Process and device for applying a protective film to an alveolated board

Claim 1

Device for applying a protective film to alveolar structured boards with two flat spaced panels coupled by partitions integral therewith and making longitudinal cavities comprising: means for driving the said boards in line in a flat translation movement, two successive boards (a and b) being separated by a distance e which is at least equal to their thickness; means for depositing a film of flexible material on one flat panel of the first board (a), then on the second board (b) in such a manner that said film extends over said distance e; means for transversely cutting said film present over said distance e provided between boards (a and b) so as to obtain at least one free part of said film; means for folding said at least one free part onto a side of one of the boards so as to cover the cavities, said means comprising air blowing nozzles; means for sealing said at least one free part folded onto said side to the board; said means for cutting said film, said means for folding and said means for sealing being mounted on a carriage means moving with said boards and being temporarily rigidly coupled to said boards during said cutting of said film, folding and sealing of said at least one free part of said film to one of said boards.