WO1996010107A1 - Light reflecting screen - Google Patents
Light reflecting screen Download PDFInfo
- Publication number
- WO1996010107A1 WO1996010107A1 PCT/US1994/010876 US9410876W WO9610107A1 WO 1996010107 A1 WO1996010107 A1 WO 1996010107A1 US 9410876 W US9410876 W US 9410876W WO 9610107 A1 WO9610107 A1 WO 9610107A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layer
- net
- film
- oriented
- wefts
- Prior art date
Links
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
- A01G9/22—Shades or blinds for greenhouses, or the like
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B21/00—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
- D04B21/10—Open-work fabrics
- D04B21/12—Open-work fabrics characterised by thread material
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2401/00—Physical properties
- D10B2401/22—Physical properties protective against sunlight or UV radiation
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2503/00—Domestic or personal
- D10B2503/02—Curtains
-
- 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
Definitions
- the present invention concerns nets intended to be used as thermal screens and having light reflecting properties. Such screens will be referred to herein as "light reflecting screens".
- Light reflecting screens are routinely used for various purposes, the most common one being in partial shading of areas. For example, in greenhouses it is at times desired to allow only part of the solar radiation to penetrate the greenhouse in order to avoid access solar radiation which may damage the plants. It is a common practice to use light reflecting screens therefor which allow only partial penetration of the solar light. However, such screens can absorb also some of the solar light and emit heat and in order to reduce this heating effect, such screens, which were typically woven nets, were partially supplemented with light reflecting bands, usually made of aluminum foil.
- the present invention provides a net having a plurality of threads oriented in one direction and being essentially equal spaced from one another, and having wefts oriented in a second direction which is perpendic ⁇ ular to said one direction, the threads forming stitches which hold the weft in position in the net; the wefts consisting of bands made of a flexible laminate having a first layer consisting of a transparent, mono-oriented polymeric film having an axis, as herein defined, which is in the direction of the band's longitudinal axis, a second layer on said first layer consisting essentially of aluminum, and a third layer on said second layer consisting of transparent material capable of protecting said second layer from degradation.
- a net is formed having wefts consisting of bands made from a flexible laminate, i.e. from a flexible multi-layer polymer-based film. It is the use of such laminates which allows the formation that light reflecting screens in the form of nets, which have very good light reflecting properties on the one hand and high tensile strength on the other hand. Furthermore, the high tensile strength of the bands is also important in view of the fact that during the knitting process, the bands have to withstand high shearing forces. Mono-orientation of a film is obtained by stretching a film in one direction. The direction on which the film has been stretched to achieve the mono-orientation, will be referred to herein as "axis".
- a mono-oriented film is generally of high tensile strength, is resistant to tears in a direction perpendicular to the axis, but has a low resistance to tears in a direction parallel thereto. This fact allows to easily form bands from a mono- oriented film by cutting the film in a direction parallel to the axis.
- the bands which are formed are resistant to transverse tearing and additionally have relatively high tensile strength.
- the net is formed from the strings and bands in a manner generally known per se.
- the wefts in the net extend from one end to the other.
- the wefts between two adjacent strings are formed by a single continuous band which zigzags back and forth between and along two adjacent strings.
- Fig. 1 shows a portion of the net in accordance with one embodiment of the invention
- Fig. 2 shows a portion of a band forming the wefts
- Fig. 3 is a schematical cross-sectional view through lines 3-3 in
- Fig. 1 showing a portion of a net 10 in accordance with the present invention.
- the net consists of strings 11 and wefts 12, the wefts being essentially perpendicular to the strings.
- the strings 11 form stitches 13 holding the wefts in position in the net.
- the wefts 12 consist of continuous bands which zigzag between and along two adjacent strings of the net. Nets having this structure have good tensile strengths in all directions.
- the wefts as shown schematically in Figs. 2 and 3, are bands made of a flexible laminate having a first layer 21, consisting of a mono- oriented transparent film, a second layer 22 consisting essentially of aluminum and a third layer 23 made of a transparent material which protects the second layer from degradation.
- Mono- oriented polymeric films may be prepared from polymers such as polyolefins, polyesters, polyamides, polyimides and other polymeric film making substances and mixtures of different polymers. Examples of polymers are linear low density polyethylene (LLDPE), high density polyethylene (HDPE), polypropylene or a combination thereof. At times it may be advisable to supplement the polymers with various additives such as UV stabilizers and processing agents.
- a mono-oriented polymeric film is prepared by stretching a prepared polymeric film in only one direction.
- the stretching of a polymeric film may for example be by a factor of about 5 to 9, with a stretching factor of about 7-8 being preferred.
- the stretching factor is the ratio between the length of a unit film after stretching to its length prior to stretching).
- a mono-oriented polymeric film is prepared by a continuous extrusion process. This may be performed on a single machine, consisting of a feeding unit, an extruder equipped with a round die and a temperature control unit, an air cooling ring for cooling the material exiting from the die and a stretching unit which comprises oil heated rollers equipped with a system controlling both the heating and the turning speed of said rollers.
- the machine preferably includes also a high voltage discharge treatment unit (the discharge treatment is an electric surface treatment intended to prepare the film for lamination).
- a particular example of a mono-oriented film suitable for use in nets in accordance with the present invention is one made of HDPE.
- pellets or granules of HDPE and preferably in a mixture with some additives such as silicon-based UV-stabilizers and processing agents (e.g. HALS 622TM), known per se (0.2 and 2% relative to the amount of HDPE, respectively) are introduced to an extruder through its feeding system.
- the pellets or granules are then molded and compressed by a screw inside the extrusion cylinder which is maintained at a temperature of 175°C- 200°C.
- the molten HDPE exits through the extruder nozzle emerging as a tube which is cooled and expanded by air through an air ring, forming a polyethylene balloon having a wall the thickness of about 0.2 mm.
- the polyethylene balloon is slit on a slitting table to form an open polymeric film which is then rolled on a roller system.
- This polymeric film passes then through a stretching system.
- the stretching system comprises several heating rollers, the first one of which is suitably heated to about 100°C, and the last one to about 125°C, and a stretching roller which stretches the film emerging from the 125°C heating roller.
- the ratio of roller velocities is adjusted so as to achieve a stretching factor of about 8.
- the thickness of the polyethylene film is reduced from about 150- 200 ⁇ m to about 25-30 ⁇ m.
- the film is passed over an annealing roller and then over a cooling roller which cools the film to room temperature.
- the polymeric film is passed through the high voltage discharge treatment unit to prepare it for lamination and/or for printing.
- the obtained mono-oriented polyethylene film has typically a density of about 0.945 gr/cm 3 and a tensile strength of about 320 MPa.
- the aluminum layer is suitably formed on the first layer by vapor deposition in a vacuum.
- the vapor deposition apparatus consists of a vacuum chamber in which the pressure is reduced to about 3.5 mm Hg and to which vaporized aluminum is introduced.
- the film passes through rollers and over a cooling drum having typically a temperature of 20-25 °C.
- the cooling of the film by the cooling drum causes the aluminum vapor to deposit on the exposed film surface.
- the film passes through the vacuum chamber at a rate so that each portion stays in the chamber for about 15-30 seconds.
- the aluminum layer has typically a thickness of about 0.3 ⁇ m.
- the third layer may be another polymeric film layer, e.g. made of polyethylene, or may be a lacquer layer.
- Polyethylene coating may be applied by a flat dye coating extrusion process, and the coated film being suitably LDPE film having a thickness of about 9-12 ⁇ m.
- a lacquer layer may suitably be prepared from a solution comprising 75% water soluble resins (for example NEOREZ R961, manufactured by Imperia Chemical Industries, U.K.), 15-20% water, 4-10% ethanol and 1-5% curing agents.
- the lacquer coating is suitably of a thickness of about 3 ⁇ m.
- the multi-layer film is cut to long filaments having a width from about 1.8 to about 2.5 mm.
- the nets cam be prepared by a Raschel knitting method known “per se " in which the filaments are attached to knitting elements which comprise two needles and knock-over comb bars which are positioned opposite to one another, and comprising ground guide bars, pattern guide bars and stitch comb bars.
- the knitting density may be about 3-6 loops per cm 2 .
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Laminated Bodies (AREA)
- Woven Fabrics (AREA)
- Protection Of Plants (AREA)
- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
- Optical Elements Other Than Lenses (AREA)
- Walking Sticks, Umbrellas, And Fans (AREA)
- Overhead Projectors And Projection Screens (AREA)
Abstract
Description
Claims
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69412276T DE69412276T2 (en) | 1994-09-26 | 1994-09-26 | LIGHT REFLECTIVE UMBRELLA |
AT94930480T ATE169354T1 (en) | 1994-09-26 | 1994-09-26 | LIGHT REFLECTING SHADE |
JP7525144A JPH09506781A (en) | 1994-09-26 | 1994-09-26 | Light reflective screen |
AU79587/94A AU7958794A (en) | 1994-09-26 | 1994-09-26 | Light reflecting screen |
PCT/US1994/010876 WO1996010107A1 (en) | 1994-09-26 | 1994-09-26 | Light reflecting screen |
EP94930480A EP0723606B1 (en) | 1994-09-26 | 1994-09-26 | Light reflecting screen |
DK94930480T DK0723606T3 (en) | 1994-09-26 | 1994-09-26 | Light reflecting screen |
ES94930480T ES2122341T3 (en) | 1994-09-26 | 1994-09-26 | LIGHT REFLECTIVE SCREEN. |
HK98105597A HK1006501A1 (en) | 1994-09-26 | 1998-06-18 | Light reflecting screen |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US1994/010876 WO1996010107A1 (en) | 1994-09-26 | 1994-09-26 | Light reflecting screen |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996010107A1 true WO1996010107A1 (en) | 1996-04-04 |
Family
ID=22243037
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1994/010876 WO1996010107A1 (en) | 1994-09-26 | 1994-09-26 | Light reflecting screen |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0723606B1 (en) |
JP (1) | JPH09506781A (en) |
AT (1) | ATE169354T1 (en) |
AU (1) | AU7958794A (en) |
DE (1) | DE69412276T2 (en) |
DK (1) | DK0723606T3 (en) |
ES (1) | ES2122341T3 (en) |
HK (1) | HK1006501A1 (en) |
WO (1) | WO1996010107A1 (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1342824A1 (en) * | 2002-03-05 | 2003-09-10 | Bonar Technical Fabrics | Screen with adjustable degree of screening and climatization making use of such a screen |
WO2003087452A1 (en) * | 2002-04-12 | 2003-10-23 | Alnet (Proprietary) Limited | A water-resistant sheet material |
WO2006027637A1 (en) * | 2004-09-07 | 2006-03-16 | Tama Plastic Industry | Netting material with reflective or luminescent marker |
US7188494B2 (en) | 2003-10-22 | 2007-03-13 | Polymer Group, Inc. | Expandable knitted net |
WO2007101707A2 (en) * | 2006-03-09 | 2007-09-13 | Karatzis S.A. | Manufacturing of nets consisting of synthetic yarns and monofilament yarns |
WO2007140801A1 (en) * | 2006-06-06 | 2007-12-13 | Karatzis S.A. | Net and process for producing the net |
US7323074B2 (en) | 2003-10-22 | 2008-01-29 | Polymer Group, Inc. | Hay baling laminate of a nonwoven and a knitted net |
KR100945908B1 (en) | 2009-11-25 | 2010-03-05 | (주)부전 | Green cover for grass |
US8978342B2 (en) | 2012-06-15 | 2015-03-17 | Auburn University | Residential radiant barrier assemblies |
CN110719730A (en) * | 2017-07-17 | 2020-01-21 | 卢德维格斯文松股份公司 | Greenhouse curtain |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IL135736A (en) | 2000-04-18 | 2004-07-25 | Polysack Plastic Ind R A C S L | Net for protecting plants from light |
EP1682710A4 (en) | 2003-10-22 | 2006-12-20 | Polymer Group Inc | Durable knitted net |
EA039581B1 (en) * | 2017-11-02 | 2022-02-14 | Аб Людвиг Свенссон | Greenhouse screen |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3035232A1 (en) * | 1980-09-18 | 1982-04-01 | Geb. Wunderlich GmbH u. Co KG, 3360 Osterode | Extensible warp-knitted fabric for greenhouse blinds - having intermittent weft-inlay bands giving variable light-transmission factor |
EP0146394A2 (en) * | 1983-12-16 | 1985-06-26 | Perifleur (Holdings) Limited | Greenhouse provided with a demountable thermal insulating screen |
EP0165878A1 (en) * | 1984-04-24 | 1985-12-27 | Rhone-Poulenc Films | Metallised multilayer film for use as a heat screen |
FR2603449A1 (en) * | 1986-09-04 | 1988-03-11 | Heiden Ver Netz Seil | REFLECTIVE MAT IN TAPE FOR GREENHOUSES |
-
1994
- 1994-09-26 WO PCT/US1994/010876 patent/WO1996010107A1/en active IP Right Grant
- 1994-09-26 DK DK94930480T patent/DK0723606T3/en active
- 1994-09-26 ES ES94930480T patent/ES2122341T3/en not_active Expired - Lifetime
- 1994-09-26 EP EP94930480A patent/EP0723606B1/en not_active Expired - Lifetime
- 1994-09-26 AU AU79587/94A patent/AU7958794A/en not_active Abandoned
- 1994-09-26 DE DE69412276T patent/DE69412276T2/en not_active Expired - Fee Related
- 1994-09-26 AT AT94930480T patent/ATE169354T1/en not_active IP Right Cessation
- 1994-09-26 JP JP7525144A patent/JPH09506781A/en active Pending
-
1998
- 1998-06-18 HK HK98105597A patent/HK1006501A1/en not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3035232A1 (en) * | 1980-09-18 | 1982-04-01 | Geb. Wunderlich GmbH u. Co KG, 3360 Osterode | Extensible warp-knitted fabric for greenhouse blinds - having intermittent weft-inlay bands giving variable light-transmission factor |
EP0146394A2 (en) * | 1983-12-16 | 1985-06-26 | Perifleur (Holdings) Limited | Greenhouse provided with a demountable thermal insulating screen |
EP0165878A1 (en) * | 1984-04-24 | 1985-12-27 | Rhone-Poulenc Films | Metallised multilayer film for use as a heat screen |
FR2603449A1 (en) * | 1986-09-04 | 1988-03-11 | Heiden Ver Netz Seil | REFLECTIVE MAT IN TAPE FOR GREENHOUSES |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1342824A1 (en) * | 2002-03-05 | 2003-09-10 | Bonar Technical Fabrics | Screen with adjustable degree of screening and climatization making use of such a screen |
BE1014679A3 (en) * | 2002-03-05 | 2004-03-02 | Bonar Technical Fabrics Nv | Screen with adjustable schermingsgraad climate and making use of such a screen. |
WO2003087452A1 (en) * | 2002-04-12 | 2003-10-23 | Alnet (Proprietary) Limited | A water-resistant sheet material |
US7188494B2 (en) | 2003-10-22 | 2007-03-13 | Polymer Group, Inc. | Expandable knitted net |
US7323074B2 (en) | 2003-10-22 | 2008-01-29 | Polymer Group, Inc. | Hay baling laminate of a nonwoven and a knitted net |
WO2006027637A1 (en) * | 2004-09-07 | 2006-03-16 | Tama Plastic Industry | Netting material with reflective or luminescent marker |
WO2007101707A3 (en) * | 2006-03-09 | 2007-11-29 | Karatzis S A | Manufacturing of nets consisting of synthetic yarns and monofilament yarns |
WO2007101707A2 (en) * | 2006-03-09 | 2007-09-13 | Karatzis S.A. | Manufacturing of nets consisting of synthetic yarns and monofilament yarns |
WO2007140801A1 (en) * | 2006-06-06 | 2007-12-13 | Karatzis S.A. | Net and process for producing the net |
US8316672B2 (en) | 2006-06-06 | 2012-11-27 | Karatzis S.A. | Net and process for producing the net |
KR100945908B1 (en) | 2009-11-25 | 2010-03-05 | (주)부전 | Green cover for grass |
US8978342B2 (en) | 2012-06-15 | 2015-03-17 | Auburn University | Residential radiant barrier assemblies |
CN110719730A (en) * | 2017-07-17 | 2020-01-21 | 卢德维格斯文松股份公司 | Greenhouse curtain |
Also Published As
Publication number | Publication date |
---|---|
DE69412276D1 (en) | 1998-09-10 |
DE69412276T2 (en) | 1999-03-11 |
ATE169354T1 (en) | 1998-08-15 |
DK0723606T3 (en) | 1999-05-03 |
ES2122341T3 (en) | 1998-12-16 |
AU7958794A (en) | 1996-04-19 |
EP0723606A1 (en) | 1996-07-31 |
JPH09506781A (en) | 1997-07-08 |
EP0723606B1 (en) | 1998-08-05 |
HK1006501A1 (en) | 1999-03-05 |
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