Abstract: A metering system for the coating of webs of paper and cardboard uses a doctor bar received in an elastic bed which is urged toward the surface to be coated by a pressurizable bladder subdivided into compartments. An elastic continuous member between the diaphragm and the bed equalizes the pressure so that sudden changes in pressure in the regions between the compartments are eliminated.

Abstract: An apparatus for applying a coating liquid to a web moving continuously along a path has a main frame forming an open space and a main backing roller journaled on the main frame and around which the web passes. A second frame in the space is independent of the main frame and displaceable relative thereto from a position in the space juxtaposed with the backing roller. An applicator unit on the second frame applies an excess of the coating liquid to the web and a dosing unit downstream along the path from the applicator unit strips from the web excess coating liquid and leaves on the web a coating of the liquid of a predetermined thickness.

Abstract: In a web-coating apparatus a web moving continuously in a travel direction passes in a contact arc partially around a cylindrical surface of a backing roller centered on an axis. An applicator system has an applicator roller extending parallel to the backing roller, having a smooth cylindrical outer surface, and forming a gap with the backing roller. The web passes through the gap. A substantially stationary support extends generally parallel to the backing roll axis across a full width of the web and a pusher element limitedly movable generally radially toward and away from the backing-roller axis on the support bears radially of the backing-roller axis on the applicator roller along the full width of the web. An inflatable hose between the pusher element and the support along the full width of the web urges the element and applicator roller toward the backing roller. A coating liquid is supplied to the gap across the full width of the web.

Abstract: For the application of a coating material onto a running material web, particularly a paper or cardboard web, a cylinder guides the web of material while a dosing element extends over the work width and has a surface which together with the cylinder forms an application gap converging in the travel direction of the web. In order to be able to apply various coating materials at high web speeds evenly and without disturbances, even at low application weights, the dosing element is supported swingably about an axis parallel to the cylinder, the radius of its surface guiding the coating material increases continuously in the travel direction of the web up to the dosing line and the surface ends at the dosing line with an edge whose radius is less than 8 mm.

Abstract: A coating apparatus for fabric webs carried along a counter roll includes an applicator which accomodates a chamber containing coating color to be applied onto the fabric web. The chamber is defined by spaced doctor blade and overflow plate and dam elements laterally sealing the chamber. For preventing a coating of the web along its edges, separate doctor assemblies are provided which are controlled independently of the dam plates.

Abstract: A device for coating a continuous web that travels over a back-up roll. The force of application can be adjusted. The coating material is applied to the web with a slotted applicator pipe. The pipe extends over the width of the web and has a preliminary coating-material flow-regulating gap. The width of the gap can be adjusted. A coating-material flow-regulating lip and a return lip adjoin the gap in such a way as to constitute a coating-material flow-regulating chamber extending over the width of the web. The flow-regulating lip is a doctor bed and has a doctor batten that moves with little friction along at least one overflow-side slide face. The face of the doctor batten toward the web that is being coated is rectangular and demarcates in conjunction with the web a narrowing wedge-shaped gap with a geometry that depends on the degree of contact pressure. The overflow edge of the face is a straight and sharp stripping edge. The face and stripping edge of the doctor batten are flexible.

Abstract: A device for unilaterally clamping an elastic doctor blade into a cutting beam. The tension of the blade is varied in relation to a web of material that is to be coated and that runs over a mating roll. The doctor blade rests against the web of material along a doctor line parallel to the cutting beam. The blade is rigidly supported in its midsection along a line of support that is in fixed position with respect to the web of material parallel to the doctor line. The lower edge of the doctor blade can be displaced with respect to the plane of the doctor line and the line of support. The doctor blade is positioned in a longitudinal recess in the cutting beam. The doctor blade is clamped into the longitudinal recess against an elastic resistance in the cutting beam by means of an elastic pressure-medium hose. The lower edge of the doctor blade is guided toward the line of support when displaced out of the plane of the doctor line and the line of support.

Abstract: A system for the axial feed of air to one of two air nozzles (7, 7) which together are rotatable about a longitudinal center axis (4), comprising a housing (6) having a pair of stationary air feed ducts (10, 11) each of the ducts terminating in a thrusting surface (19) perpendicular to the longitudinal center axis of the air nozzle, a gasket retainer (21) spaced from the thrusting surface, a compressible gasket (20) between the thrusting surface and the gasket retainer, and a rotatable hollow journal (23) for carrying the air nozzles at its downstream end and at its upstream end being pressed against the gasket retainer.

Abstract: In an apparatus for the continuous, uniform coating with a liquid coating material of a web passing over a counter roll, comprising an air-nozzle arrangement for the removal of excess coating material and the smoothing of the coating, said air-nozzle arrangement being rotatable about its longitudinal center axis, being disposed adjacent to the counter roll and comprising two slot nozzles disposed symmetrically about its longitudinal center axis and displaced 180 degrees relative to each other, each nozzle extending at least over the width of the web, and the two lips of each nozzle being seated on nozzle-lip holders mounted on the casing of the air-nozzle arrangement, the improvement which comprises imparting to the nozzle-lip holders an angular construction and mounting them on the casing in such a way that they can be positioned and adjusted in the direction of the nozzle-slot width; one of the nozzle-lip holders being of smaller cross section over its angled area than the other nozzle-lip holder; the nozzl

Abstract: An apparatus for the regulation of the coating thickness in the coating of continuous webs of material has a doctor-roll which bears on the coated side of the web and which is supported in a shape-retaining, wear-resistant doctor-roll bed. The doctor-roll bed is elastically joined to a stationary frame of the apparatus in such a manner that it is removably mounted for replacement independent of the remainder of the elastic joint.

Abstract: An apparatus for the continuous simultaneous application of coatings of constant thickness to two sides of a material web, having two adjustable two-edged spreader blades confronting one another at an angle, between which the material web passes for the proportioning of the coatings, a chuck for each blade, and means clamping each spreader blade along one edge in the chuck, the other edge of each blade parallel to the clamping line being free and engaging under bias and a corresponding biasing force the material web carried over the free edge of the other spreader blade at an acute angle to the direction of movement of the material web, and means applying a biasing force to each blade along a fulcrum line the improvement wherein one spreader blade is rigid and the other spreader blade is resilient, the chuck of the resilient spreader blade being pivotable about the engagement line between the resilient spreader blade and the rigid spreader blade and about a line outside of the clamping line for movement away

Abstract: A device for continuous application of coating of constant thickness to a web employing an elastic coating knife fixed in a clamping jaw and having a free edge parallel with a fixing line, the knife being prestressed against the web which is running over a roll, the knife center area being supported along a backup line, the clamping jaw being pivotable about the abutting line of the knife on the roll and about a line outside the fixing line in which the abutting and backup lines are fixed relative to the roll and the fixing line is continuously movable relative to the roll.