Tool for locally cooling a glass sheet

A device for bending and/or cooling a glass sheet, the device comprising:

• at least one tool for local cooling by contact of said glass sheet at a temperature higher than 450° C., the at least one tool comprising
• an internal pipe for the circulation of a coolant,
• a contact face suitable for coming into contact with the glass sheet to locally cool the glass sheet, the contact face in communication with the internal pipe so that the contact face is cooled by the coolant, and
• an orientation member configured to change an orientation of the internal pipe and the contact face under the effect of the at least one tool coming into contact with the glass sheet,
• the glass sheet comprising a peripheral compression belt while the glass sheet is held by a bending tool or by a cooling frame after bending, the at least one tool being configured to create, by said contact face, a local compression zone that, situated at least partially inside the peripheral compression belt of the glass sheet, has an area of less than 10% of an area of the glass sheet.

A method for producing a local compression zone in a glass sheet, the method comprising:

• heating the glass sheet to a temperature higher than a strain point temperature of the glass sheet, then
• generally cooling the glass sheet to a temperature lower than the strain point temperature of the glass sheet, and
• local cooling by local contact being applied by at least one contact tool, the contact starting while the glass sheet is at a temperature higher than its strain point temperature and at a temperature higher than 450°0 C., the at least one tool comprising
• an internal pipe for the circulation of a coolant,
• a contact face suitable for coming into contact with the glass sheet to locally cool the glass sheet, the contact face in communication with the internal pipe so that the contact face is cooled by the coolant, the glass sheet comprising a peripheral compression belt, and
• an orientation member configured to change an orientation of the internal pipe and the contact face under the effect of the at least one tool coming into contact with the glass sheet,
• the at least one tool being configured to create, by said contact face, a local compression zone that, situated at least partially inside the peripheral compression belt of the glass sheet, has an area of less than 10% of an area of the glass sheet,
• wherein the local contact is applied while the glass sheet is undergoing or at the end of bending and/or while the glass sheet is undergoing general cooling.