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ELECTROPHORETIC LACQUER COATING PLANT

INTRODUCTION
:
Applying organic coatings by Electrophoresis is well established and has been in commercial use for over 40 years.

Cathodic eletrocoats were introduced in the early 1970’s and were quickly adopted by the Automotive Industry due to the improved corrosion protection. This improved corrosion protection is mainly due to the lack of substance dissolution due to electrochemistry of the cathodic deposition process.

Cathodic eletrocoats thus become a viable process for coating components plated with BRASS and SILVER – not possible with anodic electrocoats.

Non-yellowing CLEAR cathodic electrocoats based on acrylic polymers were introduced into the electroplating industry in the early 1980’s. The very early installations were mainly for coating brass and silver plate, replacing spraying and dip lacquering. With the introduction of modern ultrafiltration systems and better polymer systems cathodic electrophorectic coatings have become a important part of the average electroplating shop, with industries such as lighting, plumbing hardware and a variety of other industries making electrocoating an integral part of their process.

Electrophoretic plants replace spraying or dipping with a more efficient process, taking out the skill factor of spraying and replacing solvent based systems with a more environmentally friendly and less hazardous process. Tinted versions of clear electrophorectic started to find a market share replacing cyanide brass plating in a number of cases with a similar looking effect on white metal plated substrates.

Also some installations were replacing electroplating completely by using tinted coatings direct onto base metals to produce replacements for existing electroplating processes.

Popular Applications: -
Costume Jewellery
Hardware
Bathroom Fittings
Light Fittings
Brass Handicrafts
Spectacle Frames etc.


A typical Electrophoretic Lacquer Plant would require the following:

 
CONSOLE OF TANK

Console of Tanks for convenient and compact usage. A console of 7 Tanks is used comprising Pre- Rinse and Post-Rinse Tanks together with the main Lacquer Tank. These Tanks are normally fabricated out of Polypropylene and are provided with Lids to ensure the dust free condition of the solution when not in use. A common drainage system is often provided.

   
   
A CARTRIDGE FILTER

A Cartridge Filter of 2 to 5 microns mesh size is recommended for filtration and removal of dust particles. This serves the dual purpose of Filtration as well as movement of the solution.

 
   
   
HOT AIR BLOWER UNIT

After the coating is completed on the pieces, they are required to be blow dried, which ensures removal of excess drops of Lacquer as well as increases the temperature of the articles before they are taken for Oven curing.

 
   
   
CURING OVEN

After blow-drying the coated pieces are required to be cured in an air circulatory oven. The articles are required to be cured at 160 Deg. C for 20 minutes. The pieces may be either loaded on the Trolleys for convenient handling or loaded in the Oven in any suitable manner.

   
   
RECTIFIER

This is a special Rectifier of capacity ranging up to 100 Volts and 20 Amps. The capacity required depends upon the number of pieces loaded in any batch. The Rectifier consists of ramping arrangement for gradual increases of the voltage, Digital Timer and Digital Meters. The Dimmerstat should be motorized with a Contactor arrangement.

   
   



 
ULTRA FILTER

An Ultra Filter Unit is required in this process for the removal of water-dissolved impurities from the bath. This Unit consists of a Membrane of suitable capacity, high-pressure Pump and inlet outlet pipes. The Unit is conveniently mounted on Angle Frame.

 
   
   
 
D.M WATER PLANT

A suitable capacity D.M. Water Plant is recommended so as to get water of less than 5 microsiemens.

 
   
   
CHILLER UNIT

Since this process works best at temperature around 25 Deg. C, a Chilling arrangement of suitable capacity is recommended.

 
INSTRUMENTS

a) pH Meter
b) Conductivity Meter
c) Refracto Meter
d) Magnetic Stirrer ( for Dye Lacquer Plant)

 

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