C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
49/0.2
C03C 17/22 (2006.01)
Patent
CA 1157653
ABSTRACT OF THE DISCLOSURE The present invention provides a process for strength- ening glass products by ion exchange of alkali metal ions of a salt melt in contact with the glass products and conducted in a closed cycle, said salt melt flowing onto the products from above external surfaces of the glass products being subjected to a treatment with salt melt. The glass products being treated with the salt melt at jet intervals between 8 and 50 mm and at a spraying density of 5 cm3/dm2.s to 500 cm3/dm2.s such that there is produced a closed salt film having a thickness of 0.05 to 0.5 mm and resulting in a continuous pressure-braced layer which is cohesive on the external surfaces, the ion exchange being confined to the external surface or occuring primarily on the external surface, the glass products being superposed in several layers and sprayed in a cascade manner and the spraying density being con- trolled by dividing the salt flow into the actual spraying range and an adjustable reflux system. The present invention also provides in an apparatus for strengthening glass products by ion exchange with a salt melt said apparatus comprising a furnace having salt melt circulation system including a salt melt distributor in an upper portion of a treatment space for said glass products a salt melt receiver in a lower portion of the treatment space, a spraying range disposed between said dis- tributor and said receiver, said range being formed from intermediate distributors includingstacked boxes having perforated bottom trays and perforated trays, salt melt return system disposed in parallel with the spraying range and a transport system parts of which form intermediate distributors, the glass products being adapted to be moved on L-shaped conveying carriers of said trans- port system of said carriers extensions extending directly above the receiver into the furnace,
376377
Gruger Bernd
Heinrich Klaus
Patzig Dieter
Schelinski Siegfried
Marks & Clerk
Veb Wissenschaftlich-Technischen Betrieb Wirtschaftsglas
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