Fabric (woven – knitted – or nonwoven textile or cloth – etc.) – Woven fabric – Including a strip or ribbon
Patent
1997-06-06
2000-06-27
Cole, Elizabeth M.
Fabric (woven, knitted, or nonwoven textile or cloth, etc.)
Woven fabric
Including a strip or ribbon
428332, 428920, 428921, 47 17, D03D 1512
Patent
active
060806885
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention refers to a flameretardant, long-time UV-stabilized drapeable screen for shading and energy saving, particularly for greenhouses, and of the kind comprising flexible strips with a thickness less than 100 .mu.m, which by means of a crochet or weave process and a yarn system form a continuous product, where the strips comprise at least a part of the surface of the product, and at which at least some of the strips comprise light and/or heat reflecting foil strips, e.g. a low emitting metal foil, preferably an AL-foil.
BACKGROUND OF THE INVENTION
Screens in accordance with above are used for protection of plants outdoors and inside greenhouses, for adjustment of the in- and outflow of radiant energy, so that the plants are protected against too strong sunlight and against too high or too low temperatures. These screens extend vertically and/or horizontally over very large areas, for instance set-ups with up to 30 000 m.sup.2 occur. Such a screen set-up protects large values, since plants may represent a value of about 100 US dollar per square meter. Electrical motors are used to maneuver the screens between active and inactive positions. Such a greenhouse screen is described in EP 0109951 and comprises narrow strips of plastic foil, which strips are held together by textile threads and may consist of a polyester foil being metallized on one of its sides.
Fires can start in screen systems e.g. because of defects in electrical systems, by repairings such as welding, or when a vehicle is driven inside the greenhouse under a screen system. It has been shown that these fires can spread rapidly over large areas via the screens. Such fires may injure people working in the greenhouse and damage the greenhouse in itself. Besides, the vegetation which the screen is meant to protect, is destroyed.
It has also proven hard to modify known plant protection screens, so that they become flameretardant with maintained protection against UV-radiation, during a life expectancy of at least four to five years, without at the same time being very bulky in a drawn aside position.
Flameretardant textiles are used in certain environments where one wants to limit the risk of a small local seat of fire being spread over a larger area.
Flameretardant yarn textiles are complicated to produce, because of the long way of manufacturing. Such known textiles are not heat; reflecting, transmit light to a low extent, are dirt accumulating and water absorbing. Moreover, they do just partly reflect solar radiation. The production cost is high and the width limited. These flameretardant textiles are not usable in connection with greenhouses.
Lately, the technical evolution in the area of plastic film has reached so far, that the flameretardancy is satisfied, but the big problem remains, to overcome and slow down the ageing phenomenon, so the user can be guaranteed a definite life of the plastic film. The difficulties have been, that the addition of halogen, in order to improve the flameretardancy, has taken place at the expense of the UV-stability, which was reduced to such an extent that the material was falling to pieces, either already by production or shortly after being exposed to UVrays.
AU-A-79349/91 describes a flameretardant laminate to be used as insulation layer and diffusion barrier within the building sector. This laminate can at its most be used as roller blind, but it does not meet the demands for a greenhouse screen, since the laminate is waterproof, which means that large pools of water may be formed on the horizontal parts of the greenhouse screen, for which water load the screen system is not dimensioned. Condensation water can be gathered at the underside of the laminate and drip down onto the plants, which then get damaged. Nor does the laminate possess the necessary characteristics, i.e. the quality to be able to be draped, which is required for being able to displace the curtain sideways and park it in the form of a narrow package, which steals a minimum of incoming light.
Polymers
REFERENCES:
patent: 4304746 (1981-12-01), Yamada et al.
Andersson Hans
Henningsson Goran
Cole Elizabeth M.
Ludvig Svensson B.V.
Nissim Stuart H.
Woodbridge Richard C.
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