Spray painting

Electrostatic Paint Spraying

Application of Electrostatics

Electrostatic Paint Spraying

• Paint droplets from an aerosol usually become charged by rubbing against the nozzle of the spray. • Car body is earthed, paint droplets will be attracted onto the metal body.

Application of Electrostatics

Electrostatic Paint Spraying

• Paint droplets repel each other and spread out more evenly.•Areas that are covered with charged paint would create repulsion to the fresh layer of sprayed paint drops allowing better dispersion of the paint coating.

Application of Electrostatics

Electrostatic Paint Spraying

•Adv:• Even coat of paint• Paint reaches inaccessible parts

Application of Electrostatics

ELECTROSTATIC SPRAY PAINTING

During car production, the unpainted car body and the paint are given opposite electric charges.

Unlike charges attract, so: › The paint sticks to

every corner of the car body

› The paint covers the car body evenly.

PHOTOCOPIERS AND INKJET PRINTERS

PHOTOCOPIER

This machine allows you to make copies of printed material.

Makes use of light, heat and static electricity.

Static Electricity in a Photocopier

(1) & (3) drum inside is charged. Light reflects an image of document on drum. Dark areas (writing and images on the original) retains a positive charge.

(4 & 5) Charged parts of the drum attracts the negatively-charged toner ink (black powdered particles).

(6) Toner ink transferred from drum to positively-charged paper, producing a copy of original.

And laser printers…

Inkjet Printers

Inkjet printers work by spraying charged drops of ink onto a page. The droplets can be directed using two oppositely charged plates. The voltage on these plates can be easily swapped or varied. The inkjet cartridge can also moved across the page by the printer .

MADE BY:

MUHAMMAD FAHD UN NABI KHANXI-0

USMAN PUBLIC SCHOOL