Glass roll, device for producing glass roll, and process for producing glass roll
A glass roll reliably prevents a glass film from breaking from an end surface of the glass film as an origin of breakage. The glass roll is formed by winding the glass film into a roll while superposing the glass film on a protective sheet. The glass film is formed by an overflow downdraw method to have a thickness of 1 μm or more and 200 μm or less, and has each end surface in a width direction formed as a cut surface cut by laser splitting.
1. A glass roll comprising:
a protective sheet and
a glass film in contact with the protective sheet,
wherein the glass film and the protective sheet are wound into a roll in a superimposed state,
wherein the glass film has a thickness of 1 μm or more and 200 μm or less,
wherein the glass film has laser cut end surfaces in a width direction of the glass film,
wherein the laser cut end surfaces are in contact with the protective sheet,
wherein the laser cut end surfaces each have an arithmetic average roughness Ra of 0.1 μm or less,
wherein the glass film is made from non-alkali glass, and
wherein the protective sheet is a solid body and separable from the glass film in a sheet state.
2. The glass roll according to claim 1 , wherein the glass film has unpolished front and back surfaces.
3. The glass roll according to claim 1 , wherein the glass film is an overflow downdraw glass film or a redraw glass film.
4. The glass roll according to claim 1 , wherein the glass film has laser split end surfaces in the width direction of the glass film.
5. The glass roll according to claim 1 , further comprising a resin film that is a body separate from the protective sheet,
wherein the resin film is on the glass film at end portions in the width direction in a region within 1 to 2 cm from each of the laser cut end surfaces in the width direction of the glass film.
6. The glass roll according to claim 1 , further comprising a resin film that is a body separate from the protective sheet,
wherein the resin film and the glass film adhere to each other.
7. The glass roll according to claim 1 , further comprising a resin film that is a body separate from the protective sheet,
wherein the glass film protected by the resin film and the protective sheet are wound into the roll in a superimposed state.
8. A glass roll package body comprising:
a glass roll according to claim 1 ; and
a package container housing the glass roll therein, the package container covering the glass roll in its entirety.
9. The glass roll package body according to claim 8 , wherein the package container has clean gas therein.
10. The glass roll package body according to claim 8 , wherein the package container houses a desiccant therein.
11. A glass roll package body comprising:
a glass roll according to claim 5 ; and
a package container housing the glass roll therein, the package container covering the glass roll in its entirety.
12. The glass roll package body according to claim 11 , wherein the package container has clean gas therein.
13. The glass roll package body according to claim 11 , wherein the package container houses a desiccant therein.
14. A glass roll package body comprising:
a glass roll according to claim 6 ; and
a package container housing the glass roll therein, the package container covering the glass roll in its entirety.
15. The glass roll package body according to claim 14 , wherein the package container has clean gas therein.
16. The glass roll package body according to claim 14 , wherein the package container houses a desiccant therein.
17. A glass roll package body comprising:
a glass roll according to claim 7 : and
a package container housing the glass roll therein, the package container covering the glass roll in its entirety.
18. The glass roll according to claim 1 , wherein the protective sheet and the glass film do not adhere to each other.
19. The glass roll according to claim 1 , wherein the protective sheet is one of a resin film, paper, and a non-woven fabric.
20. The glass roll according to claim 1 , wherein the protective sheet is peelable from the glass film.