Fire-resistant, resistant to uv radiation for a long time draped screen
(57) Abstract:The invention relates to shielding devices to protect from light and can be used in greenhouses for growing plants. Draped screen includes a flexible strip with a thickness less than 100 microns, which through a process of knitting or weaving weave and thread systems form a solid product, where the strips are at least part of the surface of the product. At least part of the strips contains light and/or heat-reflecting strips of foil, for example of the foil with low emission of metal, preferably aluminum foil. The strips are made of halogen - or fosforsoderzhashchie polymer film. System threads at least partially consists of fire-resistant material, for example from modacrylic or polyester, or mixtures thereof. The present invention allows to create bad flammable, resistant to ultraviolet irradiation for a long time the screen is permeable to water. 10 C.p. f-crystals. The invention relates to fire-resistant, resistant to UV radiation, draped screen for shade and energy conservation, particularly for greenhouses, and which contains a flexible floor will formed solid product, where the strips are at least part of the product surface, on which at least part of the strips contains light and/or heat-reflecting strips of foil, for example, from (foil with low emission of metal, preferably aluminum foil.The screens described above, are used to protect plants outdoors and in greenhouses, to regulate the admission and exit of the radiant energy so that the plants are protected from too strong solar radiation and from too high or too low temperatures. Such screens are installed vertically and/or horizontally over a very large area, for example, there are devices with an area of up to 30,000 m2. This shielding protects valuable products, as plants can cost around 100 US dollars per 1 m2. To move the screen between active and inactive position used motors. Such greenhouse screens described in the patent EP 0109951. They contain a narrow strip of plastic foil, and these strips held together by means of textile yarns may consist of polyester foil, metallized on one side.The screening system can be ignited, for example, seedsto enters inside the greenhouse under the display system. It is shown that such fire can quickly spread to a large area through the screens. Such fires can affect people working in the greenhouse, and to corrupt themselves greenhouses. Moreover, damaged vegetation that should be protected with the help of the screen.In addition, as has been known screens to protect the plant difficult to modify so that they become refractory and retained the ability to protect plants from UV radiation for at least 4-5 years and that at the same time they do not occupy much space when allocating them to the side.Fire-resistant fabrics used in some areas when it is necessary to limit the risks of proliferation of local fire over large areas.Fire resistant fabric is difficult to obtain because of the long production process. Such well-known fabric does not reflect heat, bad pass light, accumulate dirt and absorb water. Moreover, they only partially reflect solar radiation. The cost of production is high, and the width of the resulting tissue is limited. Such fire resistant fabric may not be used for greenhouses.In recent times technological evolution in the field of polim is of avoiding or significantly reducing the effects of aging, in order to guarantee the consumer a certain lifetime of the polymer film. The problem lies in the fact that the introduction of the halogen with the aim of improving the fire resistance is accompanied by loss of resistance to UV radiation, which is reduced to such an extent that the material is separated into pieces or immediately after receipt or after short-term exposure to UV radiation.In the patent AU-A-79349/91 describes a flame-retardant laminate (laminate) for use as an insulating layer and a diffusion barrier during construction. This laminate can be used at most as Venetian blinds, but it does not satisfy the requirements of the screens for greenhouses, as this laminate is waterproof. That is, in horizontal sections of the screen for greenhouses will be collected large amounts of water. Water condensation can collect on the bottom surface of the laminate, dripping on the plants and damage them. Also layered material does not possess the necessary characteristics, for example, the ability to drape, which is required in order to be able to move the curtain (curtain) - side, and leave it in a compact package that takes heaven reduces Flammability, has a high cost. In addition, in the manufacture of screens for protection of plants there is also a need to create materials with different degree of light transmission.Some characteristics, such as, for example, the ability to drape, to move toward and easy installation, in combination with the requirement of low weight and small volume, leads to the fact that the thickness of the materials that are part of the canopy, which largely consists of strips must be very small. This condition is partly very difficult to reconcile with the desired long-term resistance to UV radiation, which is easier to achieve for a more subtle layered polymer film (filter effect) and partly with the requirement of bad Flammability, when the amount of material affects the ability to self-extinguishing. Thin material contains a small amount of protection from fire.The aim of the present invention is the creation of poorly flammable, resistant to ultraviolet irradiation for a long time, draped screen, which is permeable to water, does not have the above disadvantages and cost Pauls present invention, which are distinguished by the fact that made from halogen - or fosforsoderzhashchie polymer film, so that at least a certain number of strips is covered with the above-mentioned strip of foil and the fact that the system thread at least partially consists of fire-resistant material, for example, from modacrylic, polyester or mixtures thereof.The screen can be divided into alternating longitudinal zone of flammable materials and fire-resistant material.The invention relates I draped the screen for protection of plants, and this screen consists of flexible strips, which through a process of knitting or weaving weave and thread systems form a solid product.At least some number of strips consists of a light and/or heat-reflecting strips of foil, for example, foil with low emission of metal, preferably aluminum foil.Strips of foil are applied to the strips of the polymer film of a halogen - or phosphorus-containing polymers, such as polyvinyl chloride (PVC), grades (PVDC), polychlorotrifluoroethylene (PCTFE) polivinilhlorid (PVF), polyvinylidene fluoride (PVDF), FEP, polytetrafluoroethylene (PTFE), ethylene/tetrafluoroethylene (e/TPV) or polyeth alauda UV radiation, than strips of aluminum foil or similar layered strips. These transparent strips are made of polymer, resistant to ultraviolet irradiation for a long period of time with a lower content of halogen.At least part of the strips of polymer film laminated strips of aluminum foil. Strips of polymer film should have a thickness less than 100 μm, preferably 20-30 μm, and strips of metal foil should have a thickness less than 30 μm, preferably 9 μm.Plastic film and aluminum foil can be joined together by layering, for example, using an adhesive based on polyurethane with the addition of rich air. On the other hand, a laminate (laminate) can be obtained by co-extrusion, extrusion lamination, etc.When the screen with foil contains a large number of flexible strips of polymer film, which form a continuous knitted product, where strips of polymeric films comprise at least part of the surface of the product, layered strips can be stretched at least in the longitudinal direction of the product with the threads on at least one of the wide sides on the Board of the Foundation of the product, with cotton pads in the direction of the substrate and/or weft of the product.In both cases, the system thread can at least partially be composed of slavophones material, for example from modacrylic, polyester or mixtures thereof. On the other hand, a thread may at least partially consist of slavophones material, for example, from a polymer containing halogen. The density of the filaments is 1-10 threads on 1 cm2. This means that a drop of liquid deposited on the canopy, are absorbed by the system thread.It is not necessary that all of the strips of the screen consisted of slavophones material, but one or more strips of slavophones material may alternate with one or more strips of flammable material. In practical tests it has been unexpectedly found that the selected polymeric materials when burned produce such quantities of gas prevents burning that are protected even adjacent areas of tissue. Moreover canopy foil can be divided into alternating longitudinal zone of flammable material and slavophones material.Strips of the screen may, for example, to include white sweetooth strips can also be obtained in the form of layered material partially containing non-woven film, made of slavophones material, and partially light and/or heat-reflecting foil, for example of the foil with low emission of metal, preferably aluminum foil.The present invention is not limited to the above-described embodiments and the following claims cover other forms of execution. 1. Weakly flammable, resistant to ultraviolet irradiation for a long time draped screen for shade and energy conservation, such as greenhouses containing flexible strips, which through a process of knitting or weaving weave and thread systems form a solid product, where the strips are at least part of the surface of the product, and in which at least part of the strips contains light and/or heat-reflecting strips of foil, for example of the foil with low emission of metal, preferably aluminum foil, characterized in that the strips are made of halogen - or fosforsoderzhashchie polymer films and their thickness is less than 100 microns, and at least part of the laminated strips above the strips of foil, and the threads of the art.2. The screen on p. 1, characterized in that at least some of the strips absorb the light and made of UV irradiation for a long time polymer with a lower content of halogen.3. The screen on p. 1, characterized in that the supporting basis for the strips of foil are made of strips of polymeric film, preferably a polymer containing halogen, such as polyvinyl chloride (PVC), grades (PVDC), polychlorotrifluoroethylene (PCTFE), polivinilhlorid (PVF), polyvinylidene fluoride (PVDF), tetrafluoroethylene/hexafluoroethylene (FER), polytetrafluoroethylene (PTFE), copolymer of ethylene/tetrafluoroethylene (e/TPV) or polyethylene terephthalate (PET).4. The screen on p. 3, characterized in that the strips of polymer film has a thickness of less than 100 μm, preferably 20 to 30 μm, and the metal foil laminate has a thickness less than 30 μm, preferably 9 μm.5. The screen on p. 2, characterized in that the polymer film and metal foil are connected to each other, for example, using fire-resistant glue.6. The screen on p. 1, wherein the product is obtained by osnovateltnomu technology, and layered strips of protagen what about the product is obtained through the weave, layered strips extend at least toward base with cotton pads in the direction of the substrate and/or weft of the product.8. The screen on p. 1, characterized in that thread, at least partially, consists of slavophones material, for example of polymers with additives halogen - or phosphorus-containing compounds, glass and similar materials.9. The screen on p. 1, characterized in that one or more layered strips of slavophones material are alternately by one or more strips of flammable material.10. The screen on p. 1, wherein the solid product is divided into alternating longitudinal zone of flammable materials and fire-resistant material.11. The screen on p. 1, characterized in that the system of yarns composed of filaments made from cut longitudinally oriented polymeric film.
FIELD: agriculture, in particular, screening systems for greenhouses used in agricultural production, farms and house plots.
SUBSTANCE: screening system has additional bars in reduced length spans, said bars being out of connection with drive and mounted for progressive movement in parallel with main bars of greenhouse screening system. Carriers are secured on screening beam of previous span of greenhouse, above additional bars for supporting the latter. Carriers may be equipped with rollers. Such construction ensures predetermined mutual arrangement of previous span beam and additional bar during displacement thereof relative to one another and provides support for free end of additional bar. Stops are secured on additional bars on both sides of carrier at distance therebetween providing free movement for carrier upon displacement of screening beam of previous span. Free movement is adjusted by displacement of stops on additional bars, and value of said movement should provide reduced screening pitch of reduced span of greenhouse.
EFFECT: increased efficiency and enhanced reliability in operation of screening apparatus.
2 cl, 4 dwg
SUBSTANCE: invention refers to agriculture. Method involves cutting of furrow in soil, installation of tray into it, seed sowing, transplanting into soil and watering through holes made at tray bottom. Waterproof screen with grooves made on one of side edges is placed between side walls of tray and inclination is given to it in direction of grooves.
EFFECT: method allows protecting plants against glased rain and provides control of plant watering owing to atmospheric moisture.
SUBSTANCE: invention relates to polymer compositions for making fluorescent and selectively radiation-absorbing films, which transform the ultraviolet component of natural or artificial light into radiation in the red region, which can be used in agriculture to coat greenhouses and soil when growing plants. The light-correcting polymer film contains a photoluminescent phosphor and a light-stabiliser, where the photoluminescent phosphor is yttrium phosphate-vanadate-borate activated with europium and/or yttrium phosphate vanadate activated with europium, and the light stabiliser is Tinuvin 622. The composition for making a light-correcting polymer film contains yttrium phosphate-vanadate-borate activated with europium and/or yttrium phosphate-vanadate activated with europium - 1.0-5.0 wt %, Tinuvin 622 - 1.0-3.0 wt % and high-pressure polyethylene - the rest. Composition is in form of granules which are a concentrate of modifying additives in a polymer matrix.
EFFECT: longer service life of the film.
8 cl, 1 dwg, 5 tbl, 4 ex