Screens have become just as important in modern greenhouse production as the structure itself.
Energy saving and being able to control the environment within the glasshouse is now crucially important for growers. New developments in cloth materials and components means that the grower now has a far greater choice. By choosing from a large range of screen cloths the optimum growing environment is achievable within the commercial greenhouse.
With over 50 years of experience in installing screens in glasshouses of various shapes and sizes and a clear focus on quality, CambridgeHOK can help you choose the right screen for your crop and glasshouse. With increasing environmental and financial pressures, the correct screen installation helps to create the ideal climate for your crop while reducing energy costs and increasing yields.
There are a range of screens: all designed to create the perfect growing environment and climate:-
Often used as a double horizontal screen and is usually combined with vertical rolling screens for vegetable cultivation (tomatoes, peppers, cucumbers, etc.), cut flowers, pot flowers, fruit cultivation. These screens ensure a significant reduction of heating costs and limit condensation, which reduces the risk of disease. They help achieve higher yields that are a better quality product by creating a constant climate. In addition to the insulating effect of the energy saving screen, it is also much easier to control the amount of CO2 in the greenhouse.
Shading screens are usually installed horizontally for pot flowers like orchids and chrysanthemums, but also for vegetables in tropical climates and cut flowers. These screens are one of the most important tools in the modern growers’ arsenal. Using the shade screen, the grower is able to manipulate both light and/or humidity to maintain the ideal greenhouse climate. On hot days the reflective screen cloth reduces solar gain and the open construction of the cloth allows natural ventilation through the screen, creating a cooler climate within the glasshouse. At night it helps reduce the heat radiation of the crop, this ensures maximum production and quality of produce. Light transmission in the screen cloths ranges from 25 to 70%, with energy saving values from 15 to 55%.
These screens are a combination of energy saving and shade screens, and they are becoming increasingly popular as a result of rising energy costs. This is because they ensure the grower has better control over the glasshouse’s climate, light and UV pollution.
Light pollution screens are often used in a combination of horizontal and vertical screening, especially when growing crops using supplementary lighting. Greenhouse owners must meet increasing regulatory obligations on light emission- light pollution screens ensure minimal light emission and depending on the type of screen cloth, emission rates of less than 0.5% are achievable.
Through the use of light pollution screens, the light intensity of the supplementary lighting can be retained within the greenhouse. Furthermore, the light pollution screens open structure, in combination with good ventilation, helps control moisture and warmth.
With a light reduction level of over 99.9%, blackout screens are very suitable for light sensitive crops and short-day plants such as chrysanthemums. Additionally, by choosing a blackout screen with an aluminium top layer, energy savings can go up to 75%.
With an increasing trend towards reduced pesticides, using insect screens in the roof ventilators provides the perfect solution for biological crop protection, so chemical crop protection and its impact on the environment can be kept to a minimum.
Recent research has shown that uneven temperatures of their climate is one of the main reasons why many growers struggle to maintain the ideal greenhouse climate. The greenhouse is susceptible to one cold side, which is likely to cause significant delays in flowering or fruit ripening, as well as higher humidity which presents disease risk. Apex seals help towards providing the perfect solution; by installing partitions of clear screen material in the apexes above the horizontal overhead screen, the cold air above the screen is prevented from collecting at one end and therefore the temperature differentials from one growing area to the next is reduced.
Screens are equally important in the retail environment. As well as the benefits of shade and energy saving, the colourful, decorative nature of the screen cloth can be used to enhance the retail environment. The safety of the public is assured, as all garden centre screens feature fire retardant cloth.
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