Förfarande för framställning av en silprodukt och genom förfarandet fr amställd silprodukt

摘要

PCT No. PCT/FI92/00263 Sec. 371 Date Jul. 18, 1994 Sec. 102(e) Date Jul. 18, 1994 PCT Filed Sep. 30, 1992 PCT Pub. No. WO93/07384 PCT Pub. Date Apr. 15, 1993The invention relates to a method of manufacturing a screen product and to a screen product manufactured according to the method. In particular, the invention relates to the manufacture of a screen or a filter plate or a cylinder by a new machining method by which a product receives flow properties substantially better than the ones of the prior art devices. It is characteristic of the invention that an aperture having curved wall surfaces is machined in one work phase in the plate in the depth direction. It is characteristic of the screen product of the invention that the screening aperture is progressively widened in the direction of the flow through the plate, and preferably inclined under the ridge adjacent the groove in a plate.