Abstract: The invention concerns a method and a device in a paper machine, coating machine, intermediate winder, unwind stand of a slitter-winder, or in any other device for treatment of a web. In the event of disturbance, the web (P) is made to be wound in a controlled way around at least one web guide roll (18a).

Abstract: A method and apparatus for determining the profile of a coating layer of a paper or board web (2). The method comprises application of a coating slip to at least one surface of the web (2) at the coating head (1) of a coating machine, the measurement of the transverse temperature profile of the web (2) surface in at least a measurement point (7, 8) fitted after the coating head (1), and the determination of the profile of the web's (2) coating layer on the basis of the temperature profile measured in at least the measuring point (7, 8) fitted after the coating head (1), whereupon a change in the temperature of the web's (2) coating layer or in the difference of the temperature between the coating layer and the base web (2) is at least almost proportional to the change in the coat weight.

Abstract: The invention concerns a method and a device in a paper machine, coating machine, intermediate winder, unwind stand of a slitter-winder, or in any other device for treatment of a web. In the event of disturbance, the web (P) is made to be wound in a controlled way around at least one web guide roll (18a).

Abstract: The object of the invention is a method for defining the profile of a coating layer of a paper or board web (2). The method comprises application of a coating slip to at least one surface of the web (2) at the coating head (1) of a coating machine, the measurement of the transverse temperature profile of the web (2) surface in at least a measuring point (7, 8) fitted after the coating head (1), and the definition of the profile of the web's (2) coating layer on the basis of the temperature profile measured in at least the measuring point (7, 8) fitted after the coating head (1), whereupon a change in the temperature of the web's (2) coating layer or in the difference of the temperature between the coating layer and the base web (2) is at least almost proportional to the change in the coat weight.

Abstract: The invention concerns a method and a device in a paper machine, coating machine, intermediate winder, unwind stand of a slitter-winder, or in any other device for treatment of a web. In the event of disturbance, the web (P) is made to be wound in a controlled way around at least one web guide roll (18a).

Abstract: The invention concerns a method and a device in a paper machine, coating machine, intermediate winder, unwind stand of a slitter-winder, or in any other device for treatment of a web. In the event of disturbance, the web (P) is made to be wound in a controlled way around at least one web guide roll (18a).

Abstract: The invention concerns a method and a device in a paper machine, coating machine, intermediate winder, unwind stand of a slitter-winder, or in any other device for treatment of a web. In the event of disturbance, the web (P) is made to be wound in a controlled way around at least one web guide roll (18a).

Abstract: Method and apparatus for guiding a paper or board web in a paper manufacturing machine, a board manufacturing machine, or finishing units in connection with such machines. Web travel is guided by changing the travel position of at least one wire travelling in contact with the web such that the velocity vector of the wire at least at the point of contact of the web and the wire is directed sideways from the travel direction of the web center line when the web is brought onto the wire.

Abstract: A method and apparatus for producing paperboard, the method comprising the steps of applying a coating mix layer having a thickness greater than that of the final coat thickness to the surface of the web being coated using a coating mix formulation in which the solids content is at least 55%, passing the web with the coat applied thereto to a doctor blade located downstream in the travel direction of the web at a distance from the applicator apparatus such that the dwell time from the application step of the coating mix to the doctoring step is at least 130 ms, and smoothing the coat layer to its final thickness by means of a doctor blade. By this method a smooth surface can be obtained even on high coat weights.

Abstract: The present invention relates to a nozzle device for use in a spray coating station designed for coating a paper or board web, said device comprising a nozzle device body (1), a replaceable nozzle piece (2) and clamping member and actuator (3,4) suited to lock said nozzle piece (2) to said nozzle device body (1). New nozzle pieces (2) are stored in a nozzle replacement apparatus (5,6) which facilitates rapid replacement of an in-use nozzle piece (2). In the replacement operation, the clamping member and actuator (3,4) serving to lock said nozzle piece (2) are first actuated in order to release said nozzle piece whereafter the worn nozzle piece (2) is removed with the help of transfer member (6) and a new nozzle piece (2) is moved to the nozzle device, and finally said new nozzle piece (2) is locked by said clamping member and actuator (3,4) to said nozzle device body (1).

Abstract: A method and assembly for coating a moving web of paper or paperboard by means of a coating mix jet which is directed to the surface of the web without mechanical support. The present invention is based on applying a desired amount of the coating mix to the web via a narrow-gap slit orifice, and by measuring the coat weight on the web, adjusting the position of at least one lip of the slit orifice to achieve the desired weight and cross-machine profile of the applied coat.

Abstract: A method and apparatus for controlling the coat profile in short dwell time coaters and similar apparatuses in which the coating mix is applied to the web, over a brief time interval, in an application chamber disposed immediately upstream of a doctoring element. Excess coating mix flows counter to the running direction of the web over the front edge of the application chamber. The distance between the web and the front edge of the coating chamber is adjustable, allowing the cross-machine profile of the coating to be controlled.