| 摘要 |
<p>The present invention relates to a method for manufacturing an ultra-thin glass substrate, the method including: a feeding step of feeding a preform for a glass substrate to a production line while being held; a heating step of heating the preform fed from the feeding step to a temperature around a softening point thereof; and a drawing step of drawing the preform that has softened in the heating step to form an ultra-thin glass substrate, in which the preform has been wound on a cylindrical first winding roll having a roll diameter of 100 mm to 1,500 mm and has a thickness Tp of 20 µm to 250 µm, a width Wp of 10 mm to 2,000 mm, and a length of 1 m to 5,000 m, the ultra-thin glass substrate produced by the drawing step has a thickness Tg of 2 µm to 50 µm, a width Wg of 0.3 mm to 500 mm, and a length of 5 m to 500,000 m, and when a thickness-direction reduction ratio and a width-direction reduction ratio in which the preform is drawn in the drawing step are expressed by Tg/Tp and Wg/Wp, respectively, then the Tg/Tp is from 1/125 to 1/2 and the Wg/Wp is from 1/125 to 1.</p> |
