Abstract: A method for manufacturing a cutting blade, which cutting blade is meant particularly to be used as a rotating cutter blade and, which is manufactured from a blade preform, being provided with a cutting surface. The blade preform includes a frame part, being made of a basic material and in which on an attachment surface, existing essentially at a cutting area of the cutting blade to be manufactured, is processed at least a wear resistant material layer that forms the cutting surface. The layer includes steel that is alloyed with tungsten or chromium and vanadium. A cutting blade, being manufactured according to the method, and use of an auxiliary material in manufacturing thereof.

Abstract: A method in connection with laser use, wherein one or more laser beams emitted by one or more laser sources are focused by beam guiding elements on a fusing spot. A filler delivered to the fusing spot is melted, especially for performing a welding, coating, and/or piece manufacturing process. The filler includes a substantially solid-state, elongated filler material that is fed by a delivery system to the fusing spot. The fusing spot is centrally located relative to the one or more laser beams focusing on the fusing spot. The one or more laser beams are diverged with a multi-segment mirror, especially for maintaining the symmetry of the intensity distribution thereof, whereby beams or divisional beams, reflecting from its various segment elements in substantially divergent directions, are converged on the fusing spot by a condenser system included in the beam guiding elements.

Abstract: An apparatus for purifying water, that includes a frame, in connection with which is arranged a primary space for water to be filtered, secondary space for filtered water and a filter. The filter is arranged to filter water, that is driven by gravity from the primary space existing in the frame to the secondary space, wherein the filtering influence of the filter is based essentially on a thin filtering film made of plastic based material. Essentially underneath the primary space is arranged an accessory space for the filtering means, that is in connection with the primary space and that has an essentially smaller cross-section than the same, in order to keep the filter surrounded by unclean water in the auxiliary space of the primary space, being limited from the secondary space, totally separate from the secondary space.

Abstract: The invention relates to a purifying device for liquid, that has filtering means (1) in order to separate impurities in the liquid to be treated by mechanical filtration and purifying means (2), such as an activated carbon element or like, in order to eliminate impurities in the liquid to be treated by absorption or correspondingly, which means (1, 2) are arranged essentially built-in therein. The mechanical filtering means (1) are carried out by a thin filtering film (1a) made of plastic based material, such as PTM (Particle Track Membrane), TeM (Track-edge Membrane) or like, the porosity of which is 5-15%, the thickness preferably 10-25 &mgr;m and the size of pores 0,5 &mgr;m at its height.

Abstract: An apparatus for purifying water, that includes a frame (1), in connection with which is arranged a primary space (1a) for water to be filtered, secondary space (1b) for filtered water and filtering means (2), which filtering means (2) are arranged to filter water, that is driven by gravity from the primary space (1a) existing in the frame to the secondary space (1b), wherein the filtering influence of the filtering means is based essentially on a thin filtering film (2a) made of plastic based material. Essentially underneath the primary space (1a) is arranged an accessory space (1a1) for the filtering means (2), that is in connection with the primary space and that has an essentially smaller cross-section than the same, in order to keep the filtering means (2) surrounded by unclean water in the auxiliary space (1a1) of the primary space (1a), being limited from the secondary space (1b), totally separate from the secondary space (1b).

Abstract: The water purification device includes at least a purification unit and a pipe unit. The water purification device is intended for purification of water being particularly in a storage, such as a container, a reservoir, a vessel or the like, by immersing the same at least partly into the water existing in the storage and by leading water away from the storage preferably from above into a collecting container placed essentially underneath the purification unit. A pipe connected to the purification unit is arranged to lead water by means of syphon principle, by influence of syphon pressure caused by the difference between the height of the purification unit and the collecting container. The filtering means include at least one thin filtering film, preferably made of plastic-based material, such as PTM (Particle Trade Membrane), TeM (track-etch Membrane) or the like, the thickness of which is preferably 7-25 micrometers and the size of pores is 0.05-10 micrometers.

Abstract: The invention relates to a method for treatment of liquid, that is meant particularly for filtering of pressurized liquid, such as water led from a water distribution system, by way of an apparatus, which has an essentially closed frame (1), in connection with which there has been arranged at least a filtering device (2) for purifying of liquid and a flow device (3), such as feed-flow and/or exhaust flow arrangements (3a, 3b) for leading of liquid. The filtering device (2) is made of thin filtering film (2a), advantageously made of plastic based material, such as PTM (Particle Track Membrane), TeM (Track-etch Membrane) or like, the thickness of which is preferably 7-25 &mgr;m and the size of pores of which is 0.05-10 &mgr;m. The filtering film (2a) belonging to a filtering device (2) are being purified essentially self-powered, such as by way of a purification device (5) exploiting the pressure (p) or the movement (v1) of the liquid to be treated and/or the liquid that has been treated.