Glass manufacturing – Processes – Glass preform treating
Patent
1991-12-18
1993-02-23
Lindsay, Robert L.
Glass manufacturing
Processes
Glass preform treating
15163, 15349, 15289, C03B 2704
Patent
active
051886510
ABSTRACT:
A system is provided for heating and thermally conditioning glass sheets, wherein sheets are conveyed individually or in groups or loads through a tunnel-type heating furnace and thermal conditioning area upon a series of aligned rollers. The rollers are driven in groups, with each group having an independent drive mechanism. The independent drive mechanisms are provided with interrelated controls whereby the system is controlled in zones of one or more groups of rolls. A sheet or load of sheets is advanced into a zone, and the rolls within that zone are then driven to convey the sheet or load in an oscillating forward and reverse manner to oscillate the glass within the zone. The oscillation proceeds according to a predetermined schedule whereby the distances travelled by the sheet or load on each forward and reverse stroke varies according to a predetermined pattern so that the contact points between the glass and rolls is different upon each reversal in direction. Similar oscillating schedules may be employed in subsequent zones of the heating furnace, as well as in a thermal conditioning region through which the sheet or load is conveyed.
REFERENCES:
patent: 3994711 (1976-11-01), McMaster
patent: 4617043 (1986-10-01), Reunamaki
patent: 4816055 (1989-03-01), Reunamaki et al.
Libbey-Owens-Ford Co.
Lindsay Robert L.
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