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Metallurgy
Steel Strip Processing Lines
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Color Coating Line

Color coating line(Abr. CCL) is a production, which includes process of degreasing, phosphate, passivation, and continuous roller coating on strip surface with multi-layer coating(such SMP, HDP, PVDF,etc.) for new type functional strip. CCL is composed with Pay-off reel, sticher(welder), storage, degreasing section, roller-type coater, curing oven, shear and re-coiler,.etc.

I.        Equipment parameters:

1.       Incoming material: zince electroplating, hot-dip galvanizing, hot-dip galvalume, cold rolling plate.

2.       Strip width: 600~1500 mm

3.       Strip thickness: 0.15~1.5mm

4.       OD: φ800~2000mm

5.       Process speed: 25~150m/min

6.       Coating thickness : Dry layer top surface thickness 5~25μm
Dry layer bottom surface thickness 5~15μm

7.       Production: 50,000~200,000 tpy

8.       Energy: Power, natural gas, LPG, coal gas, steam, compressed air and etc.

II.       Equipment character:

1.       Advanced continuous coating process, two coating and two baking for up and down side, with reliable techniques, widely used in metallic workshops, municipal structure and high – end civil buildings.

2.       The pretreatment section uses continuous alkali spray, alkali brushing and three stage water spray, and last stage set fresh water spray to enhance the degreasing effect, ensure the cleanness and the quality of the product.

3.       To strengthen the adhesion of the paint, we use non chrome chemical coating technology, with chemical agent cycling and agitating system, the chemical film and coater could form in high quality and performance. This process also has features of environmental friendly, high utilization, and high adhesion.

4.       The coater was equipped with pressure sensor to display and control the uniformity of the coat, using vector motor variable frequency speed adjustment for forward or backward coating, could control the thickness of the coat layer into one μm, to adjust the requirement of different products.

5.       The baking furnace uses multiple stage labyrinth board structure with high heat preservation, and has several hot air cycling devices, fresh air filling system, waste gas emission, automatic temperature control and other functions, equipped with incinerate and complete heat recovery devices, reached national emission standard, saving energy and lower the cost of the production.

6.       The control system has ACFCVM, CPC and EPC, on site bus and etc, with nice user interface and stable equipments.

7.       New concept of intelligence production and power management system, configured with frequency control fan for lowering energy consumption.

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Eletrolytic Tinning Line

Strip Electro Tinning(Electro-Chromism) Line is to use sulphate(chromic anhydride) electroplating to electrolyte tin(chromium/chromium hemitrioxide) and sediment on strip, and form an intensive coating. ETL is composed by Pay-off reel, welder, storage, electrolytic degreasing cleaning section, plating tank, reflowing equipment, electrolytic passivation, oiler, shear, and re-coiler.,etc.

I.       Equipment parameters

1.       Incoming material: Annealed cold rolled strip

2.       Strip width: 600~1050mm

3.       Strip Thickness: 0.15~0.55mm

4.       OD  φ800~1800mm

5.       Process speed: 100-450m/min

6.       Coating layer thickness: single side to   0.38~1.5µm

Single side specific tinning amount---- 1.1~11.2g/㎡

Single side specific chroming amount---- 45~100mg/㎡

7.       Production: 50,000-500,000 tpy

8.       Energy: Power, Nature gas, LPG, Coal gas, Steam, Compressed air.

II.       Equipment characters:

1.       Vertical tank for degreasing section, pickling section and electroplating section for saving space.

2.       Acid sulfate electroplate process is used to clean strip surface oxide and make strip surface activation. High production rate and low requirement of corrosion resistance.

3.       Electrolytic passivation improves the corrosion resistance of tinned strip and the adhesion with coating when it is coated.

4.       Induction and resistance reflow improve the cladding material adhesion with strip to form an alloying film.

5.       Coating film thickness detector can monitor and feedback cladding material actual thickness to guide plating current.

6.       The control system consists of vector motor for Variable frequency speed control, field bus and fiber bus for communication, real time parameter monitor, and other computer control system.

7.       On-line digital stroboscope can be installed according to custom requirement to check the cladding material.


Continuous Galvanizing Line

Continuous hot-dip Galvanizing( Galvalume ) Line is a complete set of equipment, that both strip surface is plated with a layer of zinc or zinc- aluminum alloy in high temperature mode. CGL is composed of Pay-off reel, welder, storage, degreasing cleaning section, annealing furnace, zinc pot, air knife, skin pass mill, leveler, oiler, shear, re-coiler, etc.

 I.         Equipment parameters
      1.        Incoming material: cold rolled carbon structure strip, quality carbon structure, and low alloy strip.

2.        Strip width: 600~1500 mm
      3.        Strip thickness: 0.15~3.5mm

4.        OD: φ800~2000mm

5.        Process speed:80~200mpm

6.        Energy: Power, Nature gas, LPG, coal gas, steam, compressed air, etc.

7.        Spangle types: normal, small, non-, skin pass-.

8.        Zinc layer thickness: 50~300g/m2(double sides)

9.        Post-treatment: skin pass, leveling, anti-figure coating/ passivation, oiling.

10:      Annealing furnace: Horizontal/Vertical/L shape

 II. Equipment features

1. Equipped with chemical degreasing section or electrolytic degreasing section, could choose horizontal spray or vertical soaping spray cleaning mode, we have unique electrolytic cleaning technique, could have more efficiency and avoid secondary pollution from the sink.

2. Using NOF and RTH combined technique, with high speed heating and high utility ratio, using special composite material with more precision, could improve the insulation and longevity of high temperature zone.

3. The cooling of the strip after annealing uses protection gas cycling spray cooling, with variable frequency speed adjustment control and high pressure high speed jet flow, the strip could be cooled fast and uniformity, and the temperature of the strip entering the zinc pot could also be controlled.

4. Tension leveler and skin pass were installed, the quality and surface of the strip could be improved, thus improve the coating and mechanical performance.

5. Using fume heat recovery technology, through fume – water heat transfer or steam pot heat recycle to heat the cleaning section liquid, improve the heat utility ratio and decrease the energy consumption.

6. Using jet style ceramic sensor heating zinc pot, with features of fast heating, even temperature, long longevity and less zinc slag, wet chlorine and cycling zinc pot device could improve the precision of the strip surface, meet the requirement of home appliance color coating plate.

7. Using coating thickness measuring instrument to monitor the thickness of the coating and guide the air knife.

8. Using fingerprint proof coater with fast shift device, could optimize the position of the equipment, reduce the investment of the workshop, and also get precision organic or composite coating on the surface.

9. The control system has ACFCVM, CPC and EPC, on site bus and etc, with good user interface and stable equipments.

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Degreasing Line

Electrolytic degreasing Cleaning Line (Abbr. as ECL )is a complete set of equipment, that strip passes alkali liquid , and with the function of exchangeable pole DC, strip is to be alternatively set as anode or cathode, and strip surface has gas evolution, which can make oil film emulsification and polarization and tear, and impel oil separate from strip surface for removing. ECL is composed of Pay-off reel, leveler, welder, shear, degreasing section, hot air dryer, cross cutting shear, and re-coiler, etc. 


Pickling Line

Continuous Pickling Line--- To connect strip and tail of two strips to pass pickling tank for continuous production. It has the character of high pickling efficiency , short time line stop, high production, easy control of in-tank tension, and low power consumption.

 Line character:

--- Flash welding or laser welding, to guarantee continuous production.

----Multi-cassette turbulence pickling and rinsing process. Maximum pickling efficiency, rinsing efficiency, and to save production cost.

----Automatic control pickling process. Realize automatic measure and control of liquid level, temperature, and conductivity.

----Equipped with high-precision rotary side trimmer. To guarantee trimming quality and reduce knife changing time.

----Use AC frequency control system. Automatic control of speed and tension.

 Push-pull Pickling Line (Abr. PPPL)--- Use non-continuous pickling process to separately pickle single strip with push-pull force, and so it is called. Comparing to continuous pickling line, PPPL is relatively simple structure, and easy for production operation and maintenance. PPPL is more flexible for various steel grades, and takes small area, which also means saving construction investment and operation cost, and short project construction period, and mostly suitable for medium and small amount cold rolling production.

 Line characters:

--- Non continuous pickling, and not equipped with welder and looper.

---Entry section equipped with multi-roller leveler, makes each coil smooth threading.

---Multi-cassette turbulence pickling and rinsing process. Maximum pickling efficiency, rinsing efficiency, and to save production cost.

----Automatic control pickling process. Realize automatic measure and control of liquid level, temperature, and conductivity.

----Equipped with high-precision rotary side trimmer. To guarantee trimming quality.

----Use AC frequency control system. Automatic control of speed and tension.

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 Laminating Line

Laminated Steel production line is used to produce composite material, which has the good qualities of both plastic film and metal strip, by press or glue multiple polyester composite films at high temperature to double sides of steel strip or chromate iron coil cleaned by degreasing process. The line consists of pay-off reel, stitcher, storage, degreasing machine, laminator, waste film shear, re-coiler, etc. 

I        Equipment parameters

       1.    Raw Material: Cold Rolled Coil, TFS Coil, etc.

  2.    Strip Width: 600~1050mm

  3.    Strip Thickness: 0.14-0.45mm

  4.    Coil OD: φ900~1700mm

  5.    Film Thickness: Single Side 12~30μm

  6.    Capacity: 30,000~100,000 tons per year

  7.    Energy: Electricity, Nature Gas, Steam, etc. 

II.     Equipment features

       1.    Advanced continuous hot pressing laminating technique, short process flow, advanced technology. Wide used in food package.

  2.    Degreasing section adopts vertical cleaning structure to achieve the effects of alkali liquid continuous circulating spraying, brushing, and multistep circulating spraying and brushing which will clean result to ensure the adhesion between strip surface and film that may influence the products quality.

  3.    Laminator is equipped with pressure and temperature sensor which accurately display hot pressure and temperature to achieve the precisely on-line control of temperature and pressure during laminating.

  4.    Tension and speed of laminator adopts precise servo control system which can meet the special technique of laminator film, and achieve the on-line continuous coil changing.

  5.    Laminator equipment is equipped with ultrahigh frequency induction heater, which will heat the strip fast and evenly, with multi-groups temperature detector to closed-loop control strip temperature.

  6.    There are several temperature, length, tension detecting points to guarantee products quality.

  7.    The control system consists of vector motor for Variable frequency speed control, field bus and fiber bus for communication, real time parameter monitor, and other computer control system.