Treating covers for press bending molds, and method of press ben

Details Treating covers for press bending molds, and method of press ben Treating covers for press bending molds, and method of press ben

1979-11-02

1981-06-23

Kellogg, Arthur D.

Glass manufacturing

Processes

Utilizing parting or lubricating layer

65106, 65273, 65374RM, C03B 2303

Patent

active

042748577

ABSTRACT:
Applying a boron nitride composition to a flexible fiber glass fabric cover for a press bending mold for shaping heat-softened glass sheets having a portion painted with a composition consisting essentially of a finely divided frit-pigment mixture by impregnating at least the portion of the cover that engages the painted portion of the glass sheet reduces the likelihood of marking the press bent glass sheet in unwanted regions. In addition, such impregnation facilitates removing the press bending molds from the press bent glass sheet when the press bending molds are separated after engaging the heat-softened glass sheet.

REFERENCES:
patent: 2560599 (1951-07-01), Ryan
patent: 3420652 (1969-01-01), Seymour
patent: 3492109 (1970-01-01), Robinson et al.
patent: 3713798 (1973-01-01), Stilley et al.
patent: 3783013 (1974-01-01), Seeman
patent: 3853525 (1974-12-01), Gorman
patent: 4097257 (1978-06-01), Davey

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