Mold apparatus and method for vacuum forming glass sheets

Details Mold apparatus and method for vacuum forming glass sheets Mold apparatus and method for vacuum forming glass sheets

1998-08-04

1999-09-14

Griffin, Steven P.

Glass manufacturing

Processes

Reshaping or surface deformation of glass preform

65157, 65287, 65361, C03B 1106, C03B 23035

Patent

active

059517336

ABSTRACT:
Glass sheet forming apparatus (12) and a glass sheet forming method utilize a mold (20) having a curved forming face (22) with holes (26) in which a vacuum is drawn to form a glass sheet. A vacuum distributor (48) of the apparatus distributes a vacuum impulse of at least 0.1 atmospheres of vacuum from a valved vacuum reservoir (52) through a plurality of tubes (58) to a limited number of the holes (26) to provide additional forming of the glass sheet. The vacuum impulse distributor (48) is located within a vacuum chamber of the mold (20) that draws the vacuum by a gas jet pump in the holes (26) to which the vacuum impulse is not distributed.

REFERENCES:
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patent: 4222763 (1980-09-01), McMaster
patent: 4483702 (1984-11-01), Frank et al.
patent: 4877437 (1989-10-01), Nitschke
patent: 5079931 (1992-01-01), Lehto et al.
patent: 5318615 (1994-06-01), Nagai et al.
patent: 5376158 (1994-12-01), Shetterly et al.
patent: 5672189 (1997-09-01), Funk et al.
patent: 5755845 (1998-05-01), Woodward et al.

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