公开(公告)号：EP1012386A1

公开(公告)日：2000-06-28

申请号：EP98917149.1

申请日：1998-04-21

申请人： VALMET CORPORATION

发明人： LIPPONEN, Juha ,  SALMINEN, Martti ,  KAIHOVIRTA, Juha ,  KERTTULA, Reima

IPC分类号： D21F5/04

CPC分类号： D21F5/04

摘要： A method and an equipment for evaporation drying of the paper web that comes from the press section (10) of a paper machine. The method consists of three successive stages I, II and III that are carried out in the direction of progress of the web (W) as follows: (I) in the first stage, the paper web coming from the press section (10) of the paper machine is heated in a short section (L1) of the paper machine in the machine direction quickly to a temperature of 55...85 °C, and web breaks of the relatively moist and, thus, weak web (W) are minimized; (II) after the first stage (I), the main evaporation drying of the web (W) is carried out so that the evaporation efficiency (PE) and the rate of increase in the dry solids content (KA) of the web (W) are substantially higher than in the first stage or in the final stage (III), and the web temperature (TW) does substantially not rise while the drying proceeds (Fig. 4); (III) in the final stage, the drying is continued with a decreasing evaporation efficiency (Fig. 3) and with such an average rate of increase in the dry solids content (KA) of the web (W) in the machine direction as is lower than in the preceding stage (II) but higher than in a conventional cylinder drying with single-wire draw so that the paper quality can be controlled at the same time.

公开(公告)号：EP1086271A1

公开(公告)日：2001-03-28

申请号：EP99955509.7

申请日：1999-05-27

申请人： VALMET CORPORATION

发明人： KERTTULA, Reima

IPC分类号： D21F9/00

CPC分类号： D21F9/006 ,  D21F5/00

摘要： The invention concerns an integrated paper machine, which comprises, in the running direction of the web, a multi-layer headbox (100), a gap former (200), in which there is at least one pre-press (303, 304), a press section (300), in whcih there is at least one extended-nip press (308, 309), a pre-dryer section (400), in which the web (W) is dried by means of a high-capacity dryer unit, a dryer section (500), in which there is at least one dryer group (R1, R2, R3) which makes use of single-wire draw, as well as a surface treatment device (P) for the web. Further, the paper machine is provided with a closed web draw at least to the end of the dryer section (500).

公开(公告)号：EP0840821B1

公开(公告)日：2000-11-29

申请号：EP97917325.9

申请日：1997-04-21

申请人： VALMET CORPORATION

发明人： LINSURI, Ari ,  KERTTULA, Reima ,  KIVIOJA, Pekka ,  NYBERG, Timo, R.

IPC分类号： D21G1/00

CPC分类号： D21G1/006 ,  D21G1/0026 ,  D21G1/0066

摘要： The invention relates to a method in the calendering of a paper web, wherein the paper web (W) is passed through a calendering nip (N) formed by two rolls (11, 12). Of the nip rolls at least one roll (12) has been made soft-faced by means of a coating (13) of a polymer or equivalent material or by means of a band passed over said roll and running through the nip (N). The profile of the calendering nip (N) is regulated in order to compensate for any flaws present in the web (W) entering the calender (10), and in the invention the regulation of the profile is carried out during the running of the machine by varying the properties of the coating (13) or, correspondingly, of the band on the soft-faced roll (12) locally in a direction transverse to the machine direction. Preferably, the properties of the coating (13) or the band are varied by means of heat. The invention also relates to a calender that makes use of the method.

公开(公告)号：EP0840821A1

公开(公告)日：1998-05-13

申请号：EP97917325.0

申请日：1997-04-21

申请人： VALMET CORPORATION

发明人： LINSURI, Ari ,  KERTTULA, Reima ,  KIVIOJA, Pekka ,  NYBERG, Timo, R.

IPC分类号： D21G1

CPC分类号： D21G1/006 ,  D21G1/0026 ,  D21G1/0066

摘要： The invention relates to a method in the calendering of a paper web, wherein the paper web (W) is passed through a calendering nip (N) formed by two rolls (11, 12). Of the nip rolls at least one roll (12) has been made soft-faced by means of a coating (13) of a polymer or equivalent material or by means of a band passed over said roll and running through the nip (N). The profile of the calendering nip (N) is regulated in order to compensate for any flaws present in the web (W) entering the calender (10), and in the invention the regulation of the profile is carried out during the running of the machine by varying the properties of the coating (13) or, correspondingly, of the band on the soft-faced roll (12) locally in a direction transverse to the machine direction. Preferably, the properties of the coating (13) or the band are varied by means of heat. The invention also relates to a calender that makes use of the method.