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US 2014/0227468 A1Published application
Duct and a method for its manufacture
AssigneeClimate Recovery Ind AB
InventorsPeter Wallin, Göran BERNHARDSSON
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AssigneeClimate Recovery Ind AB
InventorsPeter Wallin, Göran BERNHARDSSON
Estimating the term…
A ventilation duct includes a refractory fibre material and binder agent and has longitudinal wall sections and longitudinal fold- or joint lines located there between. The wall sections between the fold- or joint lines have longitudinal, thickened and outwardly bulging portions in which longitudinal rigidifying dements are disposed. A method of manufacturing the ventilation duct includes manufacturing the duct in the planar, spread-out state, wherein the wail sections which are located along opposing edges of the spread-out duct, are given a configuration which corresponds the configuration of half of the other wall sections, whereby the duct, after raising to the intended configuration, is given a longitudinal joint where the half wall sections meet one another.
A duct comprising a number of longitudinal wall sections at least partly produced from a refractory fibre material and binder agent, and which together define a closed, elongate flow space, mutually meeting all sections being united with one another h the intermediary of a fold- or joint line, wherein the wall sections between adjacent fold- or joint lines have longitudinal, thickened and outwardly bulging portions.
A method of manufacturing a duct with a number of longitudinal wall sections and between pairwise of these wall sections longitudinal fold- or joint lines, the duct being manufactured from binder agent and at least one web composed of one or more layers or refractory fibre material, which is compressed, wherein the duct is manufactured in the spread-out planar state, that the wall sections between adjacent fold- or joint lines are given longitudinal, thickened portions, that those wall sections which are located along opposing edges of the spread-out duct, are given a configuration which corresponds to the configuration of half of the remaining wall sections whereby the duct, after raising to the intended cross sectional configuration by bending, of the fold- or joint lines will have a longitudinal joint where the half wall sections meet one another.
A method of manufacturing a duct with a number of longitudinal wall sections and between pairwise of these wall sections longitudinal fold- or joint lines, the duct being manufactured from binder agent and at least one web composed of one more layers of refractory fibre material, which is compressed, wherein at least one web of fibres and binder agent is wound about or applied longitudinally on a core, so that a tubular configuration is formed, that the web or the webs are compressed from outside so that a number of longitudinal, thickened portions are formed on either side of each fold- or joint line.
Dependencies are inferred from the claim text.