CN101462105B - Cooling method and cooling system after baking colorful coated steel plate paint film - Google Patents
Cooling method and cooling system after baking colorful coated steel plate paint film Download PDFInfo
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- CN101462105B CN101462105B CN200810156836.5A CN200810156836A CN101462105B CN 101462105 B CN101462105 B CN 101462105B CN 200810156836 A CN200810156836 A CN 200810156836A CN 101462105 B CN101462105 B CN 101462105B
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Abstract
The invention discloses a system for cooling a color painted steel strip subjected to coating and roasting, which comprises a cooling water spraying unit, wherein the unit is provided with a spray exhaust pipe which only sprays the cooling water to the rear layer of the color painted steel strip and cannot spray the cooling water to the facade layer of the color painted steel strip when the color painted steel strip is cooled. The cooling system can also comprise a supporting roller water indirect cooling device. The method and the cooling system are used for cooling the color painted steel strip in the hot state during continuous automatic production of color painted steel strips, can obviously strengthen the ply adhesion between a bottom coating and a surface coating of the color painted steel strip, overcome the defects of a paint film such as hole shrinkage, air bubbles and whitening caused by secondary pollution, reduce the amount of the deionized cooling water and the production cost, save water resources, and protect the environment.
Description
Technical field
The present invention relates to cooling means and cooling system behind a kind of baking colorful coated steel plate paint film.
Background technology
Color painted steel strip and steel band continuous and automatic production line technical process are summarized as follows: and uncoiling → cleaning by degreasing → change is coated with → dries → primary coat/back of the body is coated with → toasts → and the I → face that cools off is coated with/carries on the back and be coated with → toast → cool off II → check → rolling.
The factor of coating physical and chemical performance and surface quality that influences is except the quality of coating own, and construction technology has material impact to product quality.According to the relevent statistics, produce in the influence factor of paint film disadvantage such as shrinkage cavity, bubble etc., account for 48.3% because of what coating variety and quality caused, account for 34.1% because of what execution conditions and construction technology caused.In the construction technology, except the allotment of pre-treatment process, coating, baking temperature arrange etc. film performance and apparent bringing the direct influence, select the correct type of cooling (air-cooled, water-cooled) to coating adhesion, coating durability and eliminate pin hole, bubble, loose colour (turning white) to be of great significance in coating baking back.
At present, the type of cooling that generally adopts after the coating baking is the air-cooled shower water cooling (with reference to figure 1) that adds.And in the prior art, the shower water cooling all is to adopt the mode that goes up the lower nozzle spray, and there is following defective (especially for primary coat baking back cooling) in this mode:
1. the steel plate of priming after (or the end back of the body be coated with) is about 210～232 ℃ in baker exit plate temperature, after cold wind blows spray, the plate temperature can be descended 30～40 ℃, be that the plate temperature can be down to 180～200 ℃, no matter which kind of type coatings priming paint belongs to, under this temperature, contact with the globule, all can produce local surface tension and change, and then the influence surface coating's adhesion;
2. cooling water adopts deionized water (desalted water) and recycles, new system deionized water electrical conductivity is generally less than 20 μ s/cm, produce (about output 2000T) through a week approximately, cooling water electrical conductivity in the circulating water pool raises rapidly, can reach more than the 300 μ s/cm under the serious situation, even replenish new deionized water by 1～2T/hr, also can't improve the situation that water quality is polluted rapidly.Pollution sources (cation) are mainly from aspects such as pipeline, steel plate, equipment and environment; The another kind of pollution is greasy dirt and microorganism, and greasy dirt mainly comes from the kinetic pump in the circulating water pool, and microorganism is mainly from circulating water pool self.When the hot steel plate behind the shop primer cools off under contaminated water quality, cause following consequence: 1. salt is residual on the priming coat.After covering finish paint, the combination of coating molecule is loosened between layer and the layer.When such product in outdoor application, be subjected to that the sun tans by the sun, moisture attacks because the existence of salt layer produces osmotic pressure, under the effect of inside and outside osmotic pressure, film rapid bubbling and destroy, thereby shorten product service life; 2. exist greasy dirt or microorganism residual on the priming coat, local tension force changes.When being coated with finish paint, pollution place easily produces disadvantages such as shrinkage cavity, bubble, thereby has a strong impact on product quality.
Summary of the invention
The objective of the invention is: the cooling means behind a kind of baking colorful coated steel plate paint film is provided, be applied in color painted steel strip and the steel band continuous automatic production process cooling to the steel band of filming under the hot state, can significantly strengthen the ply adhesion between coated steel sheet priming coat and the finishing coat, and eliminate by secondary pollution cause such as shrinkage cavity, bubble, paint film disadvantage such as laugh.And, reduced the use amount of deionization cooling water, reduce production cost, conserve water resource, protection environment.
Another object of the present invention is: the cooling system behind a kind of baking colorful coated steel plate paint film is provided, be applied in color painted steel strip and the steel band continuous automatic production process cooling to the steel band of filming under the hot state, can significantly strengthen the ply adhesion between coated steel sheet priming coat and the finishing coat, and eliminate by secondary pollution cause such as shrinkage cavity, bubble, paint film disadvantage such as laugh.And, reduced the use amount of deionization cooling water, reduce production cost, conserve water resource, protection environment.
The technical scheme of cooling means of the present invention is: the cooling means behind a kind of baking colorful coated steel plate paint film, coated steel sheet after the baking of filming is being carried out in the water quench process, only the coated steel sheet back layer contacts with cooling water, and the coated steel sheet positive layer does not contact with cooling water.
The positive layer of same coated steel sheet and back layer have a great difference (condition of exposing to the sun and rain outside positive layer faced chamber harshness because of environment for use in the future, relatively stable in the back layer faced chamber), so it is very high that the film quality of coated steel sheet positive layer requires, and the back layer quality requirement is relatively low.
Thereby, press when lower nozzle two sides spraying cooling water is cooled off on the prior art, if guarantee the film quality of positive layer, then cooling water must be exigent pollution-free deionized water, so need expend a large amount of deionized waters, and because cooling water is recycling aborning, the cooling water quality has individual change procedure, as long as it is untimely to change the deionization cooling water, will influence product quality.
The present invention is by changing the type of cooling, the coated steel sheet positive layer does not contact with cooling water, thereby the priming coat on coated steel sheet surface just can not contact with cooling water in cooling procedure yet, so, avoid priming coat contaminated on the one hand, also reduced the requirement to the cooling water quality; Avoid priming coat at high temperature to contact with the globule on the other hand, avoid its local surface tension to change, and then the influence surface coating's adhesion.So, can improve product quality, increase the service life.
Simultaneously, because cooling water only contacts with the coated steel sheet back layer, even the cooling water of slight pollution is arranged, as long as face does not produce water spots when being coated with cooling, can also continue to use, and not need the very high pollution-free deionized water of service property (quality), save water resource thus greatly.Can find out in the embodiment introduction from behind, adopt the original type of cooling, the color steel of about every production 2000～2500T (hourly output 13.5T per hour replenishes deionized water 1.5T) namely must all be changed the cooling water in the pond.Adopt the type of cooling of the present invention, can extend to the service life of cooling water and produce the above color steel of 7500T at least and needn't change.
The technical scheme of cooling system of the present invention is: the cooling system behind a kind of baking colorful coated steel plate paint film, it comprises one to the cool water shower unit that cools off of coated steel sheet spraying cooling water after the baking of filming, and described cool water shower unit only is provided with when carrying out the coated steel sheet cooling work to coated steel sheet back layer spraying cooling water and can be to the spray outlet pipe of coated steel sheet positive layer spraying cooling water.
The cooling water that described spray outlet pipe sprays out can not touch the coated steel sheet positive layer.
Described spray outlet pipe is arranged at the below of the coated steel sheet in the production run.
The water curtain width that described spray outlet pipe constitutes should be wide less than the plate of coated steel sheet, is sprayed onto the positive layer of coated steel sheet to avoid water.
Porch, described cool water shower unit is provided with abat-vent.
Top, described cool water shower unit is provided with extractor fan.Starting extractor fan can drain steam, prevents from dripping to the plate face after the water smoke condensation.
Cooling system also comprises supporting roller water indirect cooling device.
Described supporting roller water indirect cooling device comprises carrying roller, and the water-supporting disc that fills cooling water, described carrying roller upper support coated steel sheet, and the carrying roller bottom is immersed in the water of water-supporting disc.The effect one of carrying roller has been the backing roll effect, the 2nd, and by rotating band water, carrying roller is unpowered, and the frictional force when rotation moves by steel plate drives.Carrying roller immerses in the water, cooling water is brought to the clad plate back side contact, and plays the effect of indirect cooling clad plate.
Described carrying roller is two.
Advantage of the present invention is:
1. cooling means and the cooling system behind the baking colorful coated steel plate paint film of the present invention, be applied in color painted steel strip and the steel band continuous automatic production process cooling to the steel band of filming under the hot state, can significantly strengthen the ply adhesion between coated steel sheet priming coat and the finishing coat, and eliminate by secondary pollution cause such as shrinkage cavity, bubble, paint film disadvantage such as laugh.
2. cooling means and the cooling system behind the baking colorful coated steel plate paint film of the present invention significantly reduced the use amount of deionization cooling water, significantly reduced the abraum salt acid that produces because of the water treatment facilities resin regeneration, the discharge capacity of spent caustic; Both produce good economic benefit, again aspects such as conserve water resource, protection environment had been produced good social benefit.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples:
Fig. 1 is the prior art constructions schematic diagram.
Fig. 2 is the structural representation of cooling system of the present invention.
Fig. 3 is the generalized section of supporting roller water indirect cooling device of the present invention.
Wherein: 1 cooling blower; 2 waste discharge fan shrouds; 3 abat-vents; 4 spray outlet pipes; 5 extractor fans; 6 water-supporting discs; 7 carrying rollers; 8 centering wiping arrangements; 9 purging motors; 10 coated steel sheets; 11 spray outlet pipe up and down; 12 carrying rollers.
The specific embodiment
Embodiment one:
Cooling means behind a kind of baking colorful coated steel plate paint film is being carried out in the water quench process the coated steel sheet 10 after the baking of filming, and only coated steel sheet 10 back layer contact with cooling water, and coated steel sheet 10 positive layers do not contact with cooling water.
Embodiment two:
As shown in Figure 2, cooling system behind a kind of baking colorful coated steel plate paint film is disposed with cooling blower 1, abat-vent 3, cool water shower unit, supporting roller water indirect cooling device, centering wiping arrangement 8, purging motor 9 along the production line process of coated steel sheet.
Coated steel sheet 10 is from the output of stove exit place, and is air-cooled through cooling blower 1, generally presses the color coating line of 13.5T/hr output design, and air output is generally 150～300m herein
3/ hr, after air-cooled, the plate temperature can reduce by 30～40 ℃.
Then, coated steel sheet 10 enters the cool water shower unit and carries out water-cooled, the spray outlet pipe 4 of cool water shower unit is arranged at the below of the coated steel sheet 10 in the production run, to coated steel sheet 10 cooling works the time, spray outlet pipe 4 only to coated steel sheet 10 back layer spraying cooling water, and can be to coated steel sheet 10 positive layer spraying cooling water.And, be sprayed onto the positive layer of coated steel sheet 10 in order further to avoid water, can set a plurality of outlet pipe groups, according to the difference of coated steel sheet 10 substrate width specifications, select suitable outlet pipe group, make that the water curtain width is wide less than plate.According to the steel plate quantity of the cooling of needs per hour, to open the water pipe group of respective numbers and also regulate hydraulic pressure, hydraulic pressure is advisable at 0.2～1.0Mpa.
Porch, cool water shower unit is provided with abat-vent 3.
Top, cool water shower unit is provided with extractor fan 5, and starting extractor fan 5 can drain steam, prevents from dripping to the plate face after the water smoke condensation.
As Fig. 2, shown in Figure 3, supporting roller water indirect cooling device comprises two carrying rollers 7 (steel rider) and water-supporting disc 6.The effect one of carrying roller 7 has been backing roll effects, the 2nd, and by rotating band water.Carrying roller 7 is unpowered, and the frictional force when rotation moves by steel plate 10 drives.Carrying roller 7 immerses in the water, cooling water is brought to coated steel sheet 10 back sides contact, and plays the effect of indirect cooling coated steel sheet 10, according to water temperature in the water-supporting disc 6, quantitatively replenishes deionized water.When producing thin specification color steel, the cool water shower unit can be closed, rely on indirect cooling can reach requirement.
Centering wiping arrangement 8 is used for preventing that coated steel sheet 10 from wandering off, and can squeezes coated steel sheet 10 plate face residual moistures.
Purging motor 9 is used for further drying up moisture, can suitably blow the hot blast of uniform temperature when needing.
In the present embodiment, cooling blower 1, abat-vent 3, extractor fan 5, centering wiping arrangement 8, purging motor 9 all can adopt the equipment of prior art.
Embodiment three:
Present embodiment is the application examples of embodiment one cooling means, embodiment two cooling systems.
Certain company, one of 100,000 tons of color painted steel strip automatic production line of newly-built annual output, 65 meters/minute of line speeds, the equipment preparation is arranged by the standard technology requirement, has 20m
3/ hr pure water device one cover, each one in circulating water pool and transfer pond, gross reservoir capacity 400m
3
Reverse pair of roller coat adopted in the steel plate application, and epoxy primer adds the polyester finish paint, singly is coated with or two back side lacquer that is coated with.
The type of cooling after the former design priming paint baking is the air-cooled mist cold-peace water-cooled that adds.Recording new system deionized water electrical conductivity is 20 μ s/cm.Produce (about 650 tons of output) after 48 hours, recording the cooling water electrical conductivity is 100～200 μ s/cm, produce (about 2000 tons of output) after 144 hours, recording the cooling water electrical conductivity is that 300 μ s/cm are above (in the production process, per hour replenish 1.5 tons of new system deionized waters), illustrate that cooling water is contaminated, contain more high in salt, this salt directly acts on the priming coat surface and participates in cooling, salt will remain in the priming paint surface, cause between priming coat and the finishing coat adhesion to descend, and easily produce disadvantages such as shrinkage cavity, bubble, directly influence colored steel service life.
Use this patent method cooling device is transformed, i.e. the air-cooled indirect water-cooling that adds can produce continuously that color steel side need change whole cooling waters more than 7500 tons.By producing 100000 tons of color steels per year, change cooling water 400m at every turn
3Calculate, but using water wisely whole year 14600m
3, and significantly reduced the abraum salt acid that produces because of the water treatment facilities resin regeneration, the discharge capacity of spent caustic.This patent has not only improved product quality, has produced good economic benefit, and aspects such as conserve water resource, protection environment have been produced good social benefit.
Should be pointed out that for the present invention through proving absolutely also to have the embodiment of multiple conversion and remodeling, be not limited to the specific embodiment of above-mentioned embodiment.Above-described embodiment is as just explanation of the present invention, rather than limitation of the present invention.In a word, protection scope of the present invention should comprise those apparent conversion or alternative and remodeling to those skilled in the art.
Claims (4)
1. the cooling system behind the baking colorful coated steel plate paint film, it comprises one to the cool water shower unit that cools off of coated steel sheet (10) spraying cooling water after the baking of filming, and it is characterized in that: described cool water shower unit only is provided with when carrying out coated steel sheet (10) cooling work to coated steel sheet (10) back layer spraying cooling water and can be to the spray outlet pipe (4) of coated steel sheet (10) positive layer spraying cooling water;
Described spray outlet pipe (4) is arranged at the below of the coated steel sheet (10) in the production run;
The water curtain width that described spray outlet pipe (4) constitutes should be wide less than the plate of coated steel sheet (10);
Cooling system also comprises supporting roller water indirect cooling device;
Described supporting roller water indirect cooling device comprises carrying roller (7), and the water-supporting disc (6) that fills cooling water, described carrying roller (7) upper support coated steel sheet (10), and carrying roller (7) bottom is immersed in the water of water-supporting disc (6).
2. the cooling system behind the baking colorful coated steel plate paint film according to claim 1, it is characterized in that: porch, described cool water shower unit is provided with abat-vent (3).
3. the cooling system behind the baking colorful coated steel plate paint film according to claim 1 is characterized in that: be provided with extractor fan (5) above the described cool water shower unit.
4. the cooling system behind the baking colorful coated steel plate paint film according to claim 1, it is characterized in that: described carrying roller (7) is two.
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| CN200810156836.5A CN101462105B (en) | 2008-09-27 | 2008-09-27 | Cooling method and cooling system after baking colorful coated steel plate paint film |
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| CN200810156836.5A CN101462105B (en) | 2008-09-27 | 2008-09-27 | Cooling method and cooling system after baking colorful coated steel plate paint film |
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| CN101462105B true CN101462105B (en) | 2013-09-11 |
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| CN103203310A (en) * | 2013-03-28 | 2013-07-17 | 鞍钢股份有限公司 | Method for producing back plate of liquid crystal television |
| CN103909053B (en) * | 2014-04-22 | 2015-07-15 | 成都彩星科技实业有限公司 | Painted plate cooling tool |
| CN111842525A (en) * | 2020-07-15 | 2020-10-30 | 林雪 | Soak formula aluminium alloy and cool off conveyor fast |
| CN114083872B (en) * | 2021-11-17 | 2024-03-08 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Cooling method for stainless steel vibration reduction plate |
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| CN201030349Y (en) * | 2007-04-27 | 2008-03-05 | 郝国臣 | Energy-saving chromatic clad steel plate production facility |
| CN101253010A (en) * | 2005-09-27 | 2008-08-27 | 杰富意钢铁株式会社 | Cooling facility and production method of steel plate |
| JP4145606B2 (en) * | 2002-08-23 | 2008-09-03 | 住友金属工業株式会社 | Steel plate lower surface cooling device, steel plate and method for producing the same |
| CN201366406Y (en) * | 2008-09-27 | 2009-12-23 | 苏州扬子江新型材料有限公司 | Cooling system for color coating steel plates after film coating baking |
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2008
- 2008-09-27 CN CN200810156836.5A patent/CN101462105B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1048571A (en) * | 1989-07-05 | 1991-01-16 | 青州铝箔纸总厂 | A kind of moisture regain method and apparatus of vacuum aluminium-plated paper |
| CN2254073Y (en) * | 1996-05-17 | 1997-05-14 | 任建国 | High-temp. material scale conveyer |
| WO2003086683A1 (en) * | 2002-04-12 | 2003-10-23 | Castrip, Llc | Casting steel strip |
| JP4145606B2 (en) * | 2002-08-23 | 2008-09-03 | 住友金属工業株式会社 | Steel plate lower surface cooling device, steel plate and method for producing the same |
| CN101253010A (en) * | 2005-09-27 | 2008-08-27 | 杰富意钢铁株式会社 | Cooling facility and production method of steel plate |
| CN200954522Y (en) * | 2006-10-08 | 2007-10-03 | 南京钢铁股份有限公司 | Limina-cooling-water side spraying blow-sweeping system for use after rolling high-strength low alloy steel |
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