Method of making reflector for solar collector or the like and corresponding product

• US 20070221313A1
• Filed: 05/03/2006
• Published: 09/27/2007
• Est. Priority Date: 03/23/2006
• Status: Abandoned Application

• Current Assignee: Guardian Europe S.A.R.L.. (Interguard Holding Corp.)
• Original Assignee: Centre Luxembourgeois de Recherches pour le Verre et la Ceramique SA
• Inventors: Sol, Jean-Marc, Franck, Pierre-Yves
• Application Number:
  US11/416,388
• Publication Number:
  US 20070221313A1
• Time in Patent Office: Days
• US Class Current: 156/91
• CPC Class Codes: B32B 17/10036 comprising two outer glass sheets
• CPC Class Codes: B32B 17/10174 Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
• CPC Class Codes: B32B 17/10761 containing vinyl acetal
• CPC Class Codes: B32B 17/10889 shaping the sheets, e.g. by using a mould B32B17/10816 takes precedence
• CPC Class Codes: F24S 23/71 with parabolic reflective surfaces with cylindro-parabolic reflective surfaces F24S23/74
• CPC Class Codes: F24S 23/72 with hemispherical reflective surfaces
• CPC Class Codes: F24S 23/74 with trough-shaped or cylindro-parabolic reflective surfaces
• CPC Class Codes: F24S 23/82 characterised by the material or the construction of the reflector
• CPC Class Codes: Y02E 10/40 Solar thermal energy, e.g. solar towers
• CPC Class Codes: Y10T 156/1028 by bending, drawing or stretch forming sheet to assume shape of configured lamina while in contact therewith
• CPC Class Codes: Y10T 156/1031 with preshaping of lamina

Abstract

A reflector (e.g., mirror) for use in a solar collector or the like is provided. In certain example embodiments of this invention, a reflector is made performing at least the following steps: (a) forming a reflective coating on a flat glass substrate, (b) cold-bending the glass substrate with the reflective coating thereon; and (c) applying a plate or frame member (e.g., another glass sheet/substrate, or alternatively a thermoplastic member) to the cold-bent glass substrate, the plate or frame member for maintaining the coated glass substrate in a desired bent orientation. In certain example embodiments, the glass substrate supporting the reflective coating may be maintained in desired bent form by using another glass substrate and a glue layer provided between the another glass substrate and the glass substrate supporting the coating. The bent reflector (e.g., mirror) may be used in a solar collector, or in any other suitable application.

Claims

1. A method of making a mirror, the method comprising:

providing a flat glass substrate;

forming a reflective coating on the flat glass substrate;

after the reflective coating has been formed on the flat glass substrate, bending the glass substrate together with the coating thereon into a desired bent shape, the bending being performed when the glass substrate is at a temperature of no more than about 200 degrees C.; and

maintaining the glass substrate and the coating thereon in substantially the desired bent shape by using a pre-bent glass sheet and/or a thermoplastic member that is attached to the glass substrate and/or the coating thereon.

2. The method of claim 1, wherein said bending of the glass substrate with the coating thereon is performed when the glass substrate is at a temperature of no more than about 150 degrees C.

3. The method of claim 1, wherein said bending of the glass substrate with the coating thereon is performed when the glass substrate is at a temperature of no more than about 100 degrees C.

4. The method of claim 1, wherein said bending of the glass substrate with the coating thereon is performed when the glass substrate is at a temperature of no more than about 50 degrees C.

5. The method of claim 1, wherein said bending of the glass substrate with the coating thereon is performed when the glass substrate is at approximately room temperature.

6. The method of claim 1, comprising maintaining the glass substrate and the coating thereon in substantially the desired bent shape by using the thermoplastic member that is attached to the glass substrate and/or the coating thereon,

wherein the thermoplastic member is attached to the glass substrate via one or both of:

(a) an adhesive provided between the coating and the thermoplastic member, and/or (b) a plurality of fasteners, and

wherein the thermoplastic member is attached to the glass substrate and/or coating before or after the glass substrate has been bent.

7. The method of claim 6, wherein the thermoplastic member is attached to the glass substrate and/or coating after the glass substrate has been bent.

8. The method of claim 1, wherein the glass substrate is from about 1.0 to 2.25 mm thick.

9. The method of claim 1, comprising maintaining the glass substrate and the coating thereon in substantially the desired bent shape by using the pre-bent glass sheet that is attached to the glass substrate and/or the coating thereon.

10. The method of claim 9, wherein the pre-bent glass sheet is hot-bent before being attached to the glass substrate and/or coating.

11. The method of claim 1, wherein the coating comprises at least one reflective layer comprising Al, Ag and/or Cr.

12. The method of claim 1, wherein the bent shape comprises a substantially parabolic shape, and wherein the mirror is used as a mirror in a solar collector.

13. A method of making a reflector, the method comprising:

providing a flat glass substrate;

forming a reflective coating on the flat glass substrate, the reflective coating for reflecting visible and/or IR radiation and comprising at least one reflective layer comprising one or more of Ag, Al and/or Cr;

after the reflective coating has been formed on the flat glass substrate, bending the glass substrate together with the coating thereon into a desired bent shape, the bending being performed when the glass substrate is at a temperature of no more than about 200 degrees C.; and

maintaining the glass substrate and the coating thereon in substantially the desired bent shape by using a frame member.

14. The method of claim 13, wherein said bending is performed when the glass substrate is at a temperature of no more than about 150 degrees C.

15. The method of claim 13, wherein said bending is performed when the glass substrate is at a temperature of no more than about 100 degrees C.

16. The method of claim 13, wherein said bending is performed when the glass substrate is at a temperature of no more than about 50 degrees C.

17. The method of claim 13, wherein said bending is performed when the glass substrate is at approximately room temperature.

18. The method of claim 13, wherein the frame member comprises one of:

(1) a thermoplastic member that is attached to the glass substrate via one or both of;

(a) an adhesive provided between the coating and the thermoplastic member, and/or (b) a plurality of fasteners, or (2) another glass substrate with a glue layer being provided between the another glass substrate and the glass substrate supporting the reflective coating.

19. The method of claim 13, wherein the frame member comprises a pre-bent glass sheet that has been hot bent prior to being laminated to the glass substrate and/or coating.

20. The method of claim 13, wherein the reflector is used as a vehicle window or as a mirror in a solar collector.

21. The method of claim 13, wherein the glass substrate is from 1.0 to 2.25 mm thick.

22. A mirror comprising:

a bent glass substrate;

a mirror coating on the bent glass substrate, the mirror coating for reflecting visible light and comprising at least one reflective layer comprising one or more of Ag, Al and/or Cr;

wherein the bent glass substrate with the mirror coating thereon is maintained in a desired bent shape by a frame member, so that if the frame member were removed then the glass substrate would no longer be in the desired bent shape, and wherein the frame member comprises one of;

(1) a thermoplastic member, or (2) another glass substrate with a glue layer being provided between the another glass substrate and the bent glass substrate supporting the mirror coating.

23. The mirror of claim 22, wherein the frame member comprises a pre-bent glass substrate that is hot-bent prior to being laminated to the bent glass substrate.

24. A method of making a coated article, the method comprising:

providing a flat glass substrate;

forming a reflective coating on the flat glass substrate;

after the reflective coating has been formed on the flat glass substrate, bending the glass substrate together with the coating thereon into a desired bent shape, the bending being performed when the glass substrate is at a temperature of no more than about 200 degrees C.; and

maintaining the glass substrate and the reflective coating thereon in substantially the desired bent shape by using another glass substrate and a glue layer, wherein the glue layer is provided between the glass substrate that supports the reflective coating and the another glass substrate.

25. The method of claim 24, wherein said bending is performed when the glass substrate is at a temperature of no more than about 150 degrees C.

26. The method of claim 24, wherein said bending is performed when the glass substrate is at a temperature of no more than about 100 degrees C.

27. The method of claim 24, wherein glue layer comprises polyvinyl butyral.

28. The method of claim 24, wherein the glass substrate supporting the reflective coating is from about 1.0 to 2.25 mm thick.