公开(公告)号：EP1060308A1

公开(公告)日：2000-12-20

申请号：EP98958272.1

申请日：1998-12-03

申请人： VALMET CORPORATION

发明人： NIKULAINEN, Osmo ,  KARTTUNEN, Heikki ,  LEINONEN, Antti ,  KIVIRANTA, Seppo ,  VILLGREN, Hannu ,  KETTUNEN, Miikka ,  SALMINEN, Samppa, J.

IPC分类号： D21F3/10

CPC分类号： F26B13/16 ,  D21F3/10

摘要： The invention relates to a roll for a paper or board machine comprising axle journals on whose support the roll is arranged to revolve, end flanges with which the axle journals are connected, and a mantle which is connected with the end flanges. The mantle is provided with a number of openings extending through the mantle and/or recesses (15) formed into the outer surface of the mantle, which openings and/or recesses form a regular pattern. Solid connecting portions in the outer surface of the mantle around said openings and/or recesses (15) are opened so that, from each opening and/or recess (15), there is a connection, provided in the form of a groove or an additional recess (16, 17) extending into the outer surface of the roll mantle, with at least each of the openings and/or recesses (15) closest to it.

公开(公告)号：EP0912798A1

公开(公告)日：1999-05-06

申请号：EP97948933.0

申请日：1997-12-22

申请人： VALMET CORPORATION

发明人： SNELLMAN, Jorma ,  POIKOLAINEN, Antti ,  PUURTINEN, Ari ,  SALMINEN, Samppa, J.

IPC分类号： D21F1

CPC分类号： D21F1/52

摘要： The invention concerns a suction box in a paper machine, comprising a vacuum chamber (21), a deck or a number of substantially U-section holders (24) open towards the wire or equivalent, and a number of ribs (22), which have been fitted in said deck or in said holders (24) so that they can be loaded against the wire or equivalent by means of loading means (23). At least in a running situation, the deck of the suction box (20) or the position of the ribs (22) is curved so that the wire tension lowers the normal force which is produced by the vacuum present in the suction box (20) and which is effective between the wire and the deck/ribs (22). Further, the invention also concerns a method in a suction box in a paper machine, wherein a vacuum is formed in the vacuum chamber (21) of the suction box (20) and, during formation of the vacuum, the deck and/or the ribs (22) is/are pressed against the wire or equivalent. In the method, at least in a running situation, the curve form of the deck of the suction box (20) or of the position of the ribs (22) is such that the wire tension lowers the normal force which is produced by the vacuum present in the suction box (20) and which is effective between the wire and the deck/ribs (22).