Severing by tearing or breaking – Methods – With preliminary weakening
Patent
1997-10-08
1999-02-16
Rachuba, M.
Severing by tearing or breaking
Methods
With preliminary weakening
225 935, 225 965, 83879, B23F 300
Patent
active
058711341
ABSTRACT:
For breaking and cutting a glass to obtain a glass plate having a rectangular shape, a first preliminary break is formed in a portion of a glass ribbon near a side edge of the glass ribbon along a first planned breaking and cutting line perpendicular to a transferring direction of the glass ribbon. Local heating is movably applied to a portion of the first preliminary break near an end of the first preliminary break to progress a first actual breaking and cutting line therefrom. A first bending moment is applied along the first planned breaking and cutting line to break and cut the glass ribbon in a direction substantially perpendicular to the transferring direction so as to obtain a glass plate. Second preliminary breaks are formed in an end of the glass plate along second planned breaking and cutting lines substantially parallel with the transferring direction. Local heating is movably applied to portions of the second preliminary breaks near each end thereof to progress second actual breaking and cutting lines, using as starting points the ends of the second preliminary breaks. Second bending moments are applied along the second planned breaking and cutting lines to break and cut the glass plate in a direction substantially parallel with the transferring direction.
REFERENCES:
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Proceedings of the IEEE, vol. 57, No. 2, pp. 114-115, 132-135 and 146, Feb. 1969, Francis P. Gagliano, et al., "Lasers In Industry".
Iseda Toru
Komagata Kazuyuki
Asahi Glass Company Ltd.
Rachuba M.
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