公开(公告)号：EP1099025A1

公开(公告)日：2001-05-16

申请号：EP99931318.2

申请日：1999-06-22

申请人： Valmet Corporation

发明人： HEIKKINEN, Antti ,  TANI, Mikko ,  LINNONMAA, Pekka

IPC分类号： D21H23/30 ,  D21H25/04

CPC分类号： D21H23/30 ,  D21H23/26

摘要： In the method for treating the surface of the web, liquid is added on the surface of a paper or paperboard web (W), possibly with other constituents. The absorbency of the surface of the paper or paperboard web is increased before liquid is brought on the surface of the web or simultaneously with bringing the liquid on the surface of the web. The method is used for wetting the surface of the web before calendering, or for coating the web in surface sizing or pigmenting. The absorbency of the surface is increased before bringing the liquid for example by means of a corona treatment, a flame treatment, an ozonization or by adding steam.

公开(公告)号：EP1097269A1

公开(公告)日：2001-05-09

申请号：EP99934759.4

申请日：1999-07-12

申请人： Valmet Corporation

发明人： LINNONMAA, Pekka ,  HEIKKINEN, Antti

IPC分类号： D21G7/00 ,  D21F5/00

CPC分类号： B65H20/00 ,  B65H37/00 ,  B65H2301/5142 ,  D21F5/00 ,  D21G1/0093 ,  D21G7/00

摘要： In the method for manufacturing surface-treated printing paper, a paper web is first dried down to a target moisture of the surface treatment, and it is wetted again to the target moisture before the surface treatment. The re-wetting to the target moisture is conducted on the web running to the surface treatment before a device effecting the surface treatment of the web, as seen in the travel direction of the web. Before re-wetting, the moisture profile of the web is adjusted in the drying section by wetting the web at a point which is located before the area of the heavy shrinkage (cd shrinkage area) in the travel direction of the web.

公开(公告)号：EP1105570A1

公开(公告)日：2001-06-13

申请号：EP99934760.2

申请日：1999-07-12

申请人： Valmet Corporation

发明人： LINNONMAA, Pekka ,  HEIKKINEN, Antti

IPC分类号： D21G7/00 ,  D21F5/00

CPC分类号： D21G7/00 ,  B65H20/00 ,  B65H37/00 ,  B65H2301/5142 ,  D21F5/00 ,  D21G1/0093

摘要： In the method for manufacturing calendered paper, paper is calendered after drying. The paper is dried (D) down to a moisture lower than the target moisture of calendering. The paper is run via wetting (1) to calendering, wherein at least one of the surface layers of the paper is wetted in the wetting in such a way that the moistening water is absorbed in the surface layer of the paper while at least the central part remains substantially dry. From the paper wetted at least on one of its sides, gradient paper is manufactured by means of gradient calendering by restricting the paper-moulding effect of the calender to the wetted surface layer in such a way that at least the central part of the paper is elastically restored substantially in its original state, whereafter the obtained gradient paper is reeled.

公开(公告)号：EP1017905A1

公开(公告)日：2000-07-12

申请号：EP98920558.8

申请日：1998-05-07

申请人： VALMET CORPORATION

发明人： MÄENPÄÄ, Tapio ,  LEINONEN, Erkki ,  KIVIOJA, Pekka ,  EHROLA, Juha ,  HIRSALMI, Iikka ,  LINNONMAA, Pekka ,  KOIVUKUNNAS, Pekka ,  VILJANMAA, Mika

IPC分类号： D21G1/00

CPC分类号： D21G9/0045 ,  D21G1/00 ,  D21G1/004

摘要： The invention concerns a method and an arrangement for computing and regulation of the distribution of linear load in a multi-nip calender. The material web (W) is passed through the nips (N1...N9) in the set of rolls (12), which set of rolls comprises a variable-crown upper roll (13), a variable-crown lower roll (14) and intermediate rolls (15...22) fitted between the upper and lower rolls (13, 14). All the rolls in the set of rolls are supported so that, when the nips (N1...N9) are closed, the bending lines of the rolls are curved downwards. In the computing and regulation of linear loads, the physical properties affecting the bending of each intermediate roll (15...22) under load, such as bending rigidity, mass, shape, and material properties, are taken into account. The ratio of the linear loads applied to the intermediate rolls (15...22), the own weight of the rolls, and of the support forces applied to the rolls is regulated so that the set of rolls is in a state of equilibrium and in a predetermined state of deflection. The invention also concerns a multi-nip calender that carries out the method.