Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1990-11-05
1994-11-22
Ball, Michael W.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156104, 156109, 156145, 156292, B32B 3116, E06B 324
Patent
active
053665740
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a process of assembling insulating glass panes which have an interior space disposed between pairs of glass plates, which are spaced apart along their edges by a framelike metal or plastic spacer and are adhesively joined to each other and in said interior space are filled with a gas other than air. From German Utility Mode 87 15 749 it is known that insulating glass panes which are adhesively joined at their edge can be filled with a heavy gas if a spacer consisting of a metallic tubular frame is made before said insulating glass pane is assembled. That frame is formed at least at two points with through bores, which are about 4 mm in diameter. Even the manufacture of a spacer having such through bores involves technical problems because such spacer usually consists of a tubular bar, which is perforated on that side which faces the interior of the pane and is filled with a granular desiccant, which serves to bind moisture contained in the interior space of the pane. To prevent an escape of the granular desiccant from the bores provided for the filling with a heavy gas, it is necessary to keep the bored-through leg of the spacer free from desiccant so that the amount of moisture which can be absorbed will undesirably be decreased, or to seal the bore to the adjoining cavity of the tubular spacer bar, e.g., in that a sleeve is inserted into the spacer or in that the outer wall of the spacer is forced in against the wall which faces the interior of the pane. The forcing-in must so be performed that the two side of the spacer remain exactly planar because they must adhesively be joined to the two planar glass plates. To that end, they are usually coated with an adhesive, particularly with a polyisobutylene.
For the assembling of an insulating glass pane it is known to place a spacer, which is coated on both side faces, onto a first glass plate in pressure contact therewith, then to place a second glass plate on the spacer in pressure contact therewith, and to press the resulting unit to a predetermined thickness, particularly between two planoparallel plates.
It is also known that the pressed insulating glass pane can subsequently be filled with a heavy gas, for instance, with argon or sulfur hexafluoride SF.sub.6. To that end, a filling probe is inserted into one of the bores of the spacer and the heavy gas is filled through said probe into the interior space of the heavy gas. At the same time, a suction probe is inserted into the second bore of the spacer (DE 31 17 259 C1, DE 31 17 256 C2), or a suction head is placed on the spacer adjacent to the second bore. In that case the insulating glass pane is filled with the heavy gas at a first location and air and subsequently an air-heavy gas mixture is sucked off through another bore of the spacer at a second location, which is as remote as possible from the first. That operation is continued until the insulating glass pane has sufficiently been filled with heavy gas, as may be checked by an oxygen-sensitive sensor, which may introduced into the interior space of the pane through a third bore of the spacer or may be introduced into the gas stream which is sucked from the second bore. The insulating glass pane stands preferably upright during its assembling and filling with a heavy gas and the bore used to fill the pane is preferably disposed on the lowest possible level and the suction bore on the highest possible level. Because the heavy gas has a higher specific gravity than air, the heavy gas introduced on the lower level will progressively displace the air upwardly in the insulating glass pane. Substantial losses of heavy gas may be avoided if the flow-in velocity of the heavy gas is sufficiently low during the filling operation. In that case, however, the filling with heavy gas is by far the slowest process step in an insulating glass production line so that the output of such line in case of a filling with a heavy gas will be considerably lower than that of an insulating glass production line without a filling with heavy gas. In
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Bogner Uwe
Lenhardt Karl
Ball Michael W.
Lenhardt Maschinenbau GmbH
Stemmer Daniel J.
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