Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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
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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
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~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
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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
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--~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.
