Duct liners

Details Duct liners Duct liners

1999-04-09

2000-11-21

Brinson, Patrick

Pipes and tubular conduits

Distinct layers

With intermediate insulation layer

138151, F16L 914, B32B 328

Patent

active

061488674

ABSTRACT:
Ducts are formed from rigid or semi-rigid insulation boards by forming a plurality of longitudinally extending, spaced apart, parallel kerfs in a first major surface of each of the insulation boards which is adapted to be the interior surface of the duct. When the insulation board is formed into a duct of the preselected dimensions, the shoulders of the kerfs adjoining the interior surface of the duct abut and, preferably, the insulation material in the shoulders of the kerfs is compressed. The flexibility of the insulation boards, in the direction of the widths of the insulation boards, is controlled by increasing the depths and/or the widths of the kerfs and/or decreasing the spacing between the kerfs to make the insulation board more flexible and by decreasing the depths and/or the widths of the kerfs and/or increasing the spacing between the kerfs to make the insulation board less flexible.

REFERENCES:
patent: 4576206 (1986-03-01), Lauren
patent: 4838968 (1989-06-01), Nelson
patent: 5024131 (1991-06-01), Weidman
patent: 5134917 (1992-08-01), Holland
patent: 5232762 (1993-08-01), Ruby
patent: 5310594 (1994-05-01), Holland et al.

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