Stock material or miscellaneous articles – Sheet including cover or casing – Filled with gas other than air; or under vacuum
Patent
1983-08-12
1985-04-23
Thibodeau, Paul J.
Stock material or miscellaneous articles
Sheet including cover or casing
Filled with gas other than air; or under vacuum
181288, 181294, 428 76, 428200, 428920, B32B 300
Patent
active
045130418
ABSTRACT:
This invention relates to vacuum-tight tubular enclosures, made of plastic material and designed for making up insulating panels. Each vacuum cell is composed of a rigid plastic tube (1), both ends of which are closed by perforated plugs (3). This tube is placed in a thin flexible sheath (6) of highly impervious plastic material, preferably polyvinylidene or a derivative of polyvinylidic alcohol. This sheath extends beyond both ends of the rigid tube and is sealed by welding after the rigid tube has been evacuated to a high vacuum, namely less than 10.sup.-3 mm Hg. The extensions of the sheath are flattened and joined together by seams in a grid pattern so as to form offset rows of alveoles (11) for effectively preventing air leaks into the evacuated tube.
This invention also relates to thermal and/or acoustic insulating panels in which evacuated cells (18, FIG. 9) of the above design are inserted, preferably in overlapping layers. Preferably, the panel is made of several layers of insulating alveolar material, and at least one such layer (12, FIG. 8) is provided with recesses matching the shape of the vacuum cells.
REFERENCES:
patent: 4038447 (1977-07-01), Brock
patent: 4228869 (1980-10-01), Bschorr
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