Method of separating strengthened glass

A technology for strengthening glass and glass sheets, which is applied in glass manufacturing equipment, glass cutting devices, manufacturing tools, etc., and can solve problems such as multiple bifurcations and broken glass samples into multiple pieces.

Active Publication Date: 2012-02-15
CORNING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conventional score-break technique cannot be used because the initial crack will not propagate along the score line, but multiple bifurcations will occur
As a result, glass samples often shatter into multiple pieces

Method used

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  • Method of separating strengthened glass
  • Method of separating strengthened glass
  • Method of separating strengthened glass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A glass sample with the following composition was melted at 410°C in KNO 3 Soak in bath for 7 hours to allow ion exchange: 66.7 mol% SiO 2 ; 10.5 mol% Al 2 o 3 ; 0.64 mol% B 2 o 3 ; 13.8 mol% Na 2 O; 2.06 mol% K 2 O; 5.50 mol% MgO; 0.46 mol% CaO; 0.01 mol% ZrO 2 ; 0.34 mol% As 2 o 3 ; and 0.007 mol % Fe 2 o 3 . The thickness of the resulting ion exchange layer on the glass surface was about 50 microns.

[0043] The glass sample was mounted on a computer-controlled XYZ frame moving at a speed of 30-300 mm / sec. First use a 0.27-NA lens to converge the output beam of the 355nm nanosecond Nd-YAG laser on the rear surface (i.e. the glass surface farthest from the laser, e.g. figure 1 and 2 50-100 microns above the second surface 120) in the center, converged into a light spot with a diameter of 1-3 microns. The average power of the laser beam is 1W, and the repetition rate is 150kHz. After writing the first break line near the rear surface, refocus the beam o...

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Abstract

A method of cutting a glass sheet that has been thermally or chemically strengthened along a predetermined line, axis, or direction with high speed and with minimum damage on the cut edges. The strengthened glass sheet may be cut into at least two pieces, one of which having a predetermined shape or dimension. At least one damage line is formed within the strengthened glass sheet. The at least one damage line is formed outside the strengthened compressive stress surface layers and within the tensile stress layer of the strengthened glass sheet. The at least one damage line may be formed by laser treatment. A crack is initiated in the strengthened glass sheet and propagated along the at least one damage line to separate the strengthened glass sheet along the predetermined line, axis, or direction into at least two pieces.

Description

[0001] Related Application Cross Reference [0002] This application claims priority to US Application Serial No. 12 / 388837, filed February 19, 2009. Background technique [0003] Thermal tempering and chemical treatment by ion exchange are well known methods for strengthening glass. Glass strengthened by these methods has compressive stress in the surface layer and tensile stress in the interior. [0004] Glass that has been tempered or chemically strengthened is difficult, if not impossible, to cut or separate into small pieces of the desired shape and / or size. Therefore, the cutting operation should be carried out before the strengthening operation. The conventional score-break technique cannot be used because the initial crack does not propagate along the score line, but multiple bifurcations occur. As a result, glass samples often shatter into multiple pieces. Summary of the invention [0005] The present invention provides a method of cutting a thermally or chemica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B33/04C03B33/09C03B33/02C03C3/083
CPCC03B33/0222C03B33/04C03B33/091C03C3/093C03C21/002Y10T428/15Y10T428/192C03B33/023C03B33/082C03C23/0025
Inventor D·R·哈维A·M·斯特列利佐夫
Owner CORNING INC
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