Low-E Glass Inline Sputtering Coating System, Solar Control
Production Coater by Magnetron Sputtering
What is Low-E Glass?
Glass is one of the most popular and versatile building materials
used today. One reason is because of its constantly improving solar
and thermal performance. And one way this performance is achieved
is through the use of passive and solar control low-e coatings. So,
what is low-e glass?
In order to understand coatings, it’s important to understand the
solar energy spectrum or energy from the sun. Ultraviolet (UV)
light, visible light and infrared (IR) light all occupy different
parts of the solar spectrum – the differences between the three are
determined by their wavelengths.
- Ultraviolet light, which is what causes interior materials such as
fabrics and wall coverings to fade, has wavelengths of 310-380
nanometers when reporting glass performance.
- Visible light occupies the part of the spectrum between wavelengths
from about 380-780 nanometers.
- Infrared light or heat energy, is transmitted as heat into a
building, and begins at wavelengths of 780 nanometers. Solar
infrared is commonly referred to as short-wave infrared energy,
while heat radiating off of warm objects has higher wavelengths
than the sun and referred to as long-wave infrared.
Low-e coatings have been developed to minimize the amount of
ultraviolet and infrared light that can pass through glass without
compromising the amount of visible light that is transmitted.
When heat or light energy is absorbed by glass it is either shifted
away by moving air or reradiated by the glass surface. The ability
of a material to radiate energy is known as emissivity. In general,
highly reflective materials have a low emissivity and dull darker
colored materials have a high emissivity. All materials, including
windows, radiate heat in the form of long-wave, infrared energy
depending on the emissivity and temperature of their surfaces.
Radiant energy is one of the important ways heat transfer occurs
with windows. Reducing the emissivity of one or more of the window
glass surfaces improves a window’s insulating properties.
This is where low emissivity or low-e glass coatings come into
play. Low-e glass has a microscopically thin, transparent coating –
it is much thinner than a human hair – that reflects long-wave
infrared energy (or heat). Some low-e’s also reflect significant
amounts of short-wave solar infrared energy. When the interior heat
energy tries to escape to the colder outside during the winter, the
low-e coating reflects the heat back to the inside, reducing the
radiant heat loss through the glass. The reverse happens during the
summer time.. To use a simple analogy, low-e glass works the same
way a thermos does. A thermos has a silver lining, which reflects
the temperature of the drink it contains back in. The temperature
is maintained because of the constant reflection that occurs, as
well as the insulating benefits that the air space provides between
the inner and outer shells of the thermos … similar to an
insulating glass unit. Since low-e glass is comprised of extremely
thin layers of silver or other low emissivity materials, the same
theory applies. The silver low-e coating reflects the interior
temperatures back inside, keeping the room warm or cold.
----- Above information provided by PPG Glass Education
The design of the machine enables an easy access to the magnetrons
and sputtering environment for maintenance.
Service Vakia Provides
Turnkey Coating Solutions: from cleaning line, drying line,
loading/unloading line, film lamitation machine,
coating process all are avaible from Vakia.
Projects for Reference