CA2182569A1 - Wire section for a paper machine - Google Patents
Wire section for a paper machineInfo
- Publication number
- CA2182569A1 CA2182569A1 CA 2182569 CA2182569A CA2182569A1 CA 2182569 A1 CA2182569 A1 CA 2182569A1 CA 2182569 CA2182569 CA 2182569 CA 2182569 A CA2182569 A CA 2182569A CA 2182569 A1 CA2182569 A1 CA 2182569A1
- Authority
- CA
- Canada
- Prior art keywords
- felt
- forming cylinder
- wire
- wire section
- cylinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F9/00—Complete machines for making continuous webs of paper
- D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
Landscapes
- Paper (AREA)
Abstract
The invention relates to a wire section for a paper machine comprising a forming cylinder (1), a felt (2) and a wire (3), both wrapping around the forming cylinder (1), with the felt (2) disposed on the inside and the wire (3) on the outside, and forming a gap (4) for receiving a machinewide jet of stock suspension or a pre-dewatered paper web; the forming cylinder has a rotatably mounted perforated shell. The invention is characterized by the following features: at least part of the wraparound zone of the forming cylinder can be pressurized from the inside.
Description
StNT ~Y:Xerox Telecopier 7~2~ ; 7-19-96 ; 14:22 ; BAKER&DANIELS~ ;~ 3 21825~9 WIRF. S~-~TION FOR A p~PFl~ ~IACHINE
The inventio~ relates to a wire section for a paper In~Ghtne accor~g to the preamble claim 1.
Double ~ire sections a~e hlown in ma~y varia~ts. R~f~el~cc is S made to ~e m~gfl~in~ "Das P~ier," No. lOA, Vol. 1991~ pp. ~ 100 f~.
Accordwg to it, there are so-called roll f~ e,~ us~ exclu~i~,el~
rolls as d~ t~ g e1etn~nts~ FUL(1 c ~ re~ there ~re blade fol~e,~
slats arranged ~ e.ge to ~he m~rllin~ direction, as de~vate,~g elements.
0~ m~R~hi~s wi~ ho~ al sheet fo~g sect;on the ~ ce roll of ~e top w~e, i.e., the roll c~. jil~g the top ~ to ~e bottom wire, can ~1P,O be ~Tanged at a ce~ ho~ hn~e from ~he e~ roll of ~e bottom wire. This crea~es a pre-de..~l~g s~etch (~o-called hybnd former). R~ic~lty, ~uch offset b_t~.e~ the c.,lh~cc rolls of the two wire~ are possible also in a mRchin~ w~ veffical sheet ~ormi~g. In most ca~s, ~..~,.~,., l~e two e~c~ rolls, L~ the lattcr type of m~chin~.g~ are located ap~lo~.."Rtely ~ ~c same hu,~4ll~al pla~e.
These m~rhines are also called gap r~ e.~.
Also k~own (U.S. 3,378,435) is ~ a w~re and a felt, i~ of 20 two ~res, Bo~ belt~ wr~ aro~d the form~Ilg ~li-ld~r. The felt i8 disposed on t~e inside in the wl~p&~u~d, i.e., directly on the shell surface of ~e ~ 8 cylinder, ~h~ieas the wire ~vraps around the fo~ 8 cylinder on ~e outsi~e. C~ n~d between these two, in tur~, is ~e pa~er web, sandwiched b~ elt a~d wire. In ~his case? i.e., when 25 using a felt, the fnrmin~ cylinder has a continuous shell ~lrfAce.
To accon~rl;ch w~ a ~o c~lled former a good sheet f~ ;on, ~e ~elt must not nul on ~he forrning cylinder too dry. The felt even L~
sn(~u~1hd ~ith water in many ca~es. But such hi&h water content in the felt has a nc~,aL-_ e~ect o~ the fflo~sture content o the paper web.
30 Namely, the felt--along with the paper web lying on it ~r clirlgjr~g to it --contiml~s to run along after leaving the forming cylinder.- The t vo are SENT BY:Xerox Telecopier 702~ ; 7-19-96 ; 14:23 ; BAK~R~ANl~L~
a ~ ~ 8~i6~) passed ~rough a roll pres~, where ~ey arrive ur~ a relatively high wat~ colltent. It goes wi~out say~ng tha~ the exit water conte~t of felt a~d paper web will be t~e higher the higher the entra~ce water content at C-lt~ ;~ the press nip. Thus, the l,l~cc of water in the felt pnor to 5 w~ g around the fo,~ e cyl~nder, for one, is ~ for a fla~les~ wu,king of the fo~ g cylinder but, for another, it is u~ble whe~ l~e objective is achie~ a m~im~lly hig~ L~ei.j of ~e paper web pass~ng the pre~s nip.
The obje~ underlying the in~rentton i9 to design a wire section 10 acco~di~ to ~e p~eamble of claim 1 in a fashion such that the felt, as it wraps around the for~ g cylinder, for one, holds ~fft~iellt ~ater to be ~ble to ma~ter the formi~ job but, for ano~er, th~t it holds as lit-tle water a~ po~ihle i~ view of a minim~l water col~tent aflter e~u~g ~om the following press(es).
lS This objc~i~e is met by ffle ch&~ g ~.-t~ of claim 1.
In doing so, th~ ill /~or chose an avenue ~hat is completely cou~ . to the classic notion. ~tead of e2~posing the felt on it~ path in ~ap~g ~rou~d the fo,~~ d~ to a ~uum, in order to wi~hdraw ~v~ter from ~e felt ~nd pass it to the interior ûf the formirlg ~iyli~d~r for removal, provi~ions are that ~e felt be ~A~csed to p~e ~n the area of ~e wi~roul~d zone of ~e fo~ cyli~der (or at least part of tha~
~ ,~ouild ~rea). At the ~ame time, the finrn~i1tE ~ d~ i~ f~al~d, which aclii~ es that the ~lc~ forces the ~er co~ P~ in ~he felt to its radially oute~ s~ace in the ~a~ d~ and thu~ to the bound~y 2S su~ace ~vith t~e paper w~b. This assures a ~ffi~ ie~ er content ~ the ~rea of this bo~dasy s~ di~is~ y~ it me~ns t~at the felt overall - after leavi~g ~e fo~ cylinder ~ has a relatively low content of water. Hence, relati~rely lit~e water needs tû be r~ ,~e~ ftom ~e felt by the press(es). The dry~ess of lhe felt ex~ting the pre~s section i~ ~us rdatively hi~h, as cû~ed to prior art embo~ . Along with it, ho~ , also the dryness of the paper web be~cs rather high, ~ince SENT BY:Xerox Telecopier ~02C ; 7-19-96 ; 14:23 ; BAKER&DANI~LS~ ;~ 5 2 18~S69 ~e relatively dry felt can pick up, in ~e press ~ecti~n, much more water ~om ~he paper weS than a moist felt accoi~ing to ~e prior art Besides the said advantQges achieved by the inven~o~ it i~8 quite co~ ble that the iIIVentiQn~l al~p~ ti~n of ple~ t~8 in the S fiber fleece slight fiber mo~e.~ and that, hence, the fiber o~ !n peIpen~icul~r to the p~per surface is il~uenC~. The ~li~m~nt of an i~dividual fiber can hence be ...nu ,~A in ~ direc~on from the one pap~ side to the other. This ~llows i~n~e~ favorably, for ~d..~r~lc, the softnes.~ of a ~sgue paper.
The appliç~tion of press~e need not be c~ried out absolutely wi~ a~r. Congider~tiQn may ~c given ~lso to other mf,~ mq, ~or eY~n~ple ~team. Using differen~ ,s ~1l0~B ~ the ~iscosity of t~e wa~er co~t~ ~ ill the fiber fleece, ~us ;~ f l~Cit~ the de~at~.~g behavior.
Collcei~le is also ~e use of medium~ mixed wi~ nlic~ for in~pnee for felt When subdividing the p,~ ne l,~ e to the ~c-h;
~mning di~ ~ the option of applying di~ l plOS~,i. to the indi~idual zones created beeo~cs ava~labla This ~llow~ controlling o~
20 regnl~tin~ ~he u oi~tu~ crosæ pro~le of t~e pa~er web being creatcd.
The invention i~ more fiJlly erpls:necl with the aid of the drawing.
Fig. 1 æhows a double w~re fosmer con~r~Q;~ a fol~fi~g c~ de.
1, felt 2 ~lapping a~ound the fc~nnmg ~li~de. 1 ~lld be~ ~ r on its ~ell 9~ , as well as a wire 3 w~ round ~e fo ing 2S cylinder 1 as well, but be~ng di~ed o~ the outside in ~e wl&~rou~d.
Felt 2 ~nd wire 3 fonn a c~eifolm e~ e g~p 4. Said c ~ ce gap 4 receives a m~l~.hin~de jet of stock ~ ion issuin~ out of a headbox.
Ill~led of said headbox is merely its slice nozzle 5.
Felt 2 and wire 3 proceed then ~ough fi~he~ form~ng secti~n~
30 coL~.l)osed of flexibly mounted as well a~ rigdly a~l~ge~ slats. La~tly, ~e paper web 8 (das~ed), ~ow formed, is carr~ed off with the felt and SENT BY:Xerox Telecopier 7~2~ ; 7-19-96 ; 14:24 ; BAKE~&DANIELS~ ;~ 6 4 21~?S69 p~sed ~rough a press 11 (Fig. 2) or 1lA (Fig. 3) and ~T~n~ferred to a drying cylinder 12. The said slats ~re not illua~
Decisive is that the fonring cylinder 1 accor~i~g to the invendon feature a pre~ wne 1.1 co..~ev~l, ~.g., to a CO~lC~Cd ~ir source 10 5 and bvu~dcd favorably by a ~phon~ry pacL ;1~ carrier 9. Besides, lhe shell of f~.. ;.~g cylinder 1 is provided wi~h a plura~ty of bore~ 1.4 (Fig.
4). Thus, the said ~ re pr~ceeds onto the felt 2, ~e pape~ web 8 be~ created, and tihe ~e 3. Water ~ c;l ul the felt 2 is ~.crul~, forced ~ulw~d radially. Part of tlle w~ pr~eds ~rough ~e paper 10 web 8 and, toge~er ~ the water f~om the supplied jet of stock ~;on, through ~e w~re 3 iIltO a collection box 7 SullOUi~lg the aro~d zone (Fig. 3).
~ d~1it;QI-~I possible ~ t~ in Fig. ~ and 3. The fol~g cylinder r~dtul~o in each ca~e, for one, a p~ zone--and at lS that, in the ~,~ar~,. ud area of felt 2 ~nd ~ 3--and the ~ell of the fomli~ cylind~ i8 y~, ro~ated ad~lihcm~11y, Fig. 4 i~ .n~e~ the 5~ iQ1~ sch~ ly and grea~y scaled up.
l~ecogni~le again is 1he fo~ g cylinder 1, it8 she~ fe~ a plurality of bo2es 1.4. Its ~ntOEior is pre~ ;7~A, ilh~ t~,d by~(~). The 20 fo~ cylindêr rotates ul ~e direc~on. of arrow 1.2. The slice nozzle 5 of a h~(lbo~ ~row~ a n.. 1,;"~.~ ide je,t into fhe ~;u~c~fo~ gap 4 fû~ned by felt 2 and wire 3. The paper web 8 that is beiIlg c~ea~ed i8 fhus ~andwiched ~el~n felt 2 a~d wi~e 3.
Felt 2 CQl~ a ce~, n~ y amou~t of water. The pro~
2S carries said water cont~ e~ ul felt 2 radially O~ll.n~d, which thus ~ccl~m~ tes on the radially outet ~face ~nd, th~ ru~, on the boui.d~.y ~urface lA~ ,e~ felt 2 and paper we~ 8 bemg created. Due to t~is acFumulation of ~e water co Ita;ncd ~n felt 2, a r~lativ~ly slight ~o~
of water is ~equir~cd in felt 2.
E~wsed di~cre.,lly, ~is means tbat felt 2 is rela~vely dry.
Th~ ~, also ~he exit d~.esvv ûf felt 2 is relatively low upo~ leaving a SENT BY:Xerox Telecopier 7020 ; 7-19-96 ; 14:25 ; BAKER&DANIELS~ ;~ 7 2 1 8~69 --~ot illu,~ 1 h~e--pre~s 8ecti0~. As a result, also an only slight rçmn~ ~ of paper web 8 i8 tal~ng place, 80 ~at also ~e paper web 8 po~sR~ a ~ iv~ly high dryness upon exiting f~om the press ~t;on.
Fu~ther a~lv~uL~. 1he risk of m~hi~g the paper web in the press sectio~
S is lowe~ tofol~; lilcew~se, less energy i~ needed i~ dryLng (b3r mea~s of dl~ring e~l~d.,l 12).
The em~;m~nt acco~ding to Fig. 4 allows a more low cost m~nvf~ re ~ the ~onary p~cl~ing carlie~ (9 in Fig. 1) is C~hl~
Provided in Pig. 2 i8 a pa~t~i~ ca~ier 9A which in the direction of rotation bounds two p~ass~ho zone~ (+) a~ted upon by di~"ent la~a~ueS~ w~ich pr~ure zones ~re follo~ed by a zone ~n which ~tmo~ er~c~ or~ UUl (-) mayprevail.
Fig. 5 shows a ~w~ ca~rier 9B (viewed in ~e di~ion of - lS arrow 5 of Fig. 3) c~able of fo~rung by me~ns of ~d(lili~ Ql sealing di~ks 13 several ~dja~nt ~ zo~es 13~, 13I3 a~d 13C, which c~n be acted UpOll with di~ t ~J~e.,~,B.
The inventio~ relates to a wire section for a paper In~Ghtne accor~g to the preamble claim 1.
Double ~ire sections a~e hlown in ma~y varia~ts. R~f~el~cc is S made to ~e m~gfl~in~ "Das P~ier," No. lOA, Vol. 1991~ pp. ~ 100 f~.
Accordwg to it, there are so-called roll f~ e,~ us~ exclu~i~,el~
rolls as d~ t~ g e1etn~nts~ FUL(1 c ~ re~ there ~re blade fol~e,~
slats arranged ~ e.ge to ~he m~rllin~ direction, as de~vate,~g elements.
0~ m~R~hi~s wi~ ho~ al sheet fo~g sect;on the ~ ce roll of ~e top w~e, i.e., the roll c~. jil~g the top ~ to ~e bottom wire, can ~1P,O be ~Tanged at a ce~ ho~ hn~e from ~he e~ roll of ~e bottom wire. This crea~es a pre-de..~l~g s~etch (~o-called hybnd former). R~ic~lty, ~uch offset b_t~.e~ the c.,lh~cc rolls of the two wire~ are possible also in a mRchin~ w~ veffical sheet ~ormi~g. In most ca~s, ~..~,.~,., l~e two e~c~ rolls, L~ the lattcr type of m~chin~.g~ are located ap~lo~.."Rtely ~ ~c same hu,~4ll~al pla~e.
These m~rhines are also called gap r~ e.~.
Also k~own (U.S. 3,378,435) is ~ a w~re and a felt, i~ of 20 two ~res, Bo~ belt~ wr~ aro~d the form~Ilg ~li-ld~r. The felt i8 disposed on t~e inside in the wl~p&~u~d, i.e., directly on the shell surface of ~e ~ 8 cylinder, ~h~ieas the wire ~vraps around the fo~ 8 cylinder on ~e outsi~e. C~ n~d between these two, in tur~, is ~e pa~er web, sandwiched b~ elt a~d wire. In ~his case? i.e., when 25 using a felt, the fnrmin~ cylinder has a continuous shell ~lrfAce.
To accon~rl;ch w~ a ~o c~lled former a good sheet f~ ;on, ~e ~elt must not nul on ~he forrning cylinder too dry. The felt even L~
sn(~u~1hd ~ith water in many ca~es. But such hi&h water content in the felt has a nc~,aL-_ e~ect o~ the fflo~sture content o the paper web.
30 Namely, the felt--along with the paper web lying on it ~r clirlgjr~g to it --contiml~s to run along after leaving the forming cylinder.- The t vo are SENT BY:Xerox Telecopier 702~ ; 7-19-96 ; 14:23 ; BAK~R~ANl~L~
a ~ ~ 8~i6~) passed ~rough a roll pres~, where ~ey arrive ur~ a relatively high wat~ colltent. It goes wi~out say~ng tha~ the exit water conte~t of felt a~d paper web will be t~e higher the higher the entra~ce water content at C-lt~ ;~ the press nip. Thus, the l,l~cc of water in the felt pnor to 5 w~ g around the fo,~ e cyl~nder, for one, is ~ for a fla~les~ wu,king of the fo~ g cylinder but, for another, it is u~ble whe~ l~e objective is achie~ a m~im~lly hig~ L~ei.j of ~e paper web pass~ng the pre~s nip.
The obje~ underlying the in~rentton i9 to design a wire section 10 acco~di~ to ~e p~eamble of claim 1 in a fashion such that the felt, as it wraps around the for~ g cylinder, for one, holds ~fft~iellt ~ater to be ~ble to ma~ter the formi~ job but, for ano~er, th~t it holds as lit-tle water a~ po~ihle i~ view of a minim~l water col~tent aflter e~u~g ~om the following press(es).
lS This objc~i~e is met by ffle ch&~ g ~.-t~ of claim 1.
In doing so, th~ ill /~or chose an avenue ~hat is completely cou~ . to the classic notion. ~tead of e2~posing the felt on it~ path in ~ap~g ~rou~d the fo,~~ d~ to a ~uum, in order to wi~hdraw ~v~ter from ~e felt ~nd pass it to the interior ûf the formirlg ~iyli~d~r for removal, provi~ions are that ~e felt be ~A~csed to p~e ~n the area of ~e wi~roul~d zone of ~e fo~ cyli~der (or at least part of tha~
~ ,~ouild ~rea). At the ~ame time, the finrn~i1tE ~ d~ i~ f~al~d, which aclii~ es that the ~lc~ forces the ~er co~ P~ in ~he felt to its radially oute~ s~ace in the ~a~ d~ and thu~ to the bound~y 2S su~ace ~vith t~e paper w~b. This assures a ~ffi~ ie~ er content ~ the ~rea of this bo~dasy s~ di~is~ y~ it me~ns t~at the felt overall - after leavi~g ~e fo~ cylinder ~ has a relatively low content of water. Hence, relati~rely lit~e water needs tû be r~ ,~e~ ftom ~e felt by the press(es). The dry~ess of lhe felt ex~ting the pre~s section i~ ~us rdatively hi~h, as cû~ed to prior art embo~ . Along with it, ho~ , also the dryness of the paper web be~cs rather high, ~ince SENT BY:Xerox Telecopier ~02C ; 7-19-96 ; 14:23 ; BAKER&DANI~LS~ ;~ 5 2 18~S69 ~e relatively dry felt can pick up, in ~e press ~ecti~n, much more water ~om ~he paper weS than a moist felt accoi~ing to ~e prior art Besides the said advantQges achieved by the inven~o~ it i~8 quite co~ ble that the iIIVentiQn~l al~p~ ti~n of ple~ t~8 in the S fiber fleece slight fiber mo~e.~ and that, hence, the fiber o~ !n peIpen~icul~r to the p~per surface is il~uenC~. The ~li~m~nt of an i~dividual fiber can hence be ...nu ,~A in ~ direc~on from the one pap~ side to the other. This ~llows i~n~e~ favorably, for ~d..~r~lc, the softnes.~ of a ~sgue paper.
The appliç~tion of press~e need not be c~ried out absolutely wi~ a~r. Congider~tiQn may ~c given ~lso to other mf,~ mq, ~or eY~n~ple ~team. Using differen~ ,s ~1l0~B ~ the ~iscosity of t~e wa~er co~t~ ~ ill the fiber fleece, ~us ;~ f l~Cit~ the de~at~.~g behavior.
Collcei~le is also ~e use of medium~ mixed wi~ nlic~ for in~pnee for felt When subdividing the p,~ ne l,~ e to the ~c-h;
~mning di~ ~ the option of applying di~ l plOS~,i. to the indi~idual zones created beeo~cs ava~labla This ~llow~ controlling o~
20 regnl~tin~ ~he u oi~tu~ crosæ pro~le of t~e pa~er web being creatcd.
The invention i~ more fiJlly erpls:necl with the aid of the drawing.
Fig. 1 æhows a double w~re fosmer con~r~Q;~ a fol~fi~g c~ de.
1, felt 2 ~lapping a~ound the fc~nnmg ~li~de. 1 ~lld be~ ~ r on its ~ell 9~ , as well as a wire 3 w~ round ~e fo ing 2S cylinder 1 as well, but be~ng di~ed o~ the outside in ~e wl&~rou~d.
Felt 2 ~nd wire 3 fonn a c~eifolm e~ e g~p 4. Said c ~ ce gap 4 receives a m~l~.hin~de jet of stock ~ ion issuin~ out of a headbox.
Ill~led of said headbox is merely its slice nozzle 5.
Felt 2 and wire 3 proceed then ~ough fi~he~ form~ng secti~n~
30 coL~.l)osed of flexibly mounted as well a~ rigdly a~l~ge~ slats. La~tly, ~e paper web 8 (das~ed), ~ow formed, is carr~ed off with the felt and SENT BY:Xerox Telecopier 7~2~ ; 7-19-96 ; 14:24 ; BAKE~&DANIELS~ ;~ 6 4 21~?S69 p~sed ~rough a press 11 (Fig. 2) or 1lA (Fig. 3) and ~T~n~ferred to a drying cylinder 12. The said slats ~re not illua~
Decisive is that the fonring cylinder 1 accor~i~g to the invendon feature a pre~ wne 1.1 co..~ev~l, ~.g., to a CO~lC~Cd ~ir source 10 5 and bvu~dcd favorably by a ~phon~ry pacL ;1~ carrier 9. Besides, lhe shell of f~.. ;.~g cylinder 1 is provided wi~h a plura~ty of bore~ 1.4 (Fig.
4). Thus, the said ~ re pr~ceeds onto the felt 2, ~e pape~ web 8 be~ created, and tihe ~e 3. Water ~ c;l ul the felt 2 is ~.crul~, forced ~ulw~d radially. Part of tlle w~ pr~eds ~rough ~e paper 10 web 8 and, toge~er ~ the water f~om the supplied jet of stock ~;on, through ~e w~re 3 iIltO a collection box 7 SullOUi~lg the aro~d zone (Fig. 3).
~ d~1it;QI-~I possible ~ t~ in Fig. ~ and 3. The fol~g cylinder r~dtul~o in each ca~e, for one, a p~ zone--and at lS that, in the ~,~ar~,. ud area of felt 2 ~nd ~ 3--and the ~ell of the fomli~ cylind~ i8 y~, ro~ated ad~lihcm~11y, Fig. 4 i~ .n~e~ the 5~ iQ1~ sch~ ly and grea~y scaled up.
l~ecogni~le again is 1he fo~ g cylinder 1, it8 she~ fe~ a plurality of bo2es 1.4. Its ~ntOEior is pre~ ;7~A, ilh~ t~,d by~(~). The 20 fo~ cylindêr rotates ul ~e direc~on. of arrow 1.2. The slice nozzle 5 of a h~(lbo~ ~row~ a n.. 1,;"~.~ ide je,t into fhe ~;u~c~fo~ gap 4 fû~ned by felt 2 and wire 3. The paper web 8 that is beiIlg c~ea~ed i8 fhus ~andwiched ~el~n felt 2 a~d wi~e 3.
Felt 2 CQl~ a ce~, n~ y amou~t of water. The pro~
2S carries said water cont~ e~ ul felt 2 radially O~ll.n~d, which thus ~ccl~m~ tes on the radially outet ~face ~nd, th~ ru~, on the boui.d~.y ~urface lA~ ,e~ felt 2 and paper we~ 8 bemg created. Due to t~is acFumulation of ~e water co Ita;ncd ~n felt 2, a r~lativ~ly slight ~o~
of water is ~equir~cd in felt 2.
E~wsed di~cre.,lly, ~is means tbat felt 2 is rela~vely dry.
Th~ ~, also ~he exit d~.esvv ûf felt 2 is relatively low upo~ leaving a SENT BY:Xerox Telecopier 7020 ; 7-19-96 ; 14:25 ; BAKER&DANIELS~ ;~ 7 2 1 8~69 --~ot illu,~ 1 h~e--pre~s 8ecti0~. As a result, also an only slight rçmn~ ~ of paper web 8 i8 tal~ng place, 80 ~at also ~e paper web 8 po~sR~ a ~ iv~ly high dryness upon exiting f~om the press ~t;on.
Fu~ther a~lv~uL~. 1he risk of m~hi~g the paper web in the press sectio~
S is lowe~ tofol~; lilcew~se, less energy i~ needed i~ dryLng (b3r mea~s of dl~ring e~l~d.,l 12).
The em~;m~nt acco~ding to Fig. 4 allows a more low cost m~nvf~ re ~ the ~onary p~cl~ing carlie~ (9 in Fig. 1) is C~hl~
Provided in Pig. 2 i8 a pa~t~i~ ca~ier 9A which in the direction of rotation bounds two p~ass~ho zone~ (+) a~ted upon by di~"ent la~a~ueS~ w~ich pr~ure zones ~re follo~ed by a zone ~n which ~tmo~ er~c~ or~ UUl (-) mayprevail.
Fig. 5 shows a ~w~ ca~rier 9B (viewed in ~e di~ion of - lS arrow 5 of Fig. 3) c~able of fo~rung by me~ns of ~d(lili~ Ql sealing di~ks 13 several ~dja~nt ~ zo~es 13~, 13I3 a~d 13C, which c~n be acted UpOll with di~ t ~J~e.,~,B.
Claims (5)
1. Wire section for a paper machine 1.1 comprising a forming cylinder (1);
1.2 a felt (2) and a wire (3), both wrapping around the forming cylinder (1) with the felt (2) disposed on the inside and the wire (3) disposed on the outside, the two forming a gap (4) for receiving a machinewide jet of stock suspension or a pre-dewatered paper web;
1.3 the forming cylinder (1) has a rotatably mounted perforated shell;
characterized by the following features:
1.4 at least part of the wraparound zone of forming cylinder (1) can be acted upon by pressure from the inside.
1.2 a felt (2) and a wire (3), both wrapping around the forming cylinder (1) with the felt (2) disposed on the inside and the wire (3) disposed on the outside, the two forming a gap (4) for receiving a machinewide jet of stock suspension or a pre-dewatered paper web;
1.3 the forming cylinder (1) has a rotatably mounted perforated shell;
characterized by the following features:
1.4 at least part of the wraparound zone of forming cylinder (1) can be acted upon by pressure from the inside.
2. Wire section according to claim 1, characterized in that a pressure zone (1.1) is partitioned off the interior of the forming cylinder (1) by means of a stationary packing carrier (9).
3. Wire section according to claim 2, characterized in that, viewed in the direction of rotation, several zones that can be acted upon by different pressures are provided successively.
4. Wire section according to claim 1 or 2, characterized in that, viewed transverse to the direction of web travel, several zones (13A, 13B, 13C) that can be acted upon with different pressures are provided side by side (Fig. 4).
5. Wire section according to claim 1, characterized in that the entire interior of the forming cylinder (1) is pressurized (Fig. 4).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4442756.5 | 1994-12-01 | ||
| DE19944442756 DE4442756A1 (en) | 1994-12-01 | 1994-12-01 | Screen section for a paper machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2182569A1 true CA2182569A1 (en) | 1996-06-06 |
Family
ID=6534618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2182569 Abandoned CA2182569A1 (en) | 1994-12-01 | 1995-12-01 | Wire section for a paper machine |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0742856A1 (en) |
| JP (1) | JPH09508947A (en) |
| BR (1) | BR9506961A (en) |
| CA (1) | CA2182569A1 (en) |
| DE (1) | DE4442756A1 (en) |
| FI (1) | FI963027A0 (en) |
| WO (1) | WO1996017126A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2944720B1 (en) * | 2014-05-15 | 2018-07-25 | ICONè S.R.L. | Former section and method for producing paper |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1241252B (en) * | 1961-05-29 | 1967-05-24 | Rice Barton Corp | Paper machine |
| US3311533A (en) * | 1963-04-29 | 1967-03-28 | Pulp Paper Res Inst | Apparatus for making formed fibrous webs |
| FI313874A (en) * | 1974-10-25 | 1976-04-26 | Valmet Oy | |
| FI379274A (en) * | 1974-12-30 | 1976-07-01 | Valmet Oy | |
| DE2721158C3 (en) * | 1977-05-11 | 1980-02-07 | Er-We-Pa Maschinenfabrik Und Eisengiesserei Herbert Karl Schmidt, 4006 Erkrath | Paper machine, in particular for the production of tissue paper |
| DE3123131C2 (en) * | 1981-06-11 | 1986-01-09 | J.M. Voith Gmbh, 7920 Heidenheim | Dewatering roller with water drainage element for a paper machine screen belt |
-
1994
- 1994-12-01 DE DE19944442756 patent/DE4442756A1/en not_active Withdrawn
-
1995
- 1995-12-01 WO PCT/EP1995/004737 patent/WO1996017126A1/en not_active Application Discontinuation
- 1995-12-01 CA CA 2182569 patent/CA2182569A1/en not_active Abandoned
- 1995-12-01 JP JP8518204A patent/JPH09508947A/en active Pending
- 1995-12-01 EP EP95941643A patent/EP0742856A1/en not_active Withdrawn
- 1995-12-01 BR BR9506961A patent/BR9506961A/en not_active Application Discontinuation
-
1996
- 1996-07-31 FI FI963027A patent/FI963027A0/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FI963027A (en) | 1996-07-31 |
| EP0742856A1 (en) | 1996-11-20 |
| BR9506961A (en) | 1997-09-16 |
| JPH09508947A (en) | 1997-09-09 |
| WO1996017126A1 (en) | 1996-06-06 |
| FI963027A0 (en) | 1996-07-31 |
| DE4442756A1 (en) | 1996-07-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 19981201 |