Abstract: An apparatus for direct or indirect application of a liquid or pasty coating medium onto a traveling material web, notably of paper or cardboard, includes at least one oblong working unit wetted by the coating medium and an oblong support element carrying the working unit. The at least one working unit and the support element are thermally shielded from one another. The at least one working unit and the support element are joined to one another by way of an elongation compensation system.

Abstract: The invention relates to an applicator for direct or indirect application of a coating medium onto a traveling material web, notably of paper or cardboard, including a dosing apparatus with a dosing slot configured as an open-jet nozzle and formed between two lips. The applicator also includes a coating edge delimiting apparatus with at least two coating edge delimiting elements that are arranged between the two lips and close off the dosing slot on its side edges, substantially sealing it.

Abstract: An application unit for applying a liquid or pasty medium onto a surface moving past the application unit. This has particular application to direct or indirect application of such a medium to a paper or board web. A support beam and a front wall supported generally further from and a rear wall supported generally closer to the moving surface. The walls are spaced apart for defining a pasty medium supply gap between them and are oriented so that the supply gap generally directs the medium toward the surface. The front and rear walls can selectively receive releasable attachment of members for forming a liquid medium an application chamber, the chamber having a downstream end with a blade, an upstream end with a damming strip over which the excessive medium in the application chamber can overflow. Alternatively, a second set of attachable members may be attached to the walls for forming a free jet nozzle dosing gap that communicates with the supply gap for directing the medium to the surface.

Abstract: Apparatus for the application of at least one liquid medium onto a moving material web, in particular of paper or cardboard, including an application mechanism (3) for the liquid medium and a roller (2) associated with the application mechanism for receiving the liquid medium in the case of an indirect application or for guiding the material web in the case of direct application, the application mechanism (3) including a dosaging blade (4) and a damming strip (7) arranged at a distance from the dosaging blade as seen against the direction of rotation of the roller (2), the damming strip together with the dosaging blade defining an application chamber (6), a running-off surface (8) over which the excess liquid medium flows out of the application chamber (6) and over the damming strip (7), and wherein the dosaging blade (4) has a blade holder (5) with a base strip (5b) mounted in the application mechanism (3).

Abstract: A device for coating a material web includes a rotatable applicator roll having a surface for collecting a film of a coating composition thereon. The roll has a length defined by first and second ends thereof and a middle region disposed between the first and second ends. The device also includes a blade having an edge. The blade is attached to a blade holder and extends along the length of the applicator roll. The blade and the applicator roll surface form an acute angle and define a coating composition sump. The blade edge and the applicator roll surface define an inlet gap. A doctor element attached to a doctor element holder is disposed downstream of the blade with respect to a direction of rotation of the applicator roll. The blade, the blade holder, the doctor element, and the doctor element holder define, at least in part, an application chamber. At least one of the elements defining the application chamber has bores or other openings for regulating coating composition thickness on the applicator roll.

Abstract: A dosing system with a doctor element fashioned as a doctor rod, for the coating of material webs which are passed over at least one roll coordinated with the doctor element. The doctor element is accommodated in a bed supported by a holder of integral design with the bed and held on the wall of a mounting which at the same time is a bounding wall of the mouth channel for the coating mixture. The holder features on its end on its side opposite the mounting wall a clamping or mounting surface. The holder possesses in the end area of the mounting wall bounding on the feed channel a jump in thickness. On its side opposite the said clamping or mounting surface, a protuberance is provided with a bevel which with the bounding wall of the holder contained on the side opposite the clamping or mounting surface forms an angle between 15.degree. and 55.degree., which bounding wall surface is flush with the surface of the mounting wall.

Abstract: A spreading device for the coating of moving material webs, especially paper or cardboard includes a clamping mechanism adapted to alternatively hold a doctor rod support bed or a coating blade, a pressing tube for pressing a doctor rod mounted on the doctor rod support bed onto a counter roll or a material web guided by a counter roll, and a profile strip having a tip portion adapted to press against a coating blade, the profile strip movable in a direction transverse to the counter roll by a displacement device. A plane defined by a pressing force through a contact region of the pressing tube and the doctor rod support bed and a plane defined by a pressing force through a contact region of the profile strip and the coating blade are disposed transversely with respect to a length of the counter roll and are either parallel or disposed at an acute angle to one another.

Abstract: A doctor blade holding apparatus, preferably for coating devices, includes a clamping mechanism which holds, via a mounting plate, a doctor blade support which carries a doctor rod. The apparatus includes a pressing tube which presses against the doctor blade support and thus presses the doctor rod against a counter roll. A holding strip provided at a back side of the doctor blade support clamps the mounting plate to the doctor blade support. The holding strip is disposed laterally with respect to a mid-plane of the doctor blade support to provide a contact region between a back side of the doctor blade support and the pressing tube which is in substantially the same plane as the mounting plate.

Abstract: An improved paper coating applicator has a body portion defined by forward and rearward relatively movable walls defining a chamber therebetween with an elongate opening thereto positionable generally below, adjacent to and transversely of a paper web, the chamber receiving coating liquid and directing the same generally upwardly through the opening and onto the web. According to one aspect of the improvement, the chamber and a distribution header for introducing coating material therein are of a design enhancing a very uniform application of coating material onto the web. In another aspect, a unique seal structure provides a secure, fluid tight connection between the front and rear walls.