Electron Beam Metallizing
This method of metallizing is similar to evaporative coating in many ways. The main difference is the manner in which the metal is heated and transformed into metal vapor. A beam of high energy electrons is aimed at the source of metal. This energy causes the molecules to vaporize and form a cloud of metal gas. The metal gas bond to the film as it cools. The temperatures obtained on the surface of the metal during this process are much higher than the other methods of coating. Many exotic and precious metals can be coated in this manner. Electron beam films have higher water vapor transmission rates than sputter coated films. This allows the films to dry much more quickly, especially in high humidity areas. Benefits of electron beam films include high light transmission, low visible light reflection, high solar heat rejection and reduced “hazing” or “fogging” during the curing period that often occurs with sputter coated films.
SPutter Metallizing has brought space age technology to the solar control market. This advanced method of coating uses exotic metals which cannot be evaporative coated. In the sputtering process, an electrically charged gas (Usally argon) bombards the metal and knocks molecules loose. These molecules are deposited onto the film and layered side by side providing extremely thin, tight and optically precise coatings. The coating is so tight that the water used during installation of the window films cannot evaporate and thus giving the “hazy” look during the curing period. This “hazy” look will gradually dissipate and give way to a beautiful film. High light transmission, very low visible reflectivity and impressive solar heat control are the trademarks of sputter films.
Corrosion Protected Silver
One window film with superior performance is our Corrosion protected Silver. This is a sputtered film with a layer of precious metal silver, encapsulated between two layers of a proprietary super alloy to protect it from corrosion. Silver is the best material available for reflecting infrared energy. The special super alloy that protects the silver actually helps to decrease the visible light reflectivity of the silver. While the superior adhesion of this structure will contribute to a slightly longer drying time and the subsequent haze associated with this drying phase. Like other sputtered films, the haze will gradually dissipate revealing a beautiful film with superior performance characteristics.
Understanding Solar Energy and Window Films
Solar Radiation is a form of electromagnetic radiation. All such forms of energy can be expressed as a wavelength. The electromagnetic spectrum of solar energy as it bombards the earth is split into threee bands by wavelengths; the ultraviolet (UV) band, the visible band and the near infrared band.
The UV band (100-400 nanometers) is the part of the spectrum that causes fading in our interior furnishings, carpets and draperies. It also tans the skin and can bause medical problems like skin cancer if exposure is excessive. The UV band make up 3% of the solar spectrum. The visible band (380-780 nanometers) is the only part of the solar spectrum actually seen with our eyes, perceived as visible light. Solar intensity is the strongest in the visible band and peaks in the green wavelength – the color of most things on earth. 44% of solar energy is visible light. The near infrared (700-2400 nanometers) part of the spectrum is the heat band. It cannot be seen but we experience it as heat. 53% of solar energy is near infrared. Another band, the far infrared, is a tiny section beyond the near infrared region.
While solar energy does not contain far infrared, you can feel it as heat that is re-radiated from objects exposed to sunlight. Windows, furnishings, and even our skin will give off far infrared heat after absorbing solar energy. The sun’s energy is necessary for life on earth. However, the same energy causes problems like overheated living space like the inside of our homes and our car interiors. It also causes glare, fading and high utility costs. Professionally installed high quality window film goes a long way in solving these problems.
Definitions for Solar Engineering Parameters
Total Solar Transmission - The percentage of incident solar radiation to be directly passed through a glazing system.
The Solar Reflectance - The percentage of incident solar radiation to be reflected by a glazing system.
Total Solar Absorption - The percentage of incident solar radiation to be absorbed by a glazing system.
Visible Light Transmission - The Percentage of visible light to be passed through a glazing system.
Visible Light Reflectance - The percentage of visible light to be reflected by a glazing system that can be seen visually.
U-Value - The measurement of heat transfer due to outdoor/indoor temperature differences; describing the dealt loss through a material. The lower the U-Value, the less heat transfers.
Ultraviolet Transmission - The percentage of the total ultraviolet radiation that passed through a glazing system.
Shading Coefficient - The ratio of solar heat gain passing through a glazing system to the solar heat gain that occurs under the same conditions if the window were made of clear, un-shaded double strenght window glass. The lower the numbers the better the solar shading qualities of the glazing system.
Emissivity - The measurement of the surface’s ability to absorb or reflect far-infrared radiation. The lower the number the higher the far-infrared reflection.
Total Solar Energy Rejected - The measurement of the window film’s ability to reject solar heat in the form of visible light and invisible infrared radiation.