# US 10,246,363 B2 · Textured glass for greenhouses

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- Number: US 10,246,363 B2
- Document ID: US10246363B2
- Status: Granted
- Kind: B2
- Application number: 15/568,261
- Filed: 2016-04-19
- Published: 2018-05-24
- Granted: 2019-04-02
- Earliest claimed: 2015-04-23
- Assignees: Saint-Gobain Glass France
- Applicants: Saint-Gobain Glass France
- Inventors: Michele Schiavoni; Mathieu Berard; Emmanuel Mimoun; Simon Mazoyer
- Web page: https://patentgrep.com/patent/US10246363B2

## CPC

- C03B 13/08: Rolling patterned sheets {, e.g. sheets having a surface pattern}
- A01G 9/1438: {Covering materials therefor; Materials for protective coverings used for soil and plants, e.g. films, canopies, tunnels or cloches}
- A01G 9/243: {Collecting solar energy (in general F24S)}
- C03C 19/00: Surface treatment of glass, not in the form of fibres or filaments, by mechanical means (sand-blasting, grinding, or polishing glass B24)
- C03C 23/00: Other surface treatment of glass not in the form of fibres or filaments
- G02B 5/021: {the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures}
- G02B 5/0231: {the surface having microprismatic or micropyramidal shape (macroscopic prism arrays G02B5/045)}
- G02B 5/045: {Prism arrays}
- F24S 80/50: Elements for transmitting incoming solar rays and preventing outgoing heat radiation; Transparent coverings
- F24S 80/56: characterised by means for preventing heat loss
- F24S 2080/501: {Special shape}
- Y02A 40/25: Greenhouse technology, e.g. cooling systems therefor
- Y02P 60/12: using renewable energies, e.g. solar water pumping
- C03B: MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- A01G: HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING (picking of fruits, vegetables, hops or the like A01D46/00; propagating unicellular algae C12N1/12)
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- F24S: SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS (for producing mechanical power from solar energy F03G6/00)
- Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A transparent sheet includes a texture in relief on a first of its main faces, such that, if n is the refractive index of the material including the texture, Pm is the mean slope in degrees of the textured face and Y(q) is the percentage of the textured surface with a slope greater than q/(n−1) in degrees, then the two cumulative conditions exist: Y(q)>3%+f(q) %*Pm*(n−1) and Y(q)>10%, with f(q)=24−(3*q) and q=2 or 3.

## Claims

### Claim 1

A transparent sheet comprising a texture in relief on a first main face of its main faces to form a textured face, such that, if n is the refractive index of a material comprising the texture, Pm is the mean slope in degrees of the textured face and Y(q) is the percentage of the textured surface with a slope greater than q/(n−1) in degrees, then the two cumulative conditions exist:
Y(q)>3%+f(q)%*Pm*(n−1)
and Y(q)>10%
with f(q)=24−(3*q)
and q=2 or 3.

### Claim 2 (depends on 1)

The sheet as claimed in claim 1, wherein Y(q)>5%+f(q) %*Pm*(n−1).

### Claim 3 (depends on 2)

The sheet as claimed in claim 2, wherein Y(q)>10%+f(q) %*Pm*(n−1).

### Claim 4 (depends on 1)

The sheet as claimed in claim 1, wherein f(q)=27−(3*q), indeed even f(q)=30−(3*q).

### Claim 5 (depends on 1)

The sheet as claimed in claim 1, wherein q=2.

### Claim 6 (depends on 1)

The sheet as claimed in claim 1, wherein q=3.

### Claim 7 (depends on 1)

The sheet as claimed in claim 1, wherein one of the following combinations exists:
Y(q)>5%+f(q)%*Pm*(n−1) with f(q)=27−(3*q) and q=2; or
Y(q)>5%+f(q)%Pm*(n−1) with f(q)=27−(3*q) and q=3; or
Y(q)>5%+f(q)%*Pm*(n−1) with f(q)=30−(3*q) and q=2; or
Y(q)>5%+f(q)%*Pm*(n−1) with f(q)=30−(3*q) and q=3; or
Y(q)>10%+f(q)%*Pm*(n−1) with f(q)=27−(3*q) and q=2; or
Y(q)>10%+f(q)%*Pm*(n−1) with f(q)=27−(3*q) and q=3; or
Y(q)>10%+f(q)%*Pm*(n−1) with f(q)=30−(3*q) and q=2; or
Y(q)>10%+f(q)%*Pm*(n−1) with f(q)=30−(3*q) and q=3.

### Claim 8 (depends on 1)

The sheet as claimed in claim 1, wherein the refractive index of the material comprising the texture is within the range extending from 1.4 to 1.65 at 587 nm.

### Claim 9 (depends on 1)

The sheet as claimed in claim 1, wherein the absorption of the sheet in the spectral range within the range extending from 400 to 700 nm is less than 2%.

### Claim 10 (depends on 1)

The sheet as claimed in claim 1, wherein the material comprising the texture is made of mineral glass.

### Claim 11 (depends on 1)

The sheet as claimed in claim 1, wherein the roughness of the textured surface is such that the mean RSm is greater than 1 mm and less than 8 mm.

### Claim 12 (depends on 1)

The sheet as claimed in claim 1, wherein the texture comprises contiguous patterns with a size within the range extending from 2 to 8 mm.

### Claim 13 (depends on 1)

The sheet as claimed in claim 1, wherein its second main face also exhibits a texture such that Pm*(n−1) is greater than Pm′*(n′−1), Pm′ representing the mean slope of the second main face and n′ being the refractive index of the material comprising the texture of the second main face.

### Claim 14 (depends on 13)

The sheet as claimed in claim 13, wherein the texture of the second main face has a mean slope such that Pm′*2*(n′−1) is less than 3°.

### Claim 15 (depends on 13)

The sheet as claimed in claim 13, wherein, if Y′(q) is the percentage of the textured surface with a slope greater than q/(n′−1) in degrees of the second main face, then there exists the relationship:
Y′(q)>3%+f(q)%*Pm′*(n′−1)
with f(q)=24−(3*q) and
q having the value 2 both for Y(q) and for Y′(q), or q having the value 3 both for Y(q) and for Y′(q).

### Claim 16 (depends on 1)

The sheet as claimed in claim 1, further comprising an antireflective coating on one or on its main faces.

### Claim 17 (depends on 1)

A horticultural greenhouse equipped with a sheet of claim 1.

### Claim 18 (depends on 1)

A process for the manufacture of a sheet of claim 1, the process comprising rolling the sheet with a textured engraved roll.

### Claim 19 (depends on 18)

The process as claimed in claim 18, wherein the textured engraved roll supports patterns having a mean slope greater than the mean slope of the first main face of the sheet obtained.

### Claim 20 (depends on 19)

The process as claimed in claim 19, wherein the textured engraved roll supports patterns having a mean slope greater by at least 0.5° than the mean slope of the first main face of the sheet obtained.

### Claim 21 (depends on 20)

The process as claimed in claim 20, wherein the textured engraved roll supports patterns having a mean slope greater by at least 1° than the mean slope of the first main face of the sheet obtained.

### Claim 22 (depends on 9)

The sheet as claimed in claim 9, wherein the absorption of the sheet in the spectral range within the range extending from 400 to 700 nm is less than 1%.

### Claim 23 (depends on 22)

The sheet as claimed in claim 22, wherein the absorption of the sheet in the spectral range within the range extending from 400 to 700 nm is less than 0.5%.

### Claim 24 (depends on 11)

The sheet as claimed in claim 11, wherein the roughness of the textured surface is such that the mean RSm is greater than 1.5 mm.

### Claim 25 (depends on 24)

The sheet as claimed in claim 24, wherein the roughness of the textured surface is such that the mean RSm is greater than 2 mm.

### Claim 26 (depends on 14)

The sheet as claimed in claim 14, wherein the texture of the second main face has a mean slope such that Pm′*2*(n′−1) is less than 2°.