In-lehr press bending using pressurized gas

Details In-lehr press bending using pressurized gas In-lehr press bending using pressurized gas

C - Chemistry, Metallurgy

03

B

49/22, 49/84

C03B 23/035 (2006.01) C03B 23/023 (2006.01) C03B 23/03 (2006.01) C03B 29/08 (2006.01)

Patent

CA 1328740

ABSTRACT Glass sheets are positioned on a shaping rail of an outline shaping mold for movement through a heating lehr and subsequent preliminary sag bending. The mold with the glass sheet supported thereon is positioned between a pair of vertically aligned pressing molds. The lower mold includes a full surface press face corresponding to the final desired curvature of the glass sheet to be shaped. The upper mold includes a peripheral shaping surface and a chamber defined by the shaping surface. After the lower mold lifts the glass sheet off the outline mold and into engagement with the upper mold, gas in the chamber is pressurized to urge those portions of the glass not contacted by the upper mold against the press face of the lower mold.

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