| 摘要 |
A press with extended nip for paper or board machines, comprising a support means (2); a pressure means (4) disposed opposite the support means (2), designed to be secured to a stand (9), and comprising a press shoe (5) which, together with the support means (2), forms a pressing zone with extended nip; at least one belt (3), impervious to liquid, which passes through the pressing zone in sliding contact with the press shoe (5); and at least one endless, liquid-absorbing felt (6), which passes through said pressing zone together with a fiber web (1) to be dewatered, said pressure means (4) comprising jacks (14) disposed in at least one row across the belt (3) and acting on the press shoe (5) to force it against the support means (2). According to the invention the pressure means (4) comprises an elongate jack unit (15) disposed transversely across the belt (3) and comprising a block (16) with cavities (17) for the pistons (18) of the jacks (14) and a top element (19) closing the cavities (17) and being provided with apertures (20) for the piston rods (21) of the jacks (14), said piston rods acting on the press shoe (5). |
