The multi-wall polycarbonate glazing sheets offer quite a number of structural benefits.This has been due to their artistic design where their internal structure is designed with air spaces or cells.
These air spaces from the boundary between the polycarbonate walls.Their versatility has been one of the main reasons why these products are used for a number of engineering applications.
The multi-wall polycarbonate sheets are popular for their high impact resistance and energy-saving properties. Examples of multi-wall sheets include a twin-wall,triple-wall,four walls, five walls and six walls.
The air spaces in between the polycarbonate walls may be in the form of a rectangular or square shape though these depend on the manufacturer’s design.
All these designs still feature load resistance, light transmission and thermal insulation.
Other multi-wall polycarbonate glazing sheets may be designed with special structure to meet the specific requirements of certain applications.
For instance,they can be designed with an internal cross-brace structures which give them an extra strength than the ordinary polycarbonate sheets.
Their strength is twice that of the other polycarbonate sheets.Such designs are mainly constructed for heavy loads. Furthermore,there are those with an inner X-brace structure which is specifically designed to provide extra strength and a superior thermal insulation.
The multi-wall polycarbonate glazing sheets can be constructed with special layered sheets.This mainly done to control the amount of light penetrating through the polycarbonate sheet.
That is,they selectively allow a given amount of light to pass through the enclosed space by reflecting and absorbing a given portion of the solar radiation.
For example,the sheets can be designed in such a way that they create a special metallic shading effect.
Such multi-wall polycarbonates have special pigments which add a metallic luster thereby providing an optimal solar radiation reflection.
Again,some may be designed to block certain types of light wavelengths such as those that are near infra-red radiations thereby transmitting larger quantity of visible light radiation.
There’re PC sheets which have been designed to supply plants with the natural solar light to maximize on the photosynthesis process.
Such sheets have been designed to block the UV radiation.These polycarbonate panels mainly supply the high blue and red spectrum.
At the same time,they reflect the green portion which is not required by the plants and the excess heat which may cause the burning effects to the plants.Such polycarbonate sheets are mainly used to construct greenhouses.
The thermal insulation properties are a key issue when it comes to the design and use of multi-wall polycarbonate sheets.
Although the mechanical properties of polycarbonate sheets tend to remain the same over a wide range of temperature.
when they are exposed to high temperature for a very long time,they may begin to turn yellow.This is a clear indication of UV degradation.
Since polycarbonate sheets have a relatively high thermal expansion of about 6.7×10-5m/m•°C it is advisable to leave an allowance which can allow for both contraction and expansion of the polycarbonate sheets.
The U-value and the thermal insulation are also other distinct properties that should be considered.
This panel has superb thermal insulation properties and this has been one of the reasons why the multi-wall polycarbonate glazing panels are used in the construction of greenhouses.