摘要:
An apparatus for direct or indirect application of a liquid or pasty medium onto a traveling material web includes at least one rotatable backing roll wrapped in part by the material web and supporting a side of the material web near the backing roll. The backing roll surface and the material web form a cuneiformly tapering entrance gore and an exit gore. At least one applicator opposes the backing roll and coats a side of the material web away from the backing roll with the medium, and/or further treats the coated material web side. A boundary layer stripper is arranged, in relation to the direction of rotation of the backing roll, before the applicator. The boundary layer stripper removes an air boundary layer entrained by the backing roll and/or the material web. The air boundary layer stripper is arranged in the entrance gore between the backing roll surface and the side of the material web near the backing roll.
摘要:
An apparatus applies a liquid or viscid coating medium onto a moving material web, especially one made of paper or cardboard. A coating mechanism first applies the coating medium onto an applicator element or an applicator roll, which subsequently transfers the coating medium at a coating location onto the material web in the form of a coating layer. Furthermore, if so desired, a doctoring device can be positioned at a doctor station, adjacent to the coating location, on the downstream side relative to the movement of the material web for the purpose of smoothing and/or metering the coating. The coating apparatus incorporates an apparatus for the generation and/or supplying of a fluid, preferably steam. This apparatus is positioned adjacent to the coating location or to the doctor station on the downstream side relative to the movement L of the material web.
摘要:
In a method of direct or indirect application of a liquid or viscous coating medium onto a moving material web, specifically a paper or cardboard web, a layer of the coating medium is applied to the material web by use of an applicator unit. The coating result is then checked for deviations from the desired coating result. In the event that such deviations are detected, and in order to correct them, at least one applicator unit operating parameter is adjusted. The adjustment is made within a short time period, and with the material web running, from an initial operating parameter value that is in effect prior to detection of the deviation. Subsequently, the operating parameter is then reset to at least approximately the initial parameter value, whereby the adjustment and the subsequent resetting may be repeated if necessary. With this method, particularly with a free jet applicator, streaking in the coating profile of the applied layer, caused by dirt particles or other contaminations which have deposited themselves in the jet discharge opening of the free jet applicator, may be eliminated.
摘要:
A method and apparatus for coating a traveling layer of material, in particular paper and/or cardboard. An applicator implement applies a predetermined and proper amount of a liquid or pasty medium onto an outer surface of a first rotating applicator roller which in turn transfers the liquid or pasty medium onto a first side of the moving layer of material just as it is moving through a press nip. A second layer of coating medium is applied indirectly with a second applicator implement onto an outer surface of a second rotating applicator roller from where it is transferred onto the previously coated side of the moving material layer while the first coat of coating medium is still wet.
摘要:
The invention relates to a coating device for coating moving webs of material, more particularly webs of paper or board, comprising a belt or hose (7), which is trained about the curved guide surface of a beam- or rod-like support member (1) and a drive roll (6), a cooperating roll (C) carrying the web, a coating gap (9) being defined between the cooperating roll (C) and the hose (7) for the application of the coating material to the web or the roll, a support beam (3), which extends in parallelism to the roll and the drive roll (6), for supporting the support member (1), and between the same a pressure hose (4) for the transmission of the support forces. The invention is characterized in that the support member (1) possesses a rib- or rail-like extension in its part remote from the curved guide surface at the gap (9), on which there acts a further pressure hose (5 and 5') arranged between a corresponding support surface on the support beam (3) and the extension of the support member (1), essentially in a direction which is transverse in relation to the direction of action of the first pressure hose (4 and 4'), the first pressure hose (4 and 4') being arranged essentially at the free end of the extension (2 and 2') of the support member (1 and 1').
摘要:
A device for applying a liquid to pasty medium to a moving surface, the moving surface in the case of direct application being the surface of a paper, board or other fibrous web. In the case of indirect application the moving surface being the surface of a transfer element which transfers the application medium to the surface of the fibrous web. The device includes an applicator for applying the medium and a doctor device arranged downstream in the running direction of the moving surface for doctoring off and/or equalizing the medium applied to the moving surface. In order to collect excess medium that has not remained on the moving surface and/or has not reached the latter, a flexible collecting part covering the interspace between applicator and doctor device is provided, which extends transversely with respect to the running direction of the moving surface and parallel to the applicator and the doctor device.
摘要:
An apparatus for direct or indirect application of liquid or pasty coating medium onto a traveling material web, notably of paper or cardboard, includes a paint curtain applicator mechanism and at least one sensor unit to register the flow quantity of the coating medium layer applied onto the material web and to provide a corresponding flow quantity signal. At least one regulation device regulates at least one manipulated variable of the paint curtain applicator mechanism upon which the flow quantity of the coating medium layer applied onto the material web depends. A control unit, which receives the flow quantity signal provided by the at least one sensor device, determines at least one face value for the at least one manipulated variable and controls the at least one regulation device on the basis of the at least one manipulated variable-face value.
摘要:
An applicator system roll for direct or indirect application of a coating medium onto a traveling fiber material web includes a core substantially comprised of a fiber composite material and a cover substantially surrounding the core.
摘要:
An apparatus and process prevents and removes obstructions in the discharge opening of a metering slot of a coating apparatus, or fountain applicator, applying a coating medium onto a moving material web. The process repeatedly removes obstructions from the discharge opening of the metering slot, thereby preventing defects in the applied coating. The apparatus includes a scraper disposed and translatory movable within the discharge opening in a direction transverse to the direction of movement of the material web.
摘要:
In an apparatus for the application of a liquid or pasty substance onto a traveling material web, notably of paper or cardboard, a doctor bar serving the metering of the applied substance is composed of at least two bar segments strung together in the longitudinal direction of the doctor bar and fixedly joined to one another. Possible thereby, in the manufacture of the doctor bar, is an easier handling and a better compliance with accuracy requirements.