Glass film laminate
A glass film laminate includes a glass film and a supporting glass. The glass film and the supporting glass have surfaces in contact with each other, and each of the surfaces has a surface roughness Ra of 2.0 nm or less.
1. A glass film laminate comprising:
a glass film made of silicate glass and formed by an overflow down-draw method; and
a supporting glass made of silicate glass and formed by an overflow down-draw method, wherein
a surface of the glass film and a surface of the supporting glass, which are in contact with each other, are fire-polished surfaces and have a surface roughness Ra of 2.0 nm or less, respectively, and
the glass film and the supporting glass are peelably laminated on each other without an adhesive by a direct contact between the surface of the glass film and the surface of the supporting glass.
2. The glass film laminate according to claim 1 , wherein the surface of the glass film and the surface of the supporting glass have a GI value of 1000 pcs/m 2 or less respectively.
3. The glass film laminate according to claim 1 , wherein the glass film has a thickness of 300 μm or less.
4. The glass film laminate according to claim 1 , wherein the supporting glass has a thickness of 400 μm or more.
5. The glass film laminate according to claim 1 , wherein a difference of thermal expansion coefficients between the glass film and the supporting glass at 30 to 380° C. is 5×10 −7 /° C. or less.
6. The glass film laminate according to claim 1 , wherein the glass film and the supporting glass are laminated so that at least a part of an edge portion of the glass film laminate includes a step.
7. The glass film laminate according to claim 1 , further comprising a peeling sheet member interposed at a partial region of a contact portion between the glass film and the supporting glass, the peeling sheet member partially protruding from the contact portion.
8. The glass film laminate according to claim 1 , wherein the supporting glass includes at least one through-hole formed at a position in the vicinity of one of four corners of the glass film.
9. The glass film laminate according to claim 1 , further comprising a guide member for positioning the glass film on the supporting glass at a glass film side.
10. The glass film laminate according to claim 9 , wherein the guide member has a smaller thickness than the glass film.
11. The glass film laminate according to claim 2 , wherein the glass film has a thickness of 300 μm or less.
12. The glass film laminate according to claim 2 , wherein the supporting glass has a thickness of 400 μm or more.
13. The glass film laminate according to claim 2 , wherein a difference of thermal expansion coefficients between the glass film and the supporting glass at 30 to 380° C. is 5×10 −7 /° C. or less.
14. The glass film laminate according to claim 2 , wherein the glass film and the supporting glass are laminated so that at least a part of an edge portion of the glass film laminate includes a step.
15. The glass film laminate according to claim 2 , further comprising a peeling sheet member interposed at a partial region of a contact portion between the glass film and the supporting glass, the peeling sheet member partially protruding from the contact portion.
16. The glass film laminate according to claim 2 , wherein the supporting glass includes at least one through-hole formed at a position in the vicinity of one of four corners of the glass film.
17. The glass film laminate according to claim 2 , further comprising a guide member for positioning the glass film on the supporting glass at a glass film side.