Method of manufacturing glass film

Patent metadata

Field	Value
Publication number	US-12325656-B2
Application number	US-202017631956-A
Country	US
Kind code	B2
Filing date	Jul 31, 2020
Priority date	Aug 5, 2019
Publication date	Jun 10, 2025
Grant date	Jun 10, 2025

Abstract

A method of manufacturing a glass film using a roll-to-roll process in which a long glass film from a feed roll is wound on a winding roll through a plurality of steps, the plurality of steps comprising: a step of cutting the glass film along a feed direction at a predetermined position in a width direction; and a step of polishing cutting surfaces of glass films into which the glass film is cut.

First claim

What is claimed is:

1. A method of manufacturing a glass film using a roll-to-roll process in which a long glass film from a feed roll is wound on a plurality of winding rolls through a plurality of steps, the plurality of steps comprising:
a step of cutting the glass film along a feed direction at a predetermined position in a width direction into a first cut glass film and a second cut glass film;
a step of cleansing the first cut glass film and the second cut glass film;
a step of polishing cutting surfaces of the first cut glass film and cutting surfaces of the second cut glass film after the step of cleansing; and
a step of respectively winding the first cut glass film and the second cut glass film on a first winding roll and a second winding roll of the plurality of winding rolls, wherein the first winding roll is different from the second winding roll;
wherein the first cut glass film and the second cut glass film are respectively conveyed via a first path and a second path in a cleansing tank configured to perform the step of cleansing, and a height of the first path is different from a height of the second path; and
wherein a slit is formed between the first cut glass film and the second cut glass film, and a width of the slit is controlled during the step of polishing before respectively conveying the first cut glass film and the second cut glass film via the first path and the second path.

2. The method of manufacturing the glass film according to claim 1 ,
wherein a distance between a cutting start position of the glass film and a polishing start position of the first cut glass film and the second cut glass film is 0.5 m or more.

3. The method of manufacturing the glass film according to claim 1 , wherein a distance between a cutting start position of the glass film and a cleansing start position of the first cut glass film and the second cut glass film is 0.5 m or more.

4. The method of manufacturing the glass film according to claim 1 , wherein chemical polishing is used in the polishing step.

5. The method of manufacturing the glass film according to claim 4 , wherein a polishing solution containing hydrofluoric acid is used in the chemical polishing.

6. The method of manufacturing the glass film according to claim 1 , wherein a reinforcement is provided linearly along a longitudinal direction of the glass film near both ends of the glass film in the width direction on one side of the glass film, and areas provided with the reinforcement are removed in the cutting step.

7. The method of manufacturing the glass film according to claim 1 , wherein the thickness of the glass film is greater than or equal to 30 μm and less than or equal to 150 μm.

Assignees

• Nitto Denko Corp

Inventors

• Murashige Takeshi
• Koshio Satoru

Classifications

• C03C15/02

  for making a smooth surface · CPC title

• C03B33/091 Primary

  using at least one focussed radiation beam, e.g. laser beam (C03B33/0955 takes precedence) · CPC title

• B24B41/053

  for grinding or polishing glass {(B24B41/0475 takes precedence)} · CPC title

• B24B7/242

  for plate glass · CPC title

• B24B1/00

  Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes · CPC title