Classifications

• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
  • A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
  • A01G9/14—Greenhouses
  • A01G9/1438—Covering materials therefor; Materials for protective coverings used for soil and plants, e.g. films, canopies, tunnels or cloches
• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
  • A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
  • A01G9/14—Greenhouses
  • A01G9/1438—Covering materials therefor; Materials for protective coverings used for soil and plants, e.g. films, canopies, tunnels or cloches
  • A01G2009/1453—Covering materials therefor; Materials for protective coverings used for soil and plants, e.g. films, canopies, tunnels or cloches containing textile products
• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
  • A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
  • A01G9/14—Greenhouses
  • A01G9/1438—Covering materials therefor; Materials for protective coverings used for soil and plants, e.g. films, canopies, tunnels or cloches
  • A01G2009/1461—Covering materials therefor; Materials for protective coverings used for soil and plants, e.g. films, canopies, tunnels or cloches containing woven structures
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
  • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
  • Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
  • Y02A40/25—Greenhouse technology, e.g. cooling systems therefor
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S428/00—Stock material or miscellaneous articles
  • Y10S428/913—Material designed to be responsive to temperature, light, moisture
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/30—Woven fabric [i.e., woven strand or strip material]
  • Y10T442/3033—Including a strip or ribbon
  • Y10T442/3041—Woven fabric comprises strips or ribbons only
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/40—Knit fabric [i.e., knit strand or strip material]
  • Y10T442/425—Including strand which is of specific structural definition

Definitions

• the present invention concerns a greenhouse screen of a film, textile or non-woven material with high resistance to light digradation and good weathering characteristics.
• Shadow curtains have been used the primary purpose of which is to prevent undesirable sunshine so that the plants do not overheat. Of all sunshine about 45% ius visible light, that is photosynthetic light, while the remainder, about 55% only gives heat. An ideal shadow curtain should reduce the photosynthetic light minimally and reflect all other light maximally.
• the plants requirements for photosynthetic light vary considerably from one type of plant to another and certain plants are so called short day plants which require short days to bloom quickly. If the natural day is not sufficiently short the plant must be fooled, which is achieved with blackout curtains which completely shut out the light. However blackout can cause the plant to stretch itself in an undesirable way or cause blooming to be delayed.
• the blackout curtain can also have the characteristics of an energy curtain, that is, it should reduce the flow of heat to the cold greenhouse and thereby reduce water evaporation from the earth and plants and it should reflect heat radiation from the heating pipes, plants, earth, etc in the greenhouse. As different plants are variously sensitive to light and temperature very stringent requirements are placed on the growers experience and knowh ⁇ w that the correct steps are taken at the right time.
• the purpose of the present invention is to achieve a greenhouse screen which combines the characteristics which a shadow curtain and a blackout curtain and in certain cases also an energy curtain have.
• a shadow curtain it should exclude undesired sunshine, that is, the sunshine that the plants cannot use in photosynthesis.
• the balckout curtain should simulate short daylight hours so that the plant can develop in the desired manner, and the energy curtain should reduce heat conve-ction and energy costs through its ability to reflect light, and have a high absorption cabability in order to prevent water condensation.
• the greenhouse screen at least partly consist of a mattrial which is sunshine absorbing in a significant part of the wavelength interval 575-800 nm, preferably with a maximum in the interval 600-750 nm, while the photosynthes light of the sunshine of wavelength interval 400-575 nm is mainly transmitted through the material.
• greenhouse screens with larger or samller portions of said sunshine absorbing and/or reflecting material and through addition of material with other functions greenhouse curtains can be made with widely varying characteristics. Accordingly, it is possible to keep the short day plant in both a vegetative and an inducing phase and in that way shorten the production time essentially (with about 15%).
• the greenhouse screen according to the invention can be appropriately made of a film material which absorbs light in a significant part of the wavelength interval 575-800 nm. while the photosynthes light of the sunshine of the wavelength interval 400-575 nm is mainly transmitted through the material.
• the film material is incorporated in the greenhouse screen in the form of narrow strips which can be connected in a variety of different ways, for example through knitting methods where the film strips are fixed relative to each other by a thinly woven yarn skeleton.
• the mesh size between the film strips should then be as little as possible so that the relative surface of the strips is as large as possible.
• the strips can be connected by weaving whereby the warp can consist of the film strips while the wefts are appropriately made of very thin threads of a synthetic textile material. It is even possible that the wefts consist of film strips, in which embodiment two strips on top of each other have the desired light absorption in the given wavelength interval 575-800 nm.
• the film strip material's absorption curve does not necessarily have to be constant, but it should have its maximum in the interval 600-750 nm, from which interval the absorption can decrease successively.
• a larger or smaller amount of other material strips with specific functions can be incorporated in the greenhouse screen.
• a certain percentage of the curtain's total area can consist of strips of highly reflective, low emittance film material such as aluminium foil, which then also functions as a blackout curtain, in addition to the said sunshine absorbing material strips. It is even possible that a certain amount of white film strips be included in the curtain in order to achieve a certain shadow effect.
• the highly reflecting, low emittance aluminium strips can be provided with a heat radiation absorbing layer on their undersides, that is the sides facing toward the plants.
• the width of the strips can also be adjusted according to requirements and needs, such as ease in hanging, and can vary from a few millimeters to several centimeters. From experience one knows which plants are very sensitive to light and which ones are more robust. Such experience is used in making the greenhouse screens so that the grower has access to different types of curtains and can adjust the light screening to both the type of plant and its needs and to the season and weather.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Soil Sciences (AREA)
• Environmental Sciences (AREA)
• Greenhouses (AREA)
• Protection Of Plants (AREA)
• Catching Or Destruction (AREA)
• Laminated Bodies (AREA)
• Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
• Separation By Low-Temperature Treatments (AREA)
• Control Of Motors That Do Not Use Commutators (AREA)
• Curtains And Furnishings For Windows Or Doors (AREA)
• Glass Compositions (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20356662

Family Applications (1)

Country Status (14)

Cited By (1)

Families Citing this family (21)

Citations (4)

Family Cites Families (14)

• 1984
  • 1984-08-06 SE SE8403986A patent/SE8403986L/xx not_active Application Discontinuation
• 1985
  • 1985-08-05 DE DE8585850254T patent/DE3574329D1/de not_active Expired
  • 1985-08-05 ES ES545902A patent/ES8702110A1/es not_active Expired
  • 1985-08-05 EP EP85850254A patent/EP0172151B1/en not_active Expired
  • 1985-08-05 AT AT85850254T patent/ATE48064T1/de not_active IP Right Cessation
  • 1985-08-05 GR GR851918A patent/GR851918B/el unknown
  • 1985-08-05 DD DD85279464A patent/DD239513A5/de not_active IP Right Cessation
  • 1985-08-05 WO PCT/SE1985/000301 patent/WO1986001072A1/en not_active Ceased
  • 1985-08-06 IL IL76030A patent/IL76030A0/xx unknown
  • 1985-08-06 ZA ZA855917A patent/ZA855917B/xx unknown
  • 1985-08-06 PL PL25487485A patent/PL254874A1/xx unknown
  • 1985-08-24 CN CN85106375A patent/CN85106375A/zh active Pending
• 1986
  • 1986-04-04 DK DK153186A patent/DK153186D0/da not_active IP Right Cessation
• 1987
  • 1987-09-29 US US07/102,570 patent/US4761913A/en not_active Expired - Fee Related

Patent Citations (4)

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