Abstract: A method and apparatus for feeding a treating agent to an apparatus (1, 2) employed in the treating of a paper or board web for applying the treating agent to the surface of the web being treated. The treating agent is prepared and then supplied to the apparatus used for applying the treating agent, into the applicator chamber thereof, wherefrom the treating agent is further applied to a moving surface. The treating agent is first supplied into a feed chamber (2) communicating with the applicator chamber, and the feed chamber (2) is provided with a shunt line (10, 11) serving to remove the excess amount of the treating agent supplied to the feed chamber (2) that is not adhered to the moving surface. A pressure measurement signal at a point (22) representing the internal pressure of the feed chamber is obtained, and the feed pressure of the treating agent is adjusted to a value causing the internal pressure of the feed chamber to attain its desired set value.

Abstract: An assembly is disclosed for an apparatus used for deaeration of treatment agents applied to webs of paper and board, the assembly comprising at least one inlet manifold (3), at least one accept-fraction manifold (4), and at least one reject-fraction manifold (5) with associated framework structures; also a method is disclosed for operating the assembly. For deaeration the assembly uses a plurality of air separator units (12) connected to the manifolds so as to allow admission of the treatment agent to the air separator units (12) from the inlet manifold (3) and discharge of the accept and reject fractions formed in the air separator units (12) respectively to the accept-fraction and reject-fraction manifolds (4, 5).

Abstract: The present invention relates to a method and apparatus for measuring the properties of a composition or a component thereof used in the processing of a paper or board web. According to the invention, a sample of the composition to be measured is taken into a measurement apparatus, the composition is measured at least for its density, viscosity, dry solids content and gas content, and is then passed out from the measurement apparatus.

Abstract: The invention relates to an improved separation device in which a plate unit containing the filter comprises a separate abutment ring and a cassette which can be easily connected thereto, said cassette comprising at least one filter together with, if required, a frame belonging thereto so as to support the filter. If the filter consists of a flexible membrane, this is fitted into a special frame. However, if the filter is a rigid self-supporting filter of a porous material, for example, a ceramic filter or the like, a separate frame is not needed to support the filter.

Abstract: A method and apparatus for separating foreign material from coating mix flow circulating in the machine circulation of a coating station (7) in coaters used for coating a web of paper or board. Coating mix is conveyed from a tank (1) to a coating station, where it is applied to the surface of the web to be coated, and the excess of the coating mix conveyed to the coating station (7) is returned to the tank (1). The coating mix flow incoming from said tank (1) to the coating station is screened by at least one pressure screen (5) and the rejects fraction of the coating mix flow is discharged from the pressure screen (5). A portion of the coating mix flow circulating in the machine circulation is passed through a vibrating screen (13) and the accepts fraction of the vibrating screen is returned back to the machine circulation. The invention offers high efficiency in the removal of elongated foreign matter particles from the machine circulation of coating mix.