Method of and apparatus for severing a glass sheet
AssigneePPG Industries, Inc.
InventorRobert P. DeTorre
Life of this patent
Estimating the term…
Abstract
A subsurface score is imposed in one surface of a glass ribbon at the bulb edge and an open score imposed in the opposite surface aligned with the subsurface score. The ribbon is cut into lehr ends after which bending moment forces are applied about the scores to propagate the open score toward the subsurface score to sever the bulb edge from the ribbon to provide a glass sheet having substantially smooth cut edges.
Claims16
A method of severing a piece of refractory material having a first surface and a second opposed surface, comprising the steps of:
- imposing a first score in the piece, the first score not extending to either surface of the piece and being within the body of the piece at a location between the first surface of the piece and the centerline of the piece between the first and second surfaces;
- followed by
- imposing a second score in the piece, the second score being generated in the second surface of the piece and extending into the piece toward the first surface terminating short of the centerline between the first and the second surfaces and generally aligned with the first score;
- and
- applying bending moment forces about at least one of the scores to sever the refractory piece along the scores.
A method of severing a piece of refractory material having a first surface and a second opposed surface, comprising the steps of:
- imposing a first score in the piece, the first score being generated in the first surface of the piece and extending into the piece toward the second surface terminating short of the centerline between the first surface and second surface;
- followed by
- imposing a second score in the piece, the second score not extending to either surface of the piece and being within the body of the piece at a location between the second surface of the piece and centerline of the piece between the first and second surfaces and further being generally aligned with the first score;
- and
- applying bending moment forces about at least one of the scores to sever the refractory piece.
Dependencies are inferred from the claim text.