Nozzle structure for moistening or impregnating a web
AssigneeBachofen & Meier
InventorPaul Meier
Life of this patent
Estimating the term…
Abstract
In a process for the moistening, impregnating and refining of a web of paper, carton, foil and the like, the web is treated in steam by the condensation effect of liquid supplied through nozzle bodies, and a precipitate is produced. An apparatus for carrying out the process has nozzle bodies arranged in a casing and connected to a steam supply, the nozzle bodies each containing a heater for heating the liquid and gas in a substantially pressureless condition in front of the nozzle outlets. Cooling elements are provided for the cooling of the web fed past the nozzle bodies, the whole being arranged such that, through the liquid being supplied, a condensation and thus a precipitation onto the surface of the web are produced.
Claims12
A nozzle operative to apply a gaseous medium to a web of paper or the like to moisten or treat said web as said web is fed past said nozzle, said nozzle comprising an elongated housing adapted to extend in a direction transverse to the direction of feeding of the web across one face of the web, said housing including an elongated pipe extending therethrough at a position closely adjacent the web and parallel to said one face of said web, said pipe being adapted to be supplied with a gaseous medium, said housing further including a front wall extending downwardly from said pipe in a plane closely adjacent to but spaced from said one face of said web, a bottom wall spaced from said pipe and extending rearwardly from said front wall away from said one face of said web, a rear wall extending upwardly from said bottom wall to a position above said pipe, and a top wall extending from said rear wall toward said one face of said web, said top wall including an edge which is positioned adjacent to but spaced from an upper surface of said steam pipe to define an elongated nozzle outlet between said pipe and said top wall edge, an interior wall in said housing extending downwardly from said pipe in spaced relation to said front wall and rear wall, the lower edge of said interior wall being spaced from said bottom wall of said housing, heater means in the region defined between the bottom of said pipe, said front and interior walls, and said bottom wall, and a plurality of ports in said pipe opening into said region, whereby a gaseous medium passing through said pipe flows through said ports into said region and past said heater means between said front and interior walls, then passes through the space between the lower edge of said interior wall and said bottom wall, flows through the region defined between said interior wall, said rear wall, and a rear surface of said pipe, and emerges from said nozzle outlet toward said moving web to flow past said web in the space defined between a forward surface of said pipe and said front wall.
A nozzle for applying a heated gaseous medium to a moving web of paper or the like as said web moves past said nozzle, said nozzle comprising an elongated housing adapted to have one of its exterior faces disposed adjacent to but spaced from the web with the direction of elongation of said housing oriented transverse to the direction of movement of the web, wall means in said housing subdividing the interior of said housing into first and second elongated channels that extend in side-by-side relation to one another within said housing in the direction of elongation of said housing, inlet means in said housing for supplying a heated gaseous medium to one end of said first elongated channel, said wall means defining a plurality of ports within said housing that are spaced from one another in the direction of elongation of said first and second elongated channels for passing the heated gaseous medium supplied to said first elongated channel from said first channel into said second elongated channel in flow directions that are transverse to the directions of elongation of said first and second elongated channels, an elongated heater within said second elongated channel extending in the direction of elongation of said second channel, said heater including a plurality of radiator plates that are disposed in spaced closely adjacent relation to one another in planes transverse to the direction of elongation of said second channel for raising the temperature of the heated gaseous medium which flows through said ports into said second channel and past said spaced radiator plates, and an elongated slot-like outlet in said housing extending in the direction of elongation of said housing in the exterior face of said housing which is adapted to face the moving web, said elongated slot-like outlet being in communication with said elongated second channel at a position downstream of said elongated heater for supplying the raised-temperature gaseous medium from said second elongated channel to the moving web, the exterior face of the housing which is adapted to face the moving web including inclined walls adjacent to and defining said elongated slot-like opening, said inclined walls being oriented to direct the raised-temperature gaseous medium emerging from said slot-like opening toward the space which is defined between said housing and the web when said exterior face of said elongated housing is disposed adjacent to but spaced from the moving web thereby to cause said gaseous medium to flow through said space in directions generally parallel to the plane of the moving web.
Dependencies are inferred from the claim text.