EP0190132A1 - Method for the manufacture of a curved face laminated reflector for reflecting radiation energy and in particular solar energy - Google Patents

Method for the manufacture of a curved face laminated reflector for reflecting radiation energy and in particular solar energy

Info

Publication number
EP0190132A1
EP0190132A1 EP84903635A EP84903635A EP0190132A1 EP 0190132 A1 EP0190132 A1 EP 0190132A1 EP 84903635 A EP84903635 A EP 84903635A EP 84903635 A EP84903635 A EP 84903635A EP 0190132 A1 EP0190132 A1 EP 0190132A1
Authority
EP
European Patent Office
Prior art keywords
layer
combination film
layers
edges
film
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP84903635A
Other languages
German (de)
French (fr)
Inventor
Thomas Wrede
Hannes HEIKKILÄ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WREDE KY
Original Assignee
WREDE KY
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from FI833813A external-priority patent/FI833813A0/en
Application filed by WREDE KY filed Critical WREDE KY
Publication of EP0190132A1 publication Critical patent/EP0190132A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10036—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/09—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B32B17/10174—Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B32B17/10293—Edge features, e.g. inserts or holes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
    • B32B17/10761—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing vinyl acetal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0036—Heat treatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
    • F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
    • F24S23/82—Arrangements for concentrating solar-rays for solar heat collectors with reflectors characterised by the material or the construction of the reflector
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/02—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/12—Pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2311/00—Metals, their alloys or their compounds
    • B32B2311/24—Aluminium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2329/00—Polyvinylalcohols, polyvinylethers, polyvinylaldehydes, polyvinylketones or polyvinylketals
    • B32B2329/06—PVB, i.e. polyinylbutyral
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S25/00—Arrangement of stationary mountings or supports for solar heat collector modules
    • F24S25/60—Fixation means, e.g. fasteners, specially adapted for supporting solar heat collector modules
    • F24S2025/601—Fixation means, e.g. fasteners, specially adapted for supporting solar heat collector modules by bonding, e.g. by using adhesives
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers

Definitions

  • the present invention concerns a method in accordance with the preamble of claim 1 for the manufacture of a reflector.
  • Such a concentrating reflector can be used for reflecting solar or other radiation energy a desired direction under conditions in which moisture, air currents, impurities assembled on the face of the apparatus, and radiation detrimental to certain materials, e.g. UV radiation, occur.
  • a reflector shaped as a paraboloid e.g., the radiation energy of the sun can be directed at one point in order to produce the desired concentration effect.
  • an oblong reflector of parabolical section it is possible to concentrate the radiation reflected from the reflector onto a linear area. It should be stated that, e.g., in the U.S.A., about 1,000,000 square metres of reflectors of this type are sold annually.
  • the mirror reflector face can be manufactured in several different ways. Frequently, a smooth-faced base construction of approximately parabolical section is used, onto which a plastic film is attached by means of adhesive-faced materials, the said plastic film being provided with a thin metallic reflector face. Thereby, however, the reflector face is subject to effects of the weather, is oxidated in a relatively short time, and becomes dim. In order to avoid this detrimental phenomenon, many sorts of lacquer-like materials or coatings have been developed, whereby the weather resistance of the reflector face coated by such materials is improved. Thereby, it is often difficult to provide a smooth application of appropriate thickness of the surface layer, for the surface layer has a detrimental effect on the reflecting capacity.
  • the surface layer is also readily damaged if the face is cleaned inappropriately.
  • a method that has been known for a long time is the silver plating of a glass pane in order manufacture a reflector. It is, however, technically more complicated to manufacture a high-quality concave reflector than a plane reflector. It is possible to manufacture a concave reflector by using a metal sheet that has been provided with a mirror face by means of the vacuum evaporating technique, but the face often becomes dim in a short time if there is moisture. A protective coating, on the other hand, deteriorates the mirror reflecting properties.
  • Drawbacks of present-day reflector constructions are their usually poor resistance to weather, difficulty of cleaning without damaging the face, high cost of coated reflector film materials and, consequently, the material and labour cost resulting from the renewal of the reflector face from time to time.
  • the object of the present invention is to eliminate the drawbacks present in the prior-art methods of manufacture and structures and to provide a method of an entirely novel type for the manufacture of a laminated reflector.
  • the invention is based on preparing a reflecting film by means of a technique known from the capacitor film technology as a separate combination film of uniform quality, which film is air-tightly enclosed by means of layers of adhesive material between two support layers by using a lamination technique known from the manufacture of windshields. More specifically, the method in accordance with the invention is mainly characterized in what is stated in the characterizing part of claim 1.
  • Figure 1 is a partly s ⁇ hematical sectional view of the edge portion of a reflector to be manufactured by means of the method of the invention before the compression and heat treatment.
  • Figure 2 shows the edge portion of Fig. 1 after the compression and heat treatment.
  • two layers 3, 4 of adhesive material penetrable by radiation and hardened by heat are fitted, the thickness of each of the said layers being about 0.3 mm.
  • Appropriate adhesive materials are, e.g., polyvinyl- butyral (PVB) and polyvinylalcohol (PVA).
  • a combination film 5,6 is fitted, which consists of a flexible core layer 5 and of a reflecting thin metal layer 6 deposited onto the said core layer.
  • the core layer 5, whose thickness is about 250 ⁇ m, is made of polyester film.
  • the metal layer 6 is preferably made of aluminium which has been deposited onto the core layer in accordance with the capacitor film technique by means of vacuum evaporation. The thickness of this aluminium layer is about 40 nm.
  • the adhesive layers 3, 4 extend somewhat beyond the edge of the combination film 5, 6 so that a groove 11 is formed, whose bottom consists of the outer edge of the combination film 5, 6 and whose walls consist of the outermost parts of the adhesive layers 3, 4.
  • the depth of this groove 11 is appropriately at least 200 ⁇ m.
  • the laminate structure is subjected to infrared heating taking place at a temperature of 80 to 120°C, preferably about 100°C. Then, the laminate is transferred into a pressure autoclave whose processing temperature is 130 to 170° C, preferably about 150oC, pressure 8 to 13 bars, preferably about 10.5 bars, and the time of treatment 35 to 55 min., preferably about 45 min.
  • the adhesive layers 3 and 4 melt partly, whereby their outer edges melt gradually together across the edges of the combination film 5,6, thereby completely enclosing the combination film 5,6 hermetically.
  • the groove 11 disappears completely and a structure in accordance with Fig.
  • PVB polyvinylbutyral
  • a beam 7 of light meets the glass pane 1 at point 8 on the finished reflector, it penetrates through the glass pane 1 and the adhesive layer 3 to point 9, where it is reflected and passes again out through the layers 3 and 1.
  • the face 10 of the glass pane 1 can be cleaned easily, e.g., by means of water, of any dust or dirt gathered on it.
  • the metal coating 6 is well protected, and even the glass pane 1 alone efficiently attenuates the UV radiation, which is so detrimental to the coating 6.
  • the thicknesses of the different layers in a reflector manufactured by means of the method of the invention in the case of the exemplifying embodiment as well as (in brackets) typical limits of variation are given: Glass panes 1 and 2 2.2 mm (1...3 mm) Adhesive layers 3 and 4 0.3 mm (0.1...1.0 mm) Core layer 5 250 ⁇ m (10...500 ⁇ m)
  • the method of the present invention can also be applied easily to structures bent in two directions, for, if required, the adhesive layers 3 and 4 as well as the core layer 5 with the coating 6 can be formed into faces of a permanently unchangeable section, e.g. paraboloid faces or similar faces.

Landscapes

  • Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Laminated Bodies (AREA)
  • Joining Of Glass To Other Materials (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Aerials With Secondary Devices (AREA)

Abstract

Procédé de fabrication d'un réflecteur laminé à face courbe (1-6) qui réfléchit une énergie radiante et en particulier l'énergie solaire. Selon le procédé, une première couche adhésive (4) thermodurcie et que peut pénétrer la radiation, une pellicule de combinaison (5, 6) consistant en une couche centrale flexible (5) et en une couche métallique fine réfléchissante (6) déposée sur ladite couche centrale et une seconde couche adhésive (3) thermodurcie et que peut pénétrer la radiation sont prises en sandwich l'une sur l'autre entre deux couches de support (1, 2) d'une forme courbe désirée de sorte que les bords de la pellicule de combinaison (5, 6) s'étendent au maximum jusqu'au niveau des bords des couches adhésives (3, 4). Le laminé (1-6) ainsi produit est soumis à une compression et à un traitement thermique de sorte que, lorsque la pellicule de combinaison (5, 6) rétrécit jusqu'à une certaine mesure, les couches adhésives (3, 4) fondent ensemble autour des bords de la pellicule de combinaison (5, 6) et enferment complètement la pellicule de combinaison (5, 6) de manière hermétique ce qui, entre autre, améliore sensiblement la résistance aux intempéries du réflecteur.Method of manufacturing a laminated reflector with curved face (1-6) which reflects radiant energy and in particular solar energy. According to the method, a first adhesive layer (4) thermoset and which can penetrate the radiation, a combination film (5, 6) consisting of a flexible central layer (5) and a thin metallic reflective layer (6) deposited on said central layer and a second adhesive layer (3) thermoset and which can penetrate the radiation are sandwiched one on the other between two support layers (1, 2) of a desired curved shape so that the edges of the combination film (5, 6) extend as far as possible up to the edges of the adhesive layers (3, 4). The laminate (1-6) thus produced is subjected to compression and heat treatment so that when the combination film (5, 6) shrinks to a certain extent, the adhesive layers (3, 4) melt together around the edges of the combination film (5, 6) and completely enclose the combination film (5, 6) in an airtight manner which, among other things, significantly improves the weather resistance of the reflector.

Description

Method for the manufacture of a curved face laminated reflector for reflecting ratiation energy and in particular solar energy
The present invention concerns a method in accordance with the preamble of claim 1 for the manufacture of a reflector.
Such a concentrating reflector can be used for reflecting solar or other radiation energy a desired direction under conditions in which moisture, air currents, impurities assembled on the face of the apparatus, and radiation detrimental to certain materials, e.g. UV radiation, occur. By means of a reflector shaped as a paraboloid, e.g., the radiation energy of the sun can be directed at one point in order to produce the desired concentration effect. Correspondingly, as is well known, by means of an oblong reflector of parabolical section, it is possible to concentrate the radiation reflected from the reflector onto a linear area. It should be stated that, e.g., in the U.S.A., about 1,000,000 square metres of reflectors of this type are sold annually.
In the manufacture of concentrating collectors of solar radiation, the mirror reflector face can be manufactured in several different ways. Frequently, a smooth-faced base construction of approximately parabolical section is used, onto which a plastic film is attached by means of adhesive-faced materials, the said plastic film being provided with a thin metallic reflector face. Thereby, however, the reflector face is subject to effects of the weather, is oxidated in a relatively short time, and becomes dim. In order to avoid this detrimental phenomenon, many sorts of lacquer-like materials or coatings have been developed, whereby the weather resistance of the reflector face coated by such materials is improved. Thereby, it is often difficult to provide a smooth application of appropriate thickness of the surface layer, for the surface layer has a detrimental effect on the reflecting capacity. The surface layer is also readily damaged if the face is cleaned inappropriately. A method that has been known for a long time is the silver plating of a glass pane in order manufacture a reflector. It is, however, technically more complicated to manufacture a high-quality concave reflector than a plane reflector. It is possible to manufacture a concave reflector by using a metal sheet that has been provided with a mirror face by means of the vacuum evaporating technique, but the face often becomes dim in a short time if there is moisture. A protective coating, on the other hand, deteriorates the mirror reflecting properties.
Drawbacks of present-day reflector constructions are their usually poor resistance to weather, difficulty of cleaning without damaging the face, high cost of coated reflector film materials and, consequently, the material and labour cost resulting from the renewal of the reflector face from time to time. The object of the present invention is to eliminate the drawbacks present in the prior-art methods of manufacture and structures and to provide a method of an entirely novel type for the manufacture of a laminated reflector.
The invention is based on preparing a reflecting film by means of a technique known from the capacitor film technology as a separate combination film of uniform quality, which film is air-tightly enclosed by means of layers of adhesive material between two support layers by using a lamination technique known from the manufacture of windshields. More specifically, the method in accordance with the invention is mainly characterized in what is stated in the characterizing part of claim 1.
It can be considered the most important advantage of the method of the present invention that the durability of the reflector face and the permanence of the mirror reflecting capacity are increased essentially so that the reflector endures several years of operation and cleaning without any other operations. Moreover, by means of the structure, an excellent stability of form is achieved. In the following, the invention will be examined in more detail with the aid of the exemplifying embodiments in accordance with the attached drawings. Figure 1 is a partly sσhematical sectional view of the edge portion of a reflector to be manufactured by means of the method of the invention before the compression and heat treatment. Figure 2 shows the edge portion of Fig. 1 after the compression and heat treatment.
In the example case, between two at least substantially identical glass panes 1, 2 of parabolical section, two layers 3, 4 of adhesive material penetrable by radiation and hardened by heat are fitted, the thickness of each of the said layers being about 0.3 mm. Appropriate adhesive materials are, e.g., polyvinyl- butyral (PVB) and polyvinylalcohol (PVA). Moreover, between the layers 3, 4 of adhesive material, a combination film 5,6 is fitted, which consists of a flexible core layer 5 and of a reflecting thin metal layer 6 deposited onto the said core layer. The core layer 5, whose thickness is about 250 μm, is made of polyester film. The metal layer 6 is preferably made of aluminium which has been deposited onto the core layer in accordance with the capacitor film technique by means of vacuum evaporation. The thickness of this aluminium layer is about 40 nm.
Out of the combination film prepared in this way, a piece is cut off which is dimensioned so that its edges extend at the maximum to the level of the edges of the layers 3 , 4 of adhesive material. In the example case, shown in Fig. 1, the adhesive layers 3, 4 extend somewhat beyond the edge of the combination film 5, 6 so that a groove 11 is formed, whose bottom consists of the outer edge of the combination film 5, 6 and whose walls consist of the outermost parts of the adhesive layers 3, 4. The depth of this groove 11 is appropriately at least 200 μm. The combination in this way produced is then brought into a compression treatment known from the windshield technology by subjecting the edge zone between the support layers 1, 2 to a negative pressure so that the support layers 1, 2 are pressed against each other for the removal of any excess air.
Hereupon, the laminate structure is subjected to infrared heating taking place at a temperature of 80 to 120°C, preferably about 100°C. Then, the laminate is transferred into a pressure autoclave whose processing temperature is 130 to 170° C, preferably about 150ºC, pressure 8 to 13 bars, preferably about 10.5 bars, and the time of treatment 35 to 55 min., preferably about 45 min. On being heated, the adhesive layers 3 and 4 melt partly, whereby their outer edges melt gradually together across the edges of the combination film 5,6, thereby completely enclosing the combination film 5,6 hermetically. Thus, thereby the groove 11 disappears completely and a structure in accordance with Fig. 2 is produced, wherein the adhesive layers 3 and 4 form a unified edge face 12 connecting the support layers 1 and 2 at their edges. Since the combination film 5, 6 shrinks to some extent during the heat treatment, a groove 11 shown in Fig. 1 is in itself not necessarily needed, but the combination film 5, 6 may extend substantially to the outer edges of the adhesive layers 3, 4. Owing to the said shrinkage, a result in accordance with Fig. 2 is also obtained in this case. The shrinkage does, however, not deteriorate the reflecting quality of the reflecting metal layer 6 excessively.
As the layers 3 and 4 , it is highly advantageously possible to use polyvinylbutyral (PVB), because it is also used advantageously in other laminate structures, e.g., in the manufacture of windshields for automobiles.
When a beam 7 of light meets the glass pane 1 at point 8 on the finished reflector, it penetrates through the glass pane 1 and the adhesive layer 3 to point 9, where it is reflected and passes again out through the layers 3 and 1. The face 10 of the glass pane 1 can be cleaned easily, e.g., by means of water, of any dust or dirt gathered on it. On the other hand, the metal coating 6 is well protected, and even the glass pane 1 alone efficiently attenuates the UV radiation, which is so detrimental to the coating 6.
In the following, in a condensed form, the thicknesses of the different layers in a reflector manufactured by means of the method of the invention in the case of the exemplifying embodiment as well as (in brackets) typical limits of variation are given: Glass panes 1 and 2 2.2 mm (1...3 mm) Adhesive layers 3 and 4 0.3 mm (0.1...1.0 mm) Core layer 5 250 μm (10...500 μm)
Coating layer 6 40 nm (20...60 nm)
The importance of the core layer 5 lies therein that the coating layer 6 can be formed readily onto the core layer.
It should be noticed that the method of the present invention can also be applied easily to structures bent in two directions, for, if required, the adhesive layers 3 and 4 as well as the core layer 5 with the coating 6 can be formed into faces of a permanently unchangeable section, e.g. paraboloid faces or similar faces.

Claims

WHAT IS CLAIMED IS:
1.. Method for the manufacture of a curved face laminated reflector (1 to 6) for reflecting radiation energy and in particular solar energy, according to which method a reflecting layer (6), e.g. an, aluminium layer, is produced between two support layers (1, 2), e.g., glass layers, penetrable by radiation, and - the support layers (1, 2) are connected together so that the reflecting layer (6) remains between the support layers, c h a r a c t e r i z e d, in that
- a first adhesive layer (4) penetrable by radiation and hardened by heat, a combination film (5, 6) consisting of a flexible core layer (5) and of a reflecting thin metal layer (6) deposited onto the said core layer, and a second adhesive layer (3) penetrable by radiation and hardened by heat are sandwiched, one upon the other, between the two support layers (1, 2) of the desired curved form so that the edges of the combination film (5, 6) extend at the maximum to the level of the edges of the adhesive layers (3, 4), and - the laminate (1 to 6) produced in this way is subjected to a compression and heat treatment so that, when the combination film (5, 6) shrinks to some extent, the adhesive layers (3, 4) melt together around the edges of the combination film (5, 6) and completely enclose the combination film (5, 6) in a hermetical manner.
2. Method as claimed in claim 1, c h a r a c t e r i z e d in that the compression treatment is performed by subjecting the edge zone between the support layers (1, 2) to a negative pressure so that the support layers (1, 2) are pressed against each other for the removal of any excess air.
3. Method as claimed in claim 1, c h a r a c t e r i z e d in that the heat treatment comprises an infrared heating taking place at a temperature of
80 to 120°C, preferably about 100°C, and a subsequent autoclave heating taking place at a temperature of 130 to 170°C, preferably about 150°C.
4. Method as claimed in claim 3, c h a r a c t e r i z e d in that the autoclave heating is performed at a pressure of 8 to 13 bars, preferably about 10.5 bars, and its duration is 35 to 55 min., preferably about 45 min.
5. Method as claimed in claim 1, c h a r a c t e r i z e d in that the adhesive layers (3, 4) are made of polyvinylbutyral (PVB) or polyvinylalcohol (PVA).
6. Method as claimed in claim 1, c h a r a c t e r i z e d in that the combination film (5, 6) is prepared by depositing onto the core layer (5), in accordance with the capacitor film technique by means of vacuum evaporation, a thin metal layer (6), e.g., an aluminium layer, whose thickness is 20 to 60 nm, preferably about 40 nm.
7. Method as claimed in claim 6, c h a r a c t e r i z e d in that, as the core layer (5), a polyester film is used, whose thickness is 10 to 500 μm, preferably about 250 μm.
8. Method as claimed in claim 1, c h a r a c t e r i z e d in that the compression and heat treatment is carried out in a pressure autoclave known from the windshield technology.
9. Method as claimed in claim 1, c h a r a c t e r i z e d in that the combination film. (5, 6) is originally dimensioned so that, when it is sandwiched between the support layers (1, 2) before the compression and heat treatment, the edges of the adhesive layer (3, 4) go beyond the edges of the combination film (5, 6) at every point by at least 200 μm.
EP84903635A 1983-10-19 1984-09-10 Method for the manufacture of a curved face laminated reflector for reflecting radiation energy and in particular solar energy Withdrawn EP0190132A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FI833813 1983-10-19
FI833813A FI833813A0 (en) 1983-10-19 1983-10-19 LAMINERAD SPEGEL
FI834652 1983-12-16
FI834652A FI834652A (en) 1983-10-19 1983-12-16 LAMINERAD SPEGEL.

Publications (1)

Publication Number Publication Date
EP0190132A1 true EP0190132A1 (en) 1986-08-13

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EP84903635A Withdrawn EP0190132A1 (en) 1983-10-19 1984-09-10 Method for the manufacture of a curved face laminated reflector for reflecting radiation energy and in particular solar energy

Country Status (5)

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EP (1) EP0190132A1 (en)
AU (1) AU3501584A (en)
BR (1) BR8407352A (en)
FI (1) FI834652A (en)
WO (1) WO1985001725A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4600627A (en) * 1984-04-24 1986-07-15 Bridgstone Corporation Sandwich glasses
DE19622566C1 (en) * 1996-06-05 1997-11-20 Sekurit Saint Gobain Deutsch Method for producing an IR-reflective laminated glass pane for motor vehicles
FR2762541B1 (en) 1997-04-24 1999-07-02 Saint Gobain Vitrage PROCESS FOR PRODUCING LAMINATED GLAZING
JP2000091485A (en) * 1998-07-14 2000-03-31 Denso Corp Semiconductor device
DE60110548T2 (en) * 2000-01-13 2006-02-23 Pilkington Italia S.P.A. COMPOSITE GLASS
DE10022409C1 (en) * 2000-05-09 2002-04-04 Saint Gobain Sekurit D Gmbh Process for producing a composite pane with a transparent, corrosion-protected surface coating and composite pane
EP2354716A1 (en) * 2010-02-03 2011-08-10 Kuraray Europe GmbH Mirror for solar thermal power plants containing polyvinyl acetal films containing softeners
WO2013051999A1 (en) * 2011-10-07 2013-04-11 Carbonia Composites Ab Sandwich structure unit for solar collector mirrors

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1653040A (en) * 1926-04-30 1927-12-20 Libbey Owens Sheet Glass Co Mirror
GB1432034A (en) * 1973-09-07 1976-04-14 Sierracin Corp Edge improvement for window with electrically conductive layer
FR2364120A1 (en) * 1976-09-14 1978-04-07 Cellophane Sa METHOD OF MANUFACTURING A COMPLEX MATERIAL HAVING THE APPEARANCE OF A MIRROR AND PRODUCTS OBTAINED BY THIS PROCESS

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8501725A1 *

Also Published As

Publication number Publication date
BR8407352A (en) 1986-09-23
FI834652A0 (en) 1983-12-16
FI834652A (en) 1985-04-20
WO1985001725A1 (en) 1985-04-25
AU3501584A (en) 1985-05-07

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