CN105350390A - Preparation of corundum fiber insulating paper for transformers - Google Patents
Preparation of corundum fiber insulating paper for transformers Download PDFInfo
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- CN105350390A CN105350390A CN201510739339.8A CN201510739339A CN105350390A CN 105350390 A CN105350390 A CN 105350390A CN 201510739339 A CN201510739339 A CN 201510739339A CN 105350390 A CN105350390 A CN 105350390A
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- preparation
- insulating paper
- deionized water
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- corundum
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
- D21H15/10—Composite fibres
- D21H15/12—Composite fibres partly organic, partly inorganic
-
- 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
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/36—Inorganic fibres or flakes
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/07—Nitrogen-containing compounds
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/28—Starch
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/47—Condensation polymers of aldehydes or ketones
- D21H17/48—Condensation polymers of aldehydes or ketones with phenols
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/52—Epoxy resins
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/66—Salts, e.g. alums
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/71—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes
- D21H17/74—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes of organic and inorganic material
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/143—Agents preventing ageing of paper, e.g. radiation absorbing substances
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/18—Reinforcing agents
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/34—Ignifugeants
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Paper (AREA)
Abstract
The invention discloses preparation of a corundum fiber insulating paper for transformers. The corundum fiber insulating paper for transformers is prepared from the following raw materials by weight part: 12-15 of nano-titanium dioxide, 2-3 of phenolic resin, 500-550 of a pulp board, 1.3-1.5 of sodium silicate, 1-1.3 of sodium carboxymethyl cellulose, 2.3-2.6 of corundum fiber, 0.5-0.6 of ammonium polyphosphate, 0.8-0.9 of urea, 0.6-0.8 of hydroxymethyl starch, 0.2-0.4 of polyethylene oxide, and a proper amount of deionized water. The preparation method provided by the invention is simple, the raw materials are low in cost and have wide sources, the prepared insulating paper has good performance and high stability, and has good use prospect as an insulating part of transformers.
Description
Technical field
The present invention relates to transformer technology field, particularly relate to a kind of preparation of transformer corundum fibers insulating paper.
Background technology
Insulating paper is widely used as the insulating materials of the equipment such as motor, cable, capacitor and transformer, is also the main composition material of the insulating materials such as laminated product, composite and preimpregnation material.Due to the specific use of insulating paper, require it to possess characteristic that some are different from other paper kind, mainly comprises mechanical performance, electric property and heat endurance.And due to the difference of all kinds of electrical equipment environment for use, motor, chemical plant as run under wet heat condition often contact the aggressive chemistry medium of high concentration motor, having the motor etc. run under radioactive radiation, require that insulating paper also will have good physical and chemical performance and environmental suitability.The insulating paper adopting native cellulose to prepare just is widely used in the power equipment of various oil immersed type as insulating materials from the nineties in 19th century, although present insulating materials has had larger change and progress, but cellulose insulation paper has, and price is low, mechanical strength is large, size easily controls, the plurality of advantages such as excellent electrical properties, environmental friendliness after immersion oil, remain the first-selected insulating materials of oil-immersed type transformer, in order to improve the various performances of paper in the middle of traditional paper industry, multiple physico-chemical process is utilized to carry out modification to paper.Utilize inorganic filler to carry out modification insulating paper and can obtain the more excellent insulating paper of performance, but the domestic and international research for this respect is little at present.
Nano titanium oxide has very large specific area, therefore the just many and cellulose surface of the hydroxyl quantity produced on its surface is also with a large amount of hydroxyls, just provide condition for combining closely between nano-titania particle and cellulose, ensure nano titanium oxide adhesive rate on cellulose, and nano titanium oxide can also play good effect to the insulating properties of insulating oil.So the present invention selects nano titanium oxide to carry out modification to insulating paper.
Summary of the invention
The object of the invention is exactly the defect in order to make up prior art, provides a kind of preparation of transformer corundum fibers insulating paper.
The present invention is achieved by the following technical solutions:
A preparation for transformer corundum fibers insulating paper, is made up of the raw material of following weight portion: nano titanium oxide 12-15, phenolic resins 2-3, pulpboard 500-550, sodium metasilicate 1.3-1.5, sodium carboxymethylcellulose 1-1.3, corundum fibers 2.3-2.6, APP 0.5-0.6, urea 0.8-0.9, hydroxymethyl starch 0.6-0.8, poly(ethylene oxide) 0.2-0.4, deionized water are appropriate.
The preparation of described a kind of transformer corundum fibers insulating paper, be made up of following concrete steps:
(1) by nano titanium oxide dry 30min under 100 ° of C in an oven, be added to after cooling in 0.5Wt% silane coupler kh550 ethanol solution, then solution is carried out reflux condensation mode process, take out post-drying and mill stand-by;
(2) be that product prepared by the phenolic resins of 15-20% and step (1) mixes by solid content, stirring reaction 0.5-1h when being heated to 80 ° of C again, constant temperature keeps adding corundum fibers again and soaks 4-5h, pulls rear distilled water cleaning fiber number out for subsequent use all over post-drying;
(3) pulpboard is soaked 12h in deionized water, soaking after discongesting 6-8min fully utilizes beater to pull an oar, beating degree until slurry stops making beating to during 40-45 ° of SR, the slurry of preparation is put into fiber dissociation device, adding deionized water makes the concentration of slurry carry out mechanical treatment in 2-2.5%, obtains paper pulp turbid liquid for subsequent use;
(4) mixing of APP, urea, sodium carboxymethylcellulose, hydroxymethyl starch and sodium metasilicate is added the deionized water mixing and stirring of total times amount 6-8 times amount, product prepared by step (2) is added in paper pulp turbid liquid prepared by step (3), add above-mentioned mixed solution again to stir under 300 revs/min, finally pulp suspension is added in paper industry former and carries out dehydration forming, can obtain.
Advantage of the present invention is: the present invention adopts titanium dioxide surface modification, not easily assemble, it is made to be evenly distributed in paper pulp, and the insulating properties of insulating paper can be increased substantially, and by fiber impregnation in insulating resin, then solidification combing utilizes viscose solution and cellulose fibre mixed textile, the composite sheet of preparation substantially increases its mechanical performance, insulating properties, the effect of the aspect such as heat-resistant aging and intensity, the corundum fibers added can the toughness of reinforced insulation paper, intensity, the performance of the aspect such as high temperature resistant, the APP of adding, it is antistatic that urea and poly(ethylene oxide) etc. enhance insulating paper, fire-retardant, the performances such as heat endurance, preparation method of the present invention is simple, cost of material is low, wide material sources, the insulating paper performance of preparation is good, stability is high, insulating element as transformer has good prospect of the application.
Detailed description of the invention
A preparation for transformer corundum fibers insulating paper, is made up of the raw material of following weight portion (kilogram): nano titanium oxide 12, phenolic resins 2, pulpboard 500, sodium metasilicate 1.3, sodium carboxymethylcellulose 1, corundum fibers 2.3, APP 0.5, urea 0.8, hydroxymethyl starch 0.6, poly(ethylene oxide) 0.2, deionized water are appropriate.
The preparation of described a kind of transformer corundum fibers insulating paper, be made up of following concrete steps:
(1) by nano titanium oxide dry 30min under 100 ° of C in an oven, be added to after cooling in 0.5Wt% silane coupler kh550 ethanol solution, then solution is carried out reflux condensation mode process, take out post-drying and mill stand-by;
(2) by solid content be 15% phenolic resins and the product prepared of step (1) mix, then stirring reaction 0.5h when being heated to 80 ° of C, constant temperature keeps adding corundum fibers again and soaks 4h, pulls rear distilled water cleaning fiber number out for subsequent use all over post-drying;
(3) pulpboard is soaked 12h in deionized water, soaking after discongesting 6min fully utilizes beater to pull an oar, beating degree until slurry stops making beating to during 40 ° of SR, the slurry of preparation is put into fiber dissociation device, adding deionized water makes the concentration of slurry carry out mechanical treatment in 2%, obtains paper pulp turbid liquid for subsequent use;
(4) mixing of APP, urea, sodium carboxymethylcellulose, hydroxymethyl starch and sodium metasilicate is added the deionized water mixing and stirring of total times amount 6 times amount, product prepared by step (2) is added in paper pulp turbid liquid prepared by step (3), add above-mentioned mixed solution again to stir under 300 revs/min, finally pulp suspension is added in paper industry former and carries out dehydration forming, can obtain.
Its performance test of the insulating paper prepared according to the present embodiment is as follows: breakdown voltage is 3.6KV, dielectric strength is 38KV/mm, the fire-retardant rank of insulating paper is V0 level, paper whiteness>=80%, dry tensile strength is 3.9KN/m, wet tensile (strength) is 0.53KN/m, suction head 55mm, air permeability is 20 ± 4s, and specific insulation is 0.9 × 10
6, sheet resistance is 4.0 × 10
4, dielectric constant is 5.2, and dielectric dissipation factor is 0.041.
Claims (2)
1. the transformer preparation of corundum fibers insulating paper, it is characterized in that, be made up of the raw material of following weight portion: nano titanium oxide 12-15, phenolic resins 2-3, pulpboard 500-550, sodium metasilicate 1.3-1.5, sodium carboxymethylcellulose 1-1.3, corundum fibers 2.3-2.6, APP 0.5-0.6, urea 0.8-0.9, hydroxymethyl starch 0.6-0.8, poly(ethylene oxide) 0.2-0.4, deionized water are appropriate.
2. the preparation of a kind of transformer corundum fibers insulating paper according to claim 1, is characterized in that, be made up of following concrete steps:
(1) by nano titanium oxide dry 30min under 100 ° of C in an oven, be added to after cooling in 0.5Wt% silane coupler kh550 ethanol solution, then solution is carried out reflux condensation mode process, take out post-drying and mill stand-by;
(2) be that product prepared by the phenolic resins of 15-20% and step (1) mixes by solid content, stirring reaction 0.5-1h when being heated to 80 ° of C again, constant temperature keeps adding corundum fibers again and soaks 4-5h, pulls rear distilled water cleaning fiber number out for subsequent use all over post-drying;
(3) pulpboard is soaked 12h in deionized water, soaking after discongesting 6-8min fully utilizes beater to pull an oar, beating degree until slurry stops making beating to during 40-45 ° of SR, the slurry of preparation is put into fiber dissociation device, adding deionized water makes the concentration of slurry carry out mechanical treatment in 2-2.5%, obtains paper pulp turbid liquid for subsequent use;
(4) mixing of APP, urea, sodium carboxymethylcellulose, hydroxymethyl starch and sodium metasilicate is added the deionized water mixing and stirring of total times amount 6-8 times amount, product prepared by step (2) is added in paper pulp turbid liquid prepared by step (3), add above-mentioned mixed solution again to stir under 300 revs/min, finally pulp suspension is added in paper industry former and carries out dehydration forming, can obtain.
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CN201510739339.8A CN105350390A (en) | 2015-11-04 | 2015-11-04 | Preparation of corundum fiber insulating paper for transformers |
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CN201510739339.8A CN105350390A (en) | 2015-11-04 | 2015-11-04 | Preparation of corundum fiber insulating paper for transformers |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106758458A (en) * | 2016-12-30 | 2017-05-31 | 铜陵三佳变压器科技股份有限公司 | A kind of transformer of heat-resistant stable aramid fiber based insulation paper and preparation method thereof |
CN106758543A (en) * | 2016-12-30 | 2017-05-31 | 铜陵三佳变压器科技股份有限公司 | A kind of transformer of low water absorbable low-shrinkage aramid fiber based insulation paper and preparation method thereof |
CN106758460A (en) * | 2016-12-30 | 2017-05-31 | 铜陵三佳变压器科技股份有限公司 | A kind of transformer of breakdown strength high aramid fiber based insulation paper and preparation method thereof |
CN106758459A (en) * | 2016-12-30 | 2017-05-31 | 铜陵三佳变压器科技股份有限公司 | A kind of transformer of chitin modification aramid fiber based insulation paper and preparation method thereof |
CN106758544A (en) * | 2016-12-30 | 2017-05-31 | 铜陵三佳变压器科技股份有限公司 | A kind of low-loss transformer aramid fiber based insulation paper and preparation method thereof |
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CN104452435A (en) * | 2014-10-31 | 2015-03-25 | 华南理工大学 | Method for making high-performance bleached impregnated flame-retardant insulating paper |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106758458A (en) * | 2016-12-30 | 2017-05-31 | 铜陵三佳变压器科技股份有限公司 | A kind of transformer of heat-resistant stable aramid fiber based insulation paper and preparation method thereof |
CN106758543A (en) * | 2016-12-30 | 2017-05-31 | 铜陵三佳变压器科技股份有限公司 | A kind of transformer of low water absorbable low-shrinkage aramid fiber based insulation paper and preparation method thereof |
CN106758460A (en) * | 2016-12-30 | 2017-05-31 | 铜陵三佳变压器科技股份有限公司 | A kind of transformer of breakdown strength high aramid fiber based insulation paper and preparation method thereof |
CN106758459A (en) * | 2016-12-30 | 2017-05-31 | 铜陵三佳变压器科技股份有限公司 | A kind of transformer of chitin modification aramid fiber based insulation paper and preparation method thereof |
CN106758544A (en) * | 2016-12-30 | 2017-05-31 | 铜陵三佳变压器科技股份有限公司 | A kind of low-loss transformer aramid fiber based insulation paper and preparation method thereof |
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