Go to videoEnergy contents of the sun at our latitude and at sea level
The area between curve 1 and the baseline represents the total solar energy as measured at ground level. The vertical lines at 370 and 750 nanometres restrict the energy content of the light. The eye does not detect light at all times.
The average value is 35% as shown by curve 2. The area between curve 1 and curve 2 represents theount of energy which is stopped by a foil with 70% total reflection (equal to shading coefficient 0.30). The area between curve 2 and the baseline represents the energy leakage into the room.
The ultraviolet area is on the left of 370 nanometres, and has a relatively low energy content. Most of the UV radiation is absorbed by the glass, which explains why it is not possible to get a suntan through a window. The window will also remain relatively cold to the touch.
The transition to UV light takes place at level 370, and to red light at level 650. It must be added that those transitions are visible to the human eye. Other living creatures have the ability to see within different limits. Radiation losses at night-time, however, mainly lie within the low UV area between 8,000 and 12,000 nanometres.
According to Wien’s shifting law, shortwave radiation is transformed to longwave radiation by absorption. As window glass lets through longwave radiation slower than shortwave radiation, the so-called greenhouse effect is created. Energy is supplied faster than it is lost.Metallised Films
Ordinary water boils at 100°C at sea-level. At the top of Mount Everest where the air pressure is lower, however, water boils much quicker. In a vacuum (1/100,000 air pressure) aluminium, copper, titanium and stainless steel will all boil when heated. The steam from the melting metal condenses onto a plastic film where it is steered and controlled in order to achieve:
• increased light transmission/light reflection
• the required level of heat resolution
• the required electric conductivity.Pigmented Films
Colour pigments, metal pigments and other microscopic particles float in a high-pressure bath and are pressed into the film from both sides. The longer the film is left in the bath, the more pigment it absorbs. Once encapsulated within the film, the pigments are protected against UV-rays.
The choice of pigments determines the levels of light and heat absorption, as well as the colour of the light that penetrates the film.Combination Films
As the name implies, combination films are a combination of a metallised film with either one or two different dyed films, or a combination of two dyed films. Films can be used in BERGAFLEX shades, or permanently laminated to a window with the addition of another layer of glue.Why Metallised?
Metallised films act as mirrors – they have a unique ability to reflect high-intensity rays from the sun. This indoor solar protection is relatively cheap to buy and maintain. It also has an unsurpassable life expectancy, and is not affected by weather, corrosion or pollution.Shades
Our shades work in combination with metallised films and blackout materials. They are made with protective and functional aluminium casings. We measure up and produce the shades to integrate fully with all types of windows.
Our side rails are adequately proportioned, and may be directed and combined with our aluminium casings. For operating purposes, we can offer a cord reel or roller spring unit for casing 027, a cord reel, a tape reel shades spring unit or an electric motor for casing 069. When choosing metallised films, you should consider three factors:
1. Light transmission
2. Shadow coefficient
3. Light colour
For blackout shades, fabrics are available in different colours and with different properties (fire proof, etc.). We can, however, also use a fabric of the customer’s own choice. We measure up, make and fit the shades ourselves or via our authorised retailers.Laminated Films
These change and add value to standard window glass. Depending on the individual film, the following effect may be achieved:
• reflective glass
• light- and heat-absorbent glass
• sanitary glass
• protected glass
Most films are laminated on the inside of the glass, but some films are tested and approved for use on the outside. These are suitable for the lamination of insulated glass for which any still-valid insurance warranty against glass breakage may expire if laminated on the inside.Reflective Glass.
Different degrees of light transmission and shading can be achieved depending on the degree of metallisation.Absorbing Films.
Different degrees of light transmission and heat absorption can be achieved depending on the degree of pigmentation.Combination Films.
These are a combination of reflecting and absorbing films. Most films fall into this category.Dispersing Films.
Depending on the treatment and structure of the film, light dispersion will be achieved. The addition of pigment results in coloured light.
This film is suitable for use in dressing rooms and sanitary establishments, where a good light supply is required during the day but privacy is desirable at night.Safety Films.
Different thickness levels exist for different safety requirements. Some are available with a metallised treatment..