Patent ID: 8935942
Filing Date: 2015-01-20
Classification: C03B

Abstract:
1. A process for manufacturing of a glass film, comprising: forming molten glass or a glass base material into a glass film ribbon; wherein a thickness of the glass film ribbon is set as 300 μm or less at a center portion in the width direction of the glass film ribbon, winding, into a roll shape, the glass film ribbon, which is drawn downward while being cooled; and cutting the glass film ribbon, along a width direction of the glass film ribbon, at a glass film ribbon cutting position before being wound, wherein an annealing region is provided below a glass film ribbon forming start position, a cooling region is provided below the annealing region, and a direction changing region is provided below the cooling region such that a drawing direction of the glass film ribbon changes from a vertical direction to a horizontal direction in the direction changing region, wherein the glass film ribbon cutting position is arranged such that the cutting of the glass film ribbon is performed after the drawing direction is changed in the direction changing wherein a vertical distance from the glass film ribbon forming start position to the glass film ribbon cutting position is set as five times or more of a dimension in the width direction of the glass film ribbon, and wherein a vertical length of the annealing region positioned below the glass film ribbon forming start position is set to 50% or more and 80% or less of the vertical distance from the glass film ribbon forming start position to the glass film ribbon cutting position.