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 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. Therefore, the basic structural group remains unchanged and selectively it may be modified to either an application chamber or a free jet nozzle dosing gap. In an alternate embodiment, the elements defining the dosing gap themselves can receive the attachable elements for defining the application chamber. This enables rearranging the application unit either to define an application chamber or a free jet nozzle with replacement of fewer parts, and generally the parts that are toward the surface.
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:
The invention is directed to an applicator for coating a traveling fiber web with a coating mixture. The applicator includes a backing roll having a shell surface for carrying the web, and a nozzle for feeding the coating mixture. The applicator includes a support beam; a nozzle which is integral with or connected to the support beam; and a doctor bar carried by the support beam. The doctor bar has a guide surface. The guide surface and the backing roll define a nip for producing a hydrodynamic pressure. The guide surface approaching the shell surface of the backing roll extends to an exit edge at a location nearest the backing roll. A device is provided for flexibly backing the doctor bar on the support beam.
摘要:
The invention relates to a guiding device for a continuous paper sheet comprising at least one guiding element which is disposed downstream with respect to an application group and used in the form of an air circulating channel in order to ensure a contactless guiding in a machine producing and/or processing a continuous material sheet, in particular a paper or paperboard sheet. Said guiding element consists of a guiding surface made at least partially of an air-permeable porous material which is exposed to a compressed air pressure in such a way that air can circulate therethrough, thereby forming an air cushion between said guiding surface and a moving material sheet.
摘要:
Disclosed are a process of and an apparatus for producing paper webs coated on both sides, in particular so-called LWC-papers, in a paper making machine. Firstly, one side of the paper web (1) is coated in a first coating station (8) and then dried. Subsequently, the other side of the paper web (1) is coated in a second coating station (25) and then dried. Each coating station (8, 25) includes an application role (10), an opposing roll (11) and an application unit (13) arranged on the application roll for indirectly coating the paper web. The metering of the coating mass on the application roll (10) takes place by means of a smooth roll doctor. The coated paper web (1) is calendered by means of an on-line calendering unit (60).
摘要:
An application apparatus is for applying a liquid or pasty medium to a moving base. The moving base is a surface of a material web in a case of direct application and a surface of a transfer element for transferring the medium to the material web in a case of indirect application, the material web being one of paper and cardboard. The application apparatus has an inlet side and an outlet side with respect to a direction of movement of the moving base. The application apparatus includes a carrying beam; an essentially rigid supporting unit provided on the carrying beam; a sealing doctor device positioned at the inlet side of the application apparatus, the sealing doctor device being fixedly attached to the supporting unit; and a metering doctor device positioned at the outlet side of the application apparatus, the metering doctor device being fixedly attached to the supporting unit. The sealing doctor device and the metering doctor device define an application chamber therebetween.
摘要:
A device designed for coating a material web with a coating medium includes a coater, a metering/smoothing device positioned downstream of the coater in the direction of feed of the material web, at a certain distance from the coater, and a support roll around which the material web is guided. Moreover, the material web is guided around the support roll only in the area of the metering/smoothing device, and it traverses essentially in a straight line between the coater and the support roll. In accordance to a first aspect of this invention, a support arrangement supports the material web in the straight web section between the coater and the support roll. In accordance to a second aspect of this invention, devices are provided which stabilize the material web in the area where the web traverses in a straight line.
摘要:
The invention relates to a device and a method for the stabilization of the position of cameras, and for the production of film recordings from unmanned airborne objectsAn position stabilization system for a camera suspended in a motor-driven pivot device so as to be able to pivot the same about multiple axes, comprising rotary sensors or angular rate sensors and a closed-loop control, wherein the assignment, the coupling degree, and/or the effective direction of the signals in the control path from the angular rate sensors to the motors can be variably controlled by means of a cross-fade circuit as a function of the relative orientation of the measured rotational axes to the driven rotational axes. The invention further relates to special mechanical embodiments of the pivot device.
摘要:
An aid for remotely controlling unmanned aircraft and particular helicopters, which allow the pilot at least approximately to directly stir the angle of inclination, thus for instance a pitch(elevator) and/or roll angle, so that on neutralizing of the steering stick, the respective angle of attitude returns autonomously, and to a large extent goes back to the horizontal position. To this end, a closed-loop control of the inclination is carried out, in that an angular rate signal is being integrated to an actual value, and a nominal value is admixed behind the forming of the integral, wherein the time of integration is shortened in order to avoid null drifts, in particular by feeding a portion of the actual value and/or the nominal value back into the input of the integrator. Furthermore, a vectorial rotation of the integrated actual values by a yaw signal.