Method of separating strengthened glass

A technology for strengthening glass and glass sheets, which is used in glass tempering, glass cutting devices, glass manufacturing equipment, etc., and can solve problems such as difficulty in glass cutting or separation, glass crushing, and crack propagation.

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

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Problems solved by technology

[0004] Although thermal tempering or chemical strengthening makes the glass strong and resistant to damage, residual stresses within the glass make cutting or separating chemically strengthened glass difficult
Specifically, mechanical scribi...

Method used

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

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Embodiment Construction

[0013] In the following description, like reference numerals designate like or corresponding parts in the several views shown in the drawings. It should also be understood that terms such as "top", "bottom", "outwardly", "inwardly", etc. are terms of convenience and are not to be regarded as terms of limitation unless otherwise indicated. Furthermore, whenever a group is described as containing at least one of a group of elements and combinations thereof, it should be understood that the group may contain any number of these listed elements individually or in combination with each other, or primarily Made of them, or made of them. Similarly, whenever a group is described as consisting of at least one of a set of elements or a combination of them, it is to be understood that the group may consist of any number of these listed elements, either individually or in combination . Unless otherwise stated, the recited numerical ranges include both the upper and lower limits of the s...

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PUM

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Abstract

A method is provided for separating or dividing strengthened glass articles, particularly strengthened glass sheets, into at least two pieces, one of which has a predetermined shape and/or dimension. A flaw is initiated in the glass at a depth that is greater than the depth of the strengthened surface layer of the glass, and a vent extending from the flaw is created at a vent depth that is greater than the depth of and outside the strengthened surface layer to at least partially separate the glass. In one embodiment, the vent is generated by treating the glass with a laser to heat the glass to a temperature in a range from about 50 DEG C below the strain point of the glass up to a temperature between the strain point and the anneal point of the glass. A glass article having at least one strengthened surface and at least one edge having an average edge strength of at least 200 MPa is also described.

Description

[0001] Related Application Cross Reference [0002] This application claims priority to US Application Serial No. 12 / 388935, filed February 19, 2009. Background technique [0003] Introducing a surface compressive stress profile into glass is a well known method of strengthening glass. Specifically, glass can be chemically strengthened by thermal tempering or ion exchange to introduce residual stress into the glass. Chemical strengthening by ion exchange involves exposing a glass containing alkali metal ions to a molten salt bath that contains more alkali metal ions than would otherwise be contained in the glass. Due to the chemical potential difference, some ions in the glass are replaced by larger ions to form a larger volume layer, which generates compressive stress in the surface of the glass, thereby compensating for the internal tensile stress, thereby maintaining the balance of the acting force. [0004] Although thermal tempering or chemical strengthening makes the g...

Claims

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Application Information

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IPC IPC(8): C03B33/09C03B33/02
CPCC03B27/0413C03B33/091C03B25/08C03B33/0222C03B33/023C03B33/027C03B33/072
Inventor A·A·阿布拉莫夫S·戈麦斯S·楚达
Owner CORNING INC
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