this is about types, purpose, and function of spray gun in automotive

1. GROUP 2

2. SPRAY GUN
A Spray gun breaks the liquid sealer, primer, paint, and so
on into a fine mist and forces it onto the surfaces of the
vehicle. It is the key component in a refinishing system. A
quality spray gun is a precision-engineered and
manufactured tool.
There are many spray gun types and sizes. Each is
specifically designed to perform certain task. Even though all
spray guns have common parts and components, each gun
type or size is suited only for a defined range of jobs.
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3. TYPES OF SPRAY GUN
• Air (Pneumatic) Spray gun
• Airless spray gun
• Air-assisted airless spray gun
• Electrostatic spray gun
• Pressure feeding air spray guns
• HVLP (High volume Low pressure) spray gun
• LVLP Spray Gun
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4. Air Pneumatic Spray gun
A pneumatic spray gun is a painting tool that
uses compressed air from a nozzle to
atomize a liquid into a controlled pattern.
Here are some specifications of a few
different pneumatic spray guns:
• Working pressure from 3 to 7 bars
• Can only be used with 310 ml cartridge of
sprayable sealer
• Light weight (1.1 kg)
• Easy to adjust
• Independent possibility of regulating the
spraying and the quantity of product

5. Pneumatic Spray Gun
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Pneumatic spray gun is to apply a smooth
and even coat of liquid onto a surface. The
compressed air supplied by an air
compressor atomizes the liquid into a fine
mist, which is then sprayed onto the surface
to be painted. Pneumatic spray guns are
commonly used in the automotive industry,
woodworking, and other industries where a
smooth and even finish is required. They are
also used in painting large surfaces, such as
walls and ceilings.

6. Airless Spray
Gun
A airless spray gun uses hydraulic
pressure rather than air pressure
to atomize paint material. With the
airless spray method, pressure is
applied directly to the paint, which
is ejected at a high speed through
small holes in the nozzle and
formed into a mist.

7. Air-Assisted Airless Spray
Gun
An air-assisted airless spray gun is a hybrid
between an air sprayer and an airless sprayer. It
uses a high-pressure fluid stream, like an airless
sprayer, and compressed air at the cap, like an air
sprayer, to produce a spray pattern similar to that
of an air sprayer and the speed and transfer
efficiency of an airless sprayer. Air-assisted airless
spray guns first partially atomize the fluid with a
special fluid nozzle tip similar to a standard airless
tip, and then complete the atomization with small
amounts of compressed air from the face and/or
the horns of the air nozzle that they use. It is used
to spray medium to high viscosity fluids and
delivers a finish quality that is better than airless,
but not as high quality as air spray.

8. Electrostatic Spray Gun
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Electrostatic spray gun the principle that
positive (+) and negative (-) Electrical
charges mutually attract each other but
oppose a like charge. Therefore, when paint
particles are given a negative charge by a
high-voltage generator, the particles oppose
each other, causing them to become
atomized. This causes more of the paint
overspray to be attracted and pulled against
the vehicle body. Less paint is wasted as
overspray. It should be mentioned that this
type of spray equipment is generally not
used in the auto body shop.

9. HVLP Spray
Gun
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The high-volume, low-pressure (HVLP) spray gun (also known as the high-solids
system) uses a high volume of air delivered at low nozzle pressure to atomize paint into a
pattern of low speed particles. This type of system is required in many areas to pass strict
air emission or pollution standards. The most important way it differs from conventional
spray systems is its high transfer efficiency.
High-transfer efficiency means that more of the material leaving the gun stays on
the surface being refinished. Less material is wasted and is prevented from entering the
atmosphere as air pollution. This is the primary purpose of HVLP guns
The high pressure of conventional spray guns tends to “blast” the paint into small
particles. In the process, it creates a fair amount of overspray. The transfer efficiency of
high-pressure systems suffers as a result of overspray, particle “bounce,” and blow back.
HVLP will work with any material that can be atomized by a spray gun, including
two-component paints, urethanes, acrylics, epoxies, enamels, lacquers, stains, primers,
and so on. HVLP spray guns have a thicker body to allow for larger internal air passages.
Larger air passages are needed because HVLP spray guns are designed to operate on
lower line or hose pressures.

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11. HVLP
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12. LVLP Spray
Gun
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These guns use a low volume of air at low
pressure to atomize the paint and create a fine mist.
They are ideal for small to medium-sized projects and
can be used with a variety of coatings, including
lacquers, stains, and enamels.
LVLP paint guns, like HVLP guns operate at a
low pressure but they use lower volume of air when
compared to other types of air paint guns.
Due to the fact that LVLP guns use a lower
volume of air, they have an even higher transfer rate of
paint than HVLP guns and LVLP guns don’t need the
same amount of capacity for air compressors and you
can use a smaller air compressor if you don’t have a
large one.

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Pressure feeding air spray guns is where a spray
gun is attached by hoses to a remote pump or
pressurised paint tank to deliver paint to the spray gun
instead of using a paint cup attached directly to the spray
gun.
A pressure feed spray gun is a type of spray gun
that utilizes a pressure tank with dual regulators to give
you precise control over the pressure of fluid both to the
material and to the air that breaks the material up (the
atomization air). Pressure pot feed spray guns offer
excellent versatility in what you can use and also provide
you maximum control of the amount of material coming
out the nozzle.
Pressure feeding air spray guns

14. Distance
Each type of spray gun has a different distance that is
best to hold it from the products surface. For an HVLP Spray
Gun, you should typically hold the spray gun 6 – 8 inches
from the products surface. For a conventional spray gun, a
bit of a greater distance like 8 – 10 inches is typically better.
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15. Angel
Many users have difficulties applying internal coatings in small
spaces. An effective solution to this issue is to use of a long nozzle
with a small head.
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16. 3 types of nozzle
Flat cone
Flat nozzles produce a
line of spray. They are
often used in coating and
cleaning applications on
conveyors where product
is passed under a spray
bar of several fan nozzles.
Spray Angel include45°
diagonal 90°
horizontal120° angel
upward
Hollow cone
Hollow cone nozzles
produce a ring of spray.
This spray pattern will
generally consist of the
smallest droplet sizes of
any spray pattern. Angel
This cone range from 30
to 170 degrees in spray
angle depending on the
nozzle design or size.
Full cone
Produce a solid circle
of spray. These nozzles
are used when the
objective is to distribute
the fluid evenly over an
area. Angel the spray
Angle range is 10°- 170°,
and the spray area is
round depending on the
design or size
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17. 3 Types of nozzle
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Flat cone Hollow cone Full cone
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18. Spray Pattern
The spray pattern means the cross sectional shape of spray.
Selecting a suitable spray pattern for each application achieves the
most efficient spray performance.
Spray pattern changes as the spray pressure is gradually
increased from low to high.
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19. The flat fan deflector tongue-type nozzle is a unique design. The flat
fan pattern is generated by a solid stream, where the liquid exits the
orifice upon an external deflector plate (“the tongue”).
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Flat cone pattern

20. Hollow cone
pattern
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Hollow cone pattern flow design, the rotary motion of the
liquid is generated by the swirl insert or vane, which creates
uniform droplets in a ring pattern.

21. Full cone
pattern
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Full cone pattern spray completely within the interior
of a circular area and provide full coverage.

22. TYPES OF SOLID COLOR PAINT
• Single Stage Paints:
These paints combine
the color and clear coat
in one application. They
are simpler to apply but
may not provide as much
depth or durability as
multi-stage systems.
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23. • Basecoat:
This type involves
applying a colored base
layer first, followed by a
clear coat. It allows for
better color matching
and often results in a
more vibrant finish.
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24. • Acrylic Enamel:
Known for its
durability and glossy
finish, acrylic enamel is
a popular choice. It
requires a separate
clear coat for added
protection.
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25. • Urethane:
Urethane paints
offer excellent
durability and chemical
resistance. They are
commonly used in
modern automotive
finishes.
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26. • Water-Based Paints:
Increasingly used
for environmental
reasons, water-based
paints emit fewer
volatile organic
compounds (VOCs).
They provide good
coverage and are eco-
friendly.
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27. • Solid Metallic Paints:
These are solid
colors with metallic flakes
added, providing a subtle
shimmer. They often
require a clear coat for
protection.
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28. • Matte and Satin
Finishes:
These finishes lack the
glossy appearance of
traditional paints and are
popular for achieving a
unique, understated look.
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29. Thank you!