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Process and apparatus for thermal edge finishing a glass sheet with reduced residual stress

A glass sheet and edge technology, applied in the field of hot edge finishing, can solve the problem of not revealing the method of releasing residual stress

Inactive Publication Date: 2009-08-12
CORNING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it does not disclose any method for relieving residual stresses

Method used

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  • Process and apparatus for thermal edge finishing a glass sheet with reduced residual stress
  • Process and apparatus for thermal edge finishing a glass sheet with reduced residual stress
  • Process and apparatus for thermal edge finishing a glass sheet with reduced residual stress

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Embodiment Construction

[0021] In the following detailed description, for purposes of illustration and not limitation, exemplary embodiments illustrating specific details are given in order to provide a thorough understanding of the present invention. However, it will be apparent to those of ordinary skill in the art, having the benefit of this description, that the invention may be practiced in other embodiments than those detailed herein. Additionally, descriptions of well-known devices, methods and materials may be omitted herein so as not to obscure the description of the present invention.

[0022] The process shown for hot edge finishing ( figure 1 ) includes four main steps: preheating (step 20), thermal stretching along the edge of the glass (step 21), laser edge finishing (step 22), and post-laser local heat treatment / annealing (step 23). By raising the temperature of the glass inside the edge of the glass, the glass material along the edge is thermally stretched. As a result, the heat app...

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Abstract

A thermal edge-finishing process includes pre-heating an edge of a glass sheet, focused heating inboard of the edge to cause thermal tensioning, laser finishing the edge, and localized annealing of the edge. By stress cancellation, the thermal energy added by a laser edge-finishing operation does not result in as much residual stress. By the present process, residual stress is reduced to below 3000 psi, and more preferably to about 1000 psi, and as low as 600 psi in the first 1 mm along the treated edge.

Description

technical field [0001] This invention relates to hot edge finishing of glass sheets, and more particularly to: first heat stretching the edge of the glass sheet, then laser finishing the edge, then annealing the edge after the laser finishing operation, laser The pre- and post-finishing operations combine to reduce residual tensile stress along the edge. Background technique [0002] At least one existing method of finishing glass sheets for liquid crystal displays (LCDs) requires the application of coatings for surface protection, a mechanical cutting process such as mechanical scoring with a scoring wheel, and a finishing process , such as polishing. These processes have historically been wet processes, requiring the glass sheet to be cleaned to remove contamination from glass debris produced during mechanical scoring and polishing. There is a need to be able to omit cleaning of the glass sheet during edge finishing and the related steps in the finishing process after th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B29/02C03B29/08C03B29/16
CPCC03B29/08C03B29/16C03B29/025C03B29/02
Inventor N·D·卡瓦拉奥三世Z·-S·常G·N·库德瓦罗伟炜L·乌克兰采克S·S·朱彼
Owner CORNING INC
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