|
1. KINDS OF PAINTIG SYSTEM
|
1) ELECTRO-DEPOSITION
2) CHEMICAL DEPOSITION (A.C.C.)
3) ELECTROSTATIC COATING
4) DIPPING COATING
5) POWDER COATING
6) LIQUID SPRAY COATING |
ELECTRO-DEPOSITION
CHEMICAL DEPOSITION: A.C.C
ELECTROSTATIC COATING
DIPPING COATING
POWDER COATING
LIQUID SPRAY COATING |
|
2. INTRODUCTION OF IMPORTANT EQUIPMENTS
|
1) PRETREATMENT |
IT IS A SERIES OF PROCESSES FOR THE REMOVING OF ALIENS
FROM THE SURFACE OF THE WORKPIECES, COMPOSED OF DEGREASING, RINSING,
SURFACE-CONDITIONING, PHOSPHATING AND RINSING BEFORE THE PAINTING
PROCESS. AFTER ELIMINATING ALL OF THE OIL ,DUST AND OTHER IMPURITIES.
THE WORKPIECES ARE PASSES THROUGH THE PROCESSES OF SURFACE-CONDITIONING
AND PHOSPHATING WHAT MEANS TO COAT WITH PHOSPHORIC LAYER TO IMPROVE
THE ANTI-CORROSION AND THE ADHERENCE OF THE PAINT FILM.
TYPE
: SPRAY TYPE / SPRAY AND DIP TYPE / FULL IMMERSION TYPE |
 
|
|
2) ELECTRO- DEPOSITION SYSTEM |
WHEN DIRECT CURRENT ELECTRIC ENERGY WAS CHARGED BETWEEN
THE ELECTRODES AND WORKPIECES, AFTER IMMERSED IN THE WATER-BORNE PAINT,
IT PRODUCES THE PAINT DEPOSITION ON THE SURFACE OF WORKPIECES. THE
EXCELLENT PAINT PERMEATION MAKES EASY TO COAT INSIDE OF THE COMPLICATED
ITEMS. THIS METHOD HAS MUCH OF ADVANTAGES OF GOOD QUALITY OF PAINT
FILM WITH UNIQUE PAINT FILM THICKNESS, GOOD TRANSFER EFFICIENCY OVER
95%, WHICH SAVES THE PAINTING COST TOGETHER WITH SYSTEM AUTOMATION,
AND THE DECREASE OF THE FIRE RISK AS WELL AS THE REDUCTION OF THE
AIR POLLUTION ALSO.
ADVANTAGES
UNIQUE COATING FILM THICKNESS.
FREE FROM PIN-HOLE AND FORMING.
LOWER BAKING TEMPERATURE.
LOWER OPERATING COST .
POSSIBILE OF FULL ATOMIZATION.
NO POLLUTION BY SOLVENT
SAFE FROM FIRE .
TRANSFER EFFICIENCY OVER 95%.
HIGH PERMEATION / HIGH ANTICORROSION.
DISADVANTAGES
HIGH CONSTRUCTION COST.
DIFFICULT TO CHANGE COLOUR.
DIFFICULT TO MANAGE COATING LIQUID. |
 
|
|
3) CHEMICAL DEPOSITION (A.C.C.) |
A AUTO-DEPOSITION SYSTEM OF WATERBORNE PROCESS WHICH
DEPENDS ON CHEMICAL REACTIONS TO ACHIEVE DEPOSITION. THIS PROCESS
HAS BEEN IN COMMERCIAL USE SINCE 1975. PRESENTLY, THERE ARE NUMEROUS
INSTALLATIONS IN OPERATION, COATING A VARIETY OF FABRICATED STEEL
PARTS FOR THE AUTOMOTIVE AND GENERAL INDUSTRY MARKETS. WITHOUT CHARGING
OF ELECTRICAL ENERGY , IN THE BATH OF MILDLY ACIDIC LATEX EMULSION
POLYMER, THE LIBERATED IRON IONS INTERACT CHEMICALLY WITH THE LATEX
IN SOLUTION CAUSING COATING DEPOSITION ON THE SURFACE OF THE STEEL
PARTS. A UNIQUE FEATURE OF THE AUTODEPOSITION PROCESS IS THE FORMATION
OF A VERY UNIFORM FILM OVER THE ENTIRE SURFACE OF THE WORKPIECE, EVEN
IN DIFFICULT-TO-REACH AREAS. UNLIKE COATING PROCESSES THAT REQUIRE
A CHARGE TO DEPOSIT THE COATING (I.E.,WHERE ELECTRICAL ENERGY IS REQUIRED
TO "THROW"THE COATING INTO RECESSED AREAS) AUTODEPOSITION WILL COAT
TUBULAR, ASSEMBLED,OR INTRICATE-DESIGN AREAS UNIFORMLY.
ADVANTAGES
BIG SIZE WORKPIECE.
STEEL PARTS ASSEMBLED WITH RUBBER OR PLASTICS.
HIGHER SURFACE HARDNESS.
FOR COMPLICATED SHAPE WORKPIECE.
UNIFORM COATING FILM.
HIGHER PRODUCT EFFICIENCY BY AUTOMATIC CONTINUOUS OPERATION
HARMLESS TO ENVIRONMENT WITHOUT VOLATILE SOLVENT.
LOWER COST IN OPERATION AND MAINTENANCE
LOWER BAKING TEMPERATURE.
DISADVANTAGES
ONLY IN BLACK COLOUR.
NEEDS OF COMPLETE REMOVING OF IMPURITIES.
|
4) POWDER COATING |
| ADVANTAGES
EASY TO USE.
NO LOSS OF COATING MATERIAL.
REPAINTABLE BEFORE BAKING.
ABLE TO COAT THICKLY.
NO ENVIRONMENTAL CONTAMINATION.
NO NEED FOR SKILLFULNESS OF WORKER.
NO NEED FOR EXHAUST SYSTEM FOR SOLVENT GAS.
DISADVANTAGES
HIGH CONSTRUCTION COST.
DIFFICULT TO COAT THINLY.
DIFFICULT TO MIX COLOUR.
DIFFICULT TO CHANGE COLOUR.
LOWER WORK EFFICIENCY.
|
5) LIQUID PAINT SPRAY BOOTH |
| WE HAVE TWO TYPES ; DRY TYPE AND WET TYPE BOOTH. THE
PAINT SPRAY IS VERY HARMFUL TO WORKER AND DANGEROUS FOR EXPLOSION
AND CATCHING FIRE. SO, THE BOOTH SHOULD BE EQUIPPED WITH AIR SUPPLY
AND EXHAUST SYSTEM AND IN THE SPRAY BOOTH OF WET TYPE, THE OVERSPRAYED
PAINT MIST SHOULD BE CAUGHT THROUGH THE FLOOR TYPE OR WALL TYPE HYDROSPIN
SYSTEM AND SENT TO SLUDGE POOL IN STATE OF MIXED WITH THE CIRCULATION
WATER IN THE SYSTEM. THE EXHAUSTED AIR FROM THE BOOTH IS SENT TO PASS
THROUGH THE ACTIVE CARBON TOWER TO ELIMINATE THE VOLATILE SOLVENT
OF GAS STATE.
SPECIAL FEATURE OF WET TYPE BOOTH.
HIGH CONSTRUCTION COST.
SUITABLE FOR MASS PRODUCTION.
NEED OF WASTE WATER TREATMENT.
HIGH MIST COLLECTION.
SPECIAL FEATURE OF DRY TYPE BOOTH.
LOWER CONSTRUCTION COST.
BETTER FOR SMALL PRODUCTION VOLUME.
NO WASTE WATER.
HIGH MIST COLLECTION.
|
 
|
|
6) OVEN |
DRY-OFF TYPE OVEN IS USED FOR EVAPORATING OF WATER CONTENT
AFTER PRETREATMENT PROCESS AND THE BAKING OVEN IS USED FOR BAKING
THE COATED FILM ON THE SURFACE OF THE WORKPIECES AFTER PAINTING. ACCORDING
TO THE CHARACTERISTICS OF THE PAINT AND THE CONDITION OF THE ENERGY
SOURCE, THE HEAT SOURCE,THE METHOD OF HEAT EXCHANGE, HEATING TEMPERATURE
AND TIME SHOULD BE DECIDED.
KINDS OF OVEN SYSTEM
DRY-OFF OVEN
BAKING OVEN
INDUSTRIAL DRYER
CLASSFICATION BY ENERGY SOURCE
DIRECT & INDIRECT GAS OVEN
INDRECT HEATING BY LIGHT OIL BURNER
STEAM OVEN
ELECTRIC INFRARED OVEN
|
|
|
7) CONVEYOR |
FOR THE NEED OF EACH PROCESS THAT COMPOSES THE PAINTING
LINE, THE CONVEYER SYSTEM TRANSPORTS THE WORKPIECES CONTINUOUSLY TO
SUIT THE LINE PROCESS. THE CONVEYER TYPE , LENTH OF LINE, PULLING
POWER AS WELL AS THE SPEED AND THE HANGER PITCH SHOULD BE DECIDED
AFTER TECHNICAL CONSIDERATION OF THE DIMENSION OF THE WORKPIECES,
WEIGHT, PRODUCTION VOLUME , PAINTING METHODS AND ETC.
TYPES
OF CONVEYER
TROLLEY CONVEYER
FLOOR CONVEYER
POWER & FREE CONVEYER
BELT CONVEYER
CHAIN CONVEYER
AUTO LOAD & UNLOAD SYSTEM |
 
|
Click to enlarge image
Related Keywords:
Bookmark / Share this page