Method for making glass plate by floating method

A manufacturing method and glass plate technology, which are applied in the field of upper rolls of glass ribbons, can solve the problems of difficult upper roll processing, glass belt tooth defects, and carbon upper rolls that cannot apply sufficient pressing force and tension, so as to improve adhesion, Reduce deformation, reduce the effect of fluctuation

Inactive Publication Date: 2012-05-02
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In addition, since carbon materials are more brittle than metal materials, it is difficult to process the teeth and grooves on the front end of the upper roll itself.
In addition, there is a problem that tooth chipping is likely to occur due to local fluctuations in the viscosity of the glass ribbon, etc.
In addition, in glass sheets that need to be thinned, such as glass for plasma displays and TFT panels, it is particularly necessary to apply a pressing force to both ends of the upper roll in the width direction perpendicular to the direction of travel of the glass ribbon, and to apply pressure to the upper roll. Tension is applied in a direction substantially perpendicular to the direction of travel of the glass ribbon. Due to the brittleness of the teeth and grooves, and the fragility of the joint between the tip of the roll and the rotating shaft, etc., there is a carbon upper roll that cannot apply sufficient pressing force. and tension issues

Method used

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  • Method for making glass plate by floating method
  • Method for making glass plate by floating method
  • Method for making glass plate by floating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In order to confirm the non-adhesion between diamond-like carbon and tin, SUS304 (JIS G4304 [2005 edition]: hot-rolled stainless steel sheet and strip) was cut into 10 mm squares, and CrN was ion-plated to form a thickness of about 3 μm. Furthermore, a thin film of diamond-like carbon was formed thereon to a thickness of about 1 μm by a CVD method.

[0048] The prepared sample is placed in a vertical transparent quartz tube, and the spherical tin of about 1mmΦ after the reduction treatment at 1200°C in the hydrogen flow is placed in the center of the sample, while flowing through the quartz tube. Purity nitrogen is heated to 800°C with an infrared heating furnace. The oxygen concentration at the outlet of the quartz tube during heating was 1 ppm or less. Photographs were taken of the state of the sample and solder balls after 8 minutes at 800°C. The contact angle was about 164° on the diamond-like carbon thin film, and about 36° on the uncoated SUS304. In addition, t...

Embodiment 2

[0050] In actual production, in order to confirm the non-adhesion with tin, no peeling of the film, no tooth defects, and durability in the molten tin bath, through S25C (JIS G4051 [2005 edition]: carbon steel for mechanical structure The roller part of the upper roller made of steel material) was formed into a CrN film with a thickness of about 3 μm by the ion plating method in the same manner as in Example 1. Then, the roller portion was placed in a CVD chamber and cleaned to form a diamond-like carbon thin film of 1 μm. The roller part after film formation was joined to the rotating shaft made of stainless steel by welding. A pair of pipes are provided inside the rotating shaft, and cooling can be performed by passing water through the pipes. In addition, the surface of the rotating shaft of the upper roll is covered with a protective material made of ceramic material, and the head of the roller part is covered with a stainless steel protective material, and installed at b...

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Abstract

The invention provides an upper roller and a method for making a glass plate by the upper roller, wherein the upper roller has small adhesion performance with tin, has the tolerance on trace oxygen in the molten tin bath and has high durability on sufficient exerted pressing pressure and tension in the plate thinning process. The method for making the glass plate is realized by using a floating method and using the upper roller for exerting the tension on a molten glass belt on the molten tin bath in the basic orthogonal direction of the flowing direction of the molten glass belt. The upper roller is characterized in that the upper roller is made of mother materials formed by metal materials, and in addition, an adamantine carbon film is arranged on the surface of the mother materials of the upper roller.

Description

technical field [0001] The present invention relates to a method of manufacturing glass sheets by the float process, and in particular to an upper roll for stretching a glass ribbon formed in a bath of molten tin. Background technique [0002] In the case of manufacturing a glass plate by the float method, the molten glass in which the masterbatch prepared and mixed according to the composition of the glass product is dissolved is introduced into a molten tin bath, and the molten glass is moved on the molten tin to form it into a glass with a predetermined thickness and a predetermined width. Ribbons of molten glass (hereinafter referred to as glass ribbons). In this forming, in order to form a glass ribbon thinner than the equilibrium thickness of the glass ribbon on molten tin, a rotating roll called an upper roll having grooves and teeth at the tip that contacts the glass ribbon is used. In forming, the following method is used: the front end of the top roll is pressed a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B18/06
CPCC03B18/06
Inventor 富田成明滨岛和雄
Owner ASAHI GLASS CO LTD
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