, pressurizing the sandwich structure wet paper blank together with a mold until the water content reaches 40%, and taking out the sandwich structure wet paper blank;
(5) hot pressing and vacuum forming: feeding the sandwich-structured wet paper blank in the step (4) into a hot-pressing vulcanizing machine for hot pressing and vacuum drying treatment;
taking out the hot-pressed paperboard, and trimming the edge to obtain the composite insulating paperboard with the sandwich structure and the metal defect, wherein the composite insulating paperboard can be used in a high-voltage experiment; the intermediate layer contains defective wet paper and is put into a metal sheet having the same size to form a metal defect.
And (2) further, the pulp board is sent into a pulper for pulping in the step (1), then the pulp board is sent into a pulping machine for pulping, the pulping degree is that the beating degree of pulp reaches 30-40 DEG SR, liquid paper pulp is obtained, a pulp pump is used for sending the pulp into a pulp tank, a residue filter is used for carrying out residue filtering treatment, the pure pulp is sent into a wet paper former by the pulp pump to be made into formed wet paper, water is pumped under pressure, and the wet paper blank is taken out when the water content reaches 55% -65%.
Further, the hot pressing condition in the step (5) is that the pressing is carried out for 10-20 min under the pressure of 15-20 MPa.
Further, the step (5) of vacuum drying the water-containing paperboard is to perform vacuum drying in a vacuum drying oven with the vacuum degree of 0.01-0.06 MPa at the temperature of 100-110 ℃, and the drying time is 2-3 h.
Further, different metal materials are adopted to fill the metal impurity defects in the step (4), the specific positions of the metal impurities are set according to actual use requirements, and the metal impurities are the same as the metal defects which are accidentally generated in the production process of the insulating paperboard in the actual engineering field.
Further, the defects of the wet paper blank design are filled with metal flakes, forming metal defects.
Further, in the step (4), the insulating paper boards with different metal material defects are formed in the sandwich wet paper blank structure in the hot pressing process, so that different types of models with metal defects required by a high-voltage experiment are met.
Furthermore, the diameter of the defect in the sandwich structure of the metal defect is 0.1-3mm, and the height is 0.1-1 mm.
Compared with the prior art, the invention adopts the hot-pressing technology of the vulcanizer to prepare the insulating paperboard with metal defects, and has the beneficial effects that:
(1) the invention utilizes the sandwich wet paper blank with the defects filled by the metal sheet to prepare the insulating paper board with the metal defects, freely cuts the defects with the required size, fills the defects with the metal sheet, and obtains the paper boards with the metal defects of different sizes, different metal materials and different specific positions where the defects are located in the hot-pressing vacuum drying process.
(2) In the process of laminating the multilayer insulating paper boards, no insulating adhesive is used, and a wet paper hot pressing mode is adopted for laminating, so that the defect that the insulating paper board with metal defects used in the insulating discharge characteristic of the oil paper contains the adhesive and cannot accurately simulate the insulating characteristic of the insulating paper board with the metal defects applied in practical engineering is overcome, and the research that the discharge characteristic is influenced because the adhesive does not produce other impurities under various working conditions such as high temperature is avoided.
(3) In the invention, the defects of the wet paper blank design are filled by the metal sheets made of different materials, so that the requirements of high-voltage tests on different types of insulating paper boards with metal defects are met.
(4) And the vacuum drying treatment avoids the interference to the experiment caused by the water content of the paperboard in the high-pressure experiment process.
Drawings
Fig. 1 is a flow chart for preparing an insulating paperboard containing metal defects.
FIG. 2 is a schematic representation of a sandwich wet web containing foil filled defects.
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 embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
As shown in fig. 1-2, an insulating paperboard having metal defects is prepared by filling paperboard defects with a metal foil.
In the present embodiment, it is preferred that,
an insulation board with metal defects comprises three parts of two unnotched wet paper 3 and a defective wet paper 2, wherein the defective wet paper 2 is provided with a size defect 1 at the center, the two unnotched wet paper 3 are an upper layer and a lower layer, and the defective wet paper 2 is positioned in the middle of the unnotched wet paper 3;
the defects 1 are in the shape of a cylinder, a triangular prism, a cone, a regular hexahedron or a regular tetrahedron, and the number and the shape of the defects 1 are selected according to different simulated defect conditions.
A method of manufacturing an insulating paperboard having metal defects, the method comprising the steps of:
(1) preparing a wet paper blank: pulping the pulp board by a pulper, and then feeding the pulp board to a refiner for refining, wherein the refining degree is to ensure that the beating degree of pulp reaches 30-40 DEG SR, so as to obtain liquid pulp;
(2) sending the pulp into a pulp pool by using a pulp pump, carrying out filter residue treatment by using a filter residue device, and sending the pure pulp into a wet paper forming device by using the pulp pump to prepare formed wet paper;
(3) pressure dehydration treatment: dehydrating the wet paper to 55-65% by vacuum pressurization of a vulcanizer, and taking out a wet paper blank;
(4) manufacturing of insulating paper board with metal defects:
a. cutting out depressions or gaps with corresponding sizes and thicknesses on the formed wet paper blank by using a punching machine and a cutting mode according to the size of the defect required by the experiment;
b. according to the defect size required by the experiment, manufacturing metal sheets with the same size and size, and filling the metal sheets in the paperboard with the defects;
c. placing the defective wet paper containing the metal sheet between two intact unnotched wet paper to form a sandwich structure wet paper blank containing the defective wet paper filled with the metal sheet, pressurizing the sandwich structure wet paper blank together with a mold until the water content reaches 40%, and taking out the sandwich structure wet paper blank;
(5) hot pressing and vacuum forming: conveying the sandwich-structured wet paper blank in the step (4) into a hot-pressing vulcanizing machine for hot pressing and performing vacuum drying treatment by using a vacuum drying oven;
taking out the hot-pressed paperboard, and trimming the edge to obtain the composite insulating paperboard with the sandwich structure and the metal defect, wherein the composite insulating paperboard can be used in a high-voltage experiment; the intermediate layer contains defective wet paper and metal thin sheet with the same size is put in the intermediate layer to form metal defect.
The size and the position of the defect can be freely manufactured according to the experimental requirement, and a machine tool grinding tool is used, so that the phenomenon that redundant corners are generated by manual cutting is avoided, and metal sheets with corresponding sizes are filled.
No insulating adhesive glue is used in the laminating hot pressing process of the sandwich wet paper blank structure model.
The hot pressing pressure condition is 15-20 MPa, the paperboard fiber damage can be caused by overlarge pressure, and the multilayer wet paperboard has poor adhesion degree due to too small pressure.
In the hot pressing and vacuum drying processes, water in the wet paper blank is absorbed and evaporated into steam at the temperature of 100 ℃ according to the physical principle, so that the influence on the test result caused by the water content of the paper board in the high-pressure experiment process is avoided.
In the embodiment, the pulp board is sent into a pulper for pulping in the step (1), then sent into a refiner for refining, the refining degree is that the beating degree of the pulp reaches 30-40 DEG SR, liquid pulp is obtained, a pulp pump is used for sending the pulp into a pulp tank, a residue filter is used for filtering residue, the pure pulp is sent into a wet paper former by the pulp pump to be made into formed wet paper, water is pumped under pressure, and the wet paper blank is taken out when the water content reaches 55% -65%.
In this embodiment, the hot pressing in the step (5) is performed under a pressure of 15 to 20MPa for 10 to 20 min.
In this embodiment, the step (5) of vacuum drying the water-containing paperboard is to perform vacuum drying in a vacuum drying oven with a vacuum degree of 0.01 to 0.06MPa at a temperature of 100 to 110 ℃, and the drying time is 2 to 3 hours.
In the embodiment, the metal impurity defects in the step (4) are filled with different metal materials, and the specific positions of the metal impurities are set according to actual use requirements, and are the same as the metal defects which are accidentally generated in the production process of the insulating paperboard in the actual engineering field.
The insulation paper boards with different sizes, different metal materials and different defect positions are made according to actual use requirements, and the requirements of high-voltage tests on different types of insulation paper boards with metal defects are met.
In this embodiment, the defects of the wet paper blank design are filled with metal sheets of different materials, so as to form the insulating paper board containing metal defects, which is researched by different types of experiments.
In this embodiment, in the step (4), the insulating paperboard with metal defects is formed in the sandwich wet paper blank structure in the hot pressing process of the vulcanizer, and the components of the insulating paperboard except the metal defect position are completely the same as those of the insulating paperboard in the actual engineering field.
In this embodiment, the defect diameter of the sandwich structure with metal defects is 0.1-3mm, and the height is 0.1-1 mm.
The sizes of the defects, the metal materials and the specific positions of the defects can be designed, the generated defects cannot be communicated, the metal defects are the same as the metal defects which are accidentally generated in the production process of the insulating paperboard in the actual engineering field, and the metal defects have higher pertinence in the high-voltage test research compared with the insulating paperboard which is actually produced.
The sandwich wet paper blank structure forms the insulating paper board with the metal impurity defect in the hot pressing process of the vulcanizing machine, does not need to use any insulating adhesive glue, has the same components as the insulating paper board in the field of practical engineering, and avoids the influence of the insulating adhesive glue on the experiment in the high-temperature and high-pressure process.
The first embodiment is as follows:
as shown in fig. 1-2, the method for preparing the insulating paperboard with the defect of metallic aluminum impurity comprises the following steps:
(1) wet paper production
1) And (3) pulping the pulp board by a pulper, and then feeding the pulp board to a refiner for refining, wherein the refining degree is to ensure that the beating degree of pulp reaches 35 DEG SR, so as to obtain liquid pulp.
2) And (3) sending the pulp into a pulp pond by using a pulp pump, carrying out filter residue treatment by using a filter residue device, and sending the pure pulp into a wet paper forming device by using the pulp pump to prepare formed wet paper.
3) And (4) carrying out vacuum pressurization by using a vulcanizer, dehydrating the wet paper to 55%, and taking out the wet paper blank.
(2) Defect creation
1) And (3) punching and cutting the formed wet paper blank into a depression or a notch with corresponding size and thickness on the wet paper blank by using a punch press according to the size of the defect required by the experiment, wherein the middle layer wet paper is shown as 2 in the figure 2, and the diameter of the defect 1 in the figure 2 is determined to be 0.2mm, 1.2mm, 2.1mm and the height of the defect 1 in the figure 2 is determined to be 0.5mm according to the experiment requirement.
The depressions or the notches are in the shape of a regular hexahedron or a regular tetrahedron; one or more depressions or notches are arranged along the inner ring of the wet paper blank;
the other form of the depressions or the notches is arranged in a ring or matrix manner;
2) according to the defect size required by the experiment, aluminum flakes having the same size as the defect, a diameter of 0.2mm, a diameter of 1.2mm, a diameter of 2.1mm, and a height of 0.5mm were produced, and the aluminum flakes were filled in a cardboard having the defect to constitute wet paper filled with aluminum metal in the defect, as shown by reference numeral 2 in fig. 2.
3) The defective wet paper containing metallic aluminum impurities, 2, is placed between two intact wet papers, 3, 2, and fixed, to form a sandwich structure wet paper blank containing the defective wet paper filled with aluminum sheets, 2, and pressed together with a mold until the water content reaches 40%, and the sandwich structure wet paper blank is taken out.
(3) Hot pressing and vacuum forming
1) And (3) conveying the wet paper blank with the sandwich structure in the figure 2 into a hot-pressing vulcanizing machine for hot pressing, wherein the hot pressing condition is that the pressing is carried out for 14min under the pressure of 13 MPa.
2) The process of vacuum drying the water-containing paperboard is to carry out vacuum drying in a vacuum drying oven with the vacuum degree of 0.01MPa at the temperature of 105 ℃, and the drying time is 3 h.
3) And taking out the hot-pressed paperboard, and performing edge trimming to obtain the sandwich structure composite insulating paperboard with metal aluminum impurity defects, wherein the defect diameters are 0.2mm, 1.2mm and 2.1mm respectively, and the height is 0.5mm, and the sandwich structure composite insulating paperboard can be put into a high-voltage experiment for use.
The second embodiment is as follows:
as shown in fig. 1-2, the method for preparing the insulating paperboard with the defect of metallic iron impurities comprises the following steps:
(1) wet paper production
1) And (3) pulping the pulp board by a pulper, and then feeding the pulp board to a refiner for refining, wherein the refining degree is to ensure that the beating degree of pulp reaches 40 DEG SR, so as to obtain liquid pulp.
2) And (3) sending the pulp into a pulp pond by using a pulp pump, carrying out filter residue treatment by using a filter residue device, and sending the pure pulp into a wet paper forming device by using the pulp pump to prepare formed wet paper.
3) And (4) carrying out vacuum pressurization by using a vulcanizer, dehydrating the wet paper to 65%, and taking out the wet paper blank.
(2) Defect creation
1) And (3) cutting the formed wet paper blank into a depression or a notch with corresponding size and thickness by using a punch press and a cutting mode according to the size of the defect required by the experiment, wherein the wet paper is the intermediate layer wet paper shown as a mark 2 in figure 2, and the diameter of the defect 1 determined by the wet paper according to the experiment is 0.5mm, 1mm, 1.5mm and the height is 0.3mm respectively.
2) According to the size of the defect, iron flakes having the same size as the defect, a diameter of 0.5mm, a diameter of 1mm, a diameter of 1.5mm, and a height of 0.3mm, respectively, were produced, and the iron flakes were filled in a paper board having the defect to constitute a defective wet paper containing metallic iron impurities, as shown by reference numeral 2 in fig. 2.
The recess or the notch is in a triangular prism shape or a conical shape; one or more depressions or notches are arranged along the inner ring of the wet paper blank;
the other form of the depressions or the notches is arranged in a ring or matrix manner;
3) the defective wet paper containing metallic iron impurities, as shown in fig. 2, is placed between two intact unnotched wet papers, as shown in fig. 3 of fig. 2, and after fixation, a sandwich-structured wet paper blank containing the defective wet paper filled with iron sheets is formed, as shown in fig. 2, and pressurized together with a mold to a water content of 45%, and the sandwich-structured wet paper blank is taken out.
(3) Hot pressing and vacuum forming
1) And (3) conveying the wet paper blank with the sandwich structure in the figure 2 into a hot-pressing vulcanizer for hot pressing, wherein the hot pressing condition is that the pressing is carried out for 20min under the pressure of 20 MPa.
2) The process of vacuum drying the water-containing paperboard is to carry out vacuum drying in a vacuum drying oven with the vacuum degree of 0.05MPa at the temperature of 110 ℃, and the drying time is 2.5 h.
3) And taking out the hot-pressed and dried paperboard, and trimming the edge to obtain the composite insulating paperboard with the sandwich structure, wherein the composite insulating paperboard has the defects of metallic iron impurities, the diameters of the defects are 0.5mm, 1mm and 1.5mm, and the height of the composite insulating paperboard is 0.3mm, and the composite insulating paperboard can be used in a high-voltage experiment.
Finally, it is noted that the above-mentioned embodiments illustrate rather than limit the invention, and that, although the present invention has been described in detail by way of examples, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention as defined by the appended claims.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. An insulating paperboard having metal defects, characterized in that: the insulating paperboard is prepared by filling defects of paperboards with metal impurities.
2. An insulating paperboard having metal defects, characterized in that: the insulating paperboard comprises three parts, namely two unnotched wet paper (3) and a defective wet paper (2), wherein the center of the defective wet paper (2) is provided with a size defect (1), the two unnotched wet paper (3) are an upper layer and a lower layer, and the defective wet paper (2) is positioned in the middle of the unnotched wet paper (3);
the defects (1) are in the shape of a cylinder, a triangular prism, a cone, a regular hexahedron or a regular tetrahedron, and the number and the shape of the defects (1) are selected according to different simulated defect conditions.
3. The method for preparing an insulation paperboard with metal defects according to claim 1 or 2, characterized in that the method comprises the following steps:
(1) preparing a wet paper blank: pulping the pulp board by a pulper, and then feeding the pulp board to a refiner for refining, wherein the refining degree is to ensure that the beating degree of pulp reaches 30-40 DEG SR, so as to obtain liquid pulp;
(2) sending the pulp into a pulp pool by using a pulp pump, carrying out filter residue treatment by using a filter residue device, and sending the pure pulp into a wet paper forming device by using the pulp pump to prepare formed wet paper;
(3) pressure dehydration treatment: dehydrating the wet paper to 55-65% by vacuum pressurization, and taking out a wet paper blank;
(4) manufacturing an insulating paperboard containing metal impurity defects:
a. cutting out depressions or gaps with corresponding sizes and thicknesses on the wet paper blank by using a punching and cutting mode according to the size of metal defects required by experiments;
b. according to the experiment, metal sheets with the same size and size are manufactured, and the metal sheets are filled in the paperboard with defects;
c. placing the defective wet paper containing the metal sheet between two intact wet paper without defects to form a sandwich structure wet paper blank containing the defective wet paper filled with metal impurities, pressurizing the sandwich structure wet paper blank together with a mold until the water content reaches 40%, and taking out the sandwich structure wet paper blank;
(5) hot pressing and vacuum forming: feeding the sandwich-structured wet paper blank in the step (4) into a hot-pressing vulcanizing machine for hot pressing and vacuum drying treatment;
taking out the hot-pressed paperboard, and trimming the edge to obtain the composite insulating paperboard with the sandwich structure and the metal defect, wherein the composite insulating paperboard can be used in a high-voltage experiment; the intermediate layer contains defective wet paper and is put into a metal sheet having the same size to form a metal defect.
4. The method for preparing an insulation paperboard with metal defects according to claim 3, wherein: and (2) feeding the pulp board into a pulper for pulping, feeding the pulp board into a pulping machine for pulping, wherein the pulping degree is that the beating degree of pulp reaches 30-40 DEG SR to obtain liquid pulp, feeding the pulp into a pulp tank by using a pulp pump, carrying out filter residue treatment by using a filter residue device, feeding pure pulp into a wet paper forming device by using the pulp pump to prepare formed wet paper, pumping water under pressure, and taking out wet paper blanks when the water content reaches 55-65%.
5. The method for preparing an insulation paperboard with metal defects according to claim 3, wherein: and (5) pressing for 10-20 min under the condition of hot pressing at 15-20 MPa.
6. The method for preparing an insulation paperboard with metal defects according to claim 3, wherein: and (5) performing vacuum drying on the water-containing paperboard in a vacuum drying oven with the vacuum degree of 0.01-0.06 MPa at the temperature of 100-110 ℃ for 2-3 h.
7. The method for preparing an insulation paperboard with metal defects according to claim 3, wherein: filling the metal impurity defects in the step (4) with different metal materials, and setting the specific positions of the metal impurities according to actual use requirements, wherein the specific positions of the metal impurities are the same as the metal defects which are accidentally generated in the production process of the insulating paperboard in the actual engineering field.
8. The method for preparing an insulation paperboard with metal defects according to claim 3, wherein: the defects of the wet paper blank design are filled with metal flakes, forming metal defects.
9. The method of manufacturing an insulating paperboard with metal defects according to claim 3, characterized in that: and (4) forming the insulating paperboard with different metal material defects in the hot pressing process of the sandwich wet paper blank structure in the step (4), so that different types of models with metal defects required by a high-voltage experiment are met.
10. The method of manufacturing an insulating paperboard with metal defects according to claim 3, characterized in that: the diameter of the defect in the sandwich structure of the metal defect is 0.1-3mm, and the height is 0.1-1 mm.
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