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Electrocoating Tecnology

Electrocoating Process

Thanks to the voltage difference at the anode (the end), the negatively charged lacquer particles, will be deposited ONLY on areas where the metal is in contact with the lacquer fully covering any scra- tches on the inside or outside of the end, on the curled cut edge, the score line, the smile beads, rivet area and tab cut edge.

This is the most technologically advanced method for protecting metals by applying a coating.

Electrophoresis steps:

DIPPING:

The ends are dipped into a bath containing a coating solution that deposits immedia-tely on exposed metal such as cut edges, scratches and other blemishes and forms a moist film.

The electrophoretic bath is prepared by diluting lacquer in deionised water. Because it is a dipping process, complex-shaped objects can be uniformly coated.

WASHING:

After the bath, the ends still have solution droplets adhering to them and so they are cleaned up with blasts of air

and water, that which do not damage the coated parts.

DRYING:

As there is a very low quantity of solvent, drying is problem-free; the ends will be perfectly coated with no blemishes

left by the productive process.

Electrocoater consists of the following sections:

INFEED SECTION:

It consists of infeed downstackers (one per line) with their driving devi- ces.

The downstackers are equipped with magnetic end separators that receive the ends coming from the conversion press.

Technical data:

END TYPE:

Round or shaped easy open ends.

ELECTROCOATING BATH SECTION:

Here the ends are dipped into the lacquer solution where full coverage of any scratch in just one transit is achieved by applying a contact to the end.

RINSING/BLOWING SECTION:

This section includes batteries of fans and air knives set to clean the ends before the lacquer is dried in the oven.

CURING OVEN:

The ends are carried through the different oven zones (pre-heating-cu-ring-cooling) by means of chains equipped with special plastic pockets suitable for high temperature work. Curing times are preset to achieve perfect lacquer polymerisation.

At the exit of the oven, the ends are taken by a magnetic belt conveyor that provide to carry them to the outfeed of the machine.

Compact Electrocoater

 

Description:

The new design of our machines meets and beats all other types of machines offered on the market.

We also achieved better performances giving more immersion time, checking the process end by end, reducing bath foaming and solution waste, reducing cleaning and maintenance downtimes.

The total accessibility of any parts makes this machine “user-friendly” for the operator.

 

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ADVANRAGES

ECOAT TECHNOLOGY VS SPRAY SYSTEM
1. In one passage it is possible to lacquer repair all the damaged parts (inside and outside) 1. Only repairs score area.
2. The lacquer distribution is very uniform and thin and cannot be damaged during the seaming operation. 2. If the lacquer is not uniformly applied it is possible to have lacquer build-up and cracks during seaming operation.
3. No sticky problems 3. Sometimes uncured spray lacquer causes sticky problems. The ends stick together.
4. Very flexible machine - the machine can be tooled with one lane with a round size and the other lane with a rectangular or shaped size - without expensive changes. 4. Dedicated machine required for changing from round to non-round sizes.
5. Very high speed machine - it is possible to achieve a very high speed up to 600 e.p.m. or more because there are no rotating guns to apply lacquer. 5. It is very difficult to achieve high speed. Big risk of machine parts breaking - difficult to achieve good lacquer distribution.
6. No bridge effect - in the electrocoating process the lacquer is uniformly applied along the score, even if it has a very sharp angle. 6. If the lacquer has a high viscosity and the score has a sharp angle lacquer doesn’t penetrate inside.
7. Very low lacquer consumption and no overspray problem – the lacquer is applied on all uncovered parts of the end. 7. High lacquer consumption with a lot of overspray. Lacquer is applied only in the score area. Spray systems consume 8 times more lacquer than electrocoaters.
8. Possible to adjust the lacquer deposition by adjusting the lacquer concentration in the bath and the voltage. 8. Very difficult to make precise lacquer adjustment.
9. Environment- friendly technology - the process uses water-based (deionized water) lacquer solution with a concentration of 0.5 to 2 %. The lacquer is BPA-free. 9. The lacquer used has a high solvent content which is a problem for the operators and also for VOC emissions. Many companies are compelled to install thermal incinerators in order to comply with VOC regulations.
10. Very safe process we operate with water- based lacquer and not solvent. Explosion risk eliminated. 10. Due to the high content of solvent in the lacquer there is a high risk of oven explosion.
11. No special insurance required because of water base lacquer. You can store the electrocoater lacquer without fire hazard problems. 11. High insurance costs for the machine to cover accident risk for the operators in case of oven explosion. Insurance costs for lacquers stored in the warehouse.
12. Cost reduction due to the possibility to use the tin free steel or tinplate coil coated material for tab, instead of the zinc-coated coil. 12.It is necessary to use zinc-coated coil in order to prevent some oxidation in the raw edges of the tab
MAJOR ADVANTAGES:

ALL OVER LACQUER REPAIR - NO VOC - LESS DOWNTIME - 30% SAVING ON WATER AND LACQUER - INCREASED REPAIR QUALITY DUE TO NEW CONTACT SYSTEM

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