CA1331531C - Forming apparatus - Google Patents
Forming apparatusInfo
- Publication number
- CA1331531C CA1331531C CA000615189A CA615189A CA1331531C CA 1331531 C CA1331531 C CA 1331531C CA 000615189 A CA000615189 A CA 000615189A CA 615189 A CA615189 A CA 615189A CA 1331531 C CA1331531 C CA 1331531C
- Authority
- CA
- Canada
- Prior art keywords
- shoes
- wire
- stock
- forming apparatus
- forming
- 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.)
- Expired - Fee Related
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
-
- 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
Landscapes
- Paper (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE:
A forming apparatus is disclosed for forming a web from stock. The apparatus includes in a headbox for ejecting a jet of the stock. A first and a second moving wire cooperate together to define therebetween a forming section having a first and a second end. The first end of the forming section is disposed closely adjacent to the headbox. A first plurality of shoes cooperate with the first wire such that water drains from the stock through the first wire and through a first plurality of channels defined by the first plurality of shoes. A second plurality of shoes cooperate with the second wire such that water drains from the stock through the second wire and through a plurality of slots defined by the second plurality of shoes. The first and the second plurality of shoes are staggered relative to each other for enhancing the dispersion of fibers within the stock during formation of the web.
A forming apparatus is disclosed for forming a web from stock. The apparatus includes in a headbox for ejecting a jet of the stock. A first and a second moving wire cooperate together to define therebetween a forming section having a first and a second end. The first end of the forming section is disposed closely adjacent to the headbox. A first plurality of shoes cooperate with the first wire such that water drains from the stock through the first wire and through a first plurality of channels defined by the first plurality of shoes. A second plurality of shoes cooperate with the second wire such that water drains from the stock through the second wire and through a plurality of slots defined by the second plurality of shoes. The first and the second plurality of shoes are staggered relative to each other for enhancing the dispersion of fibers within the stock during formation of the web.
Description
s57692986 1~3~ ~31 . .
relatiGnshi~ relative to the slots and the shoes are arranged so that the wires ~xtend in a curved configuration from the u~stream to the 20wnstream end of the forming sec~ior.. The distance between the u~er and the lower shoes can be adjusted to control the ~ressure ~lses eAerted on the stock.
Additional~y, at least two com~artments in a machine direction are dis~osé~ beneath the lo~er wire and valves,control the flow of white water from the stoc~ ~assir.~ between the wires so there exists a very controlied àewaterins.
Therefore, it is d ~rimary cbject of the ~LeSent inventicn to ~rovide a forr,ing a~aratus ~;hich o~erccmes the inadec,uacies cf the ~rior art ~ro~osals and which m~kes a considerable contribution to tr.e art of forming a ~ieb fro~
s~ock.
~ nother oh,ect Gf the Fresent inventior. is to enhance fiber dis~ersion while inhibiting flocculatior! ir, hi~3h consistency forming. ~
~ ..
Other objects anZ ddvantases ~rovided bv the Fresent invention will be readily ar~rent to thcce skilled in t.he art bv a consideration o, the oetailed ae_cri~tion Or a ~referred embodi~,ent of the invention contained hereinafter.
SU~ RY OF THE INVENTION
.
The ~resent invention relates to a forminq a~Faratus and method for forming a ~el, rror, stoc~. The a~Farcl~us incluùes B576~2986 - i33J ~31 a headbox for ejecting a jet of the stock. A first and a ,' second moving wire cooperate together to define therebetween a forming section having a first and a second end. The first end is dis~osec, closely adjacent to the headbox. A first Fluralit~ of shoes cooperate with the first wire such that water drains from the stock throuc,h the first ~ire and throuc~h a Flurality of drainage channels defined by the first ~luralit~ of shoes.
~ secono plurality of shoes cooFerate with the seconc`
wire such that water drains from the stock through the secona wire and through a Flurality of slots aefined by ~he second '~
., t,l.r.i~
~lurality of shoes. The first and the second Flurality of shoes are disFGsed in staggered relationshiF, relative ~,o each other for enhancincl ~he disFersion of fibers within the stock -~' during the formation of the web. ~, In a mor~ sFecific embodiment of the Fresent jn~en~ion, ~he headbox is a high ccnsistency hea.doox. rurthermore, the forming aFFaratus inclu~es a first ~urnillc, bar ~hich is disFosed between the headbo~ and the first eno of the for~ing section such th2t the ~irst ~ire ext,ends around the ~irst turning bar. Adoitionally, a secono turning bar is disFosed between the headbox and the first enc'i of the forming sec~ion such that the secGnd wire extends around the second turning bar. The arrangement is such t~Jat a jet of stock flows from ~''' ~he headbox to the forming section bet-ieen the first and the secona t~rning bars.
133~3.~ 31 The forrr,ing section is curved in a airection from the first tow~rds the second end tt,ereof. The curved forming section is inclined uF~wardly from the first end towards ~he seconc end thereof witt, the fGrming section sobsequently descending to tte second end thereof suct. that the stock fcliows a curved path fror^ the first to the seconcl end of the forming section.
~tore specifically, the cur~Gd patt, is an arc which has a -~
radius within the range 150 to 250 inches.
. ~ ~ :.-Eact, shoe of the first and second plurality of slhoes issolid with each shc)e of the first Flurality of shoes defining a ct.annei.
Similarly, each shoe of the second plurality Gf shoes cefines a slot.
The nur,ber of shoes c,f tthG first plurality cf stces is ecual tc tt,e numGer of st,oes of the second Fluralitv of shoes such tt.at each stoe of the first ana the second plurality of shoes is disposed in staggered relatiGr.st;iF~ with eact shoe definir.g a steF.
`
Each shoe 03 the first pluraiity of shoes cefines ar inciined surface with the inclined surface being c'isposed in a plane which corlverses in a machine directicn with the first ~ire, t:he surface extenc3ing from the ctannel to tthe fiLst wire.
1~3~ ~31 Each shoe of the second ~lurality cf shoes defines an inclined face with the ir.clined face being disposed in a ~clane which converaeC in a r,achine directiorl ~ith the second wire. Each face extencls from the slot to the second wire.
~ he forming a~Faratus includes means for adjusting the distance between the first and the seconci plurality of shoes ; ;
for cGntrollina the res~ective pressure ~ulses a~plied to the i `~
stock during ~assage of the stock through the formin~ section.
:!~ , '' , The forming a~aratus also includes a ~ressure vessel cc,nnected to the char,nels and control means for controlling t~.e flow of water ~hrough the channels.
r~Ore s~ecifically, the ~ressure veScel includes a first ana a second com~art~,er.t disposed in a ~achine clirectiGn.
The control means incluc`eci a first and a seconci ccr.t.rol valve for controlling t~e flow of water fror, ~.he first ana the second compartments so that downwarà craina~e in a ~achir.e clir~ction can be con'.rc)llec' ~y the control valves.
Lhe present ir,vention aiSO includes a r,e~hod of forr,inc, ;-~
a web from ~ hic3h cGnsistency stock. ~hc r;ethod includes ~h~
steps:
of ejectir.g a jet of the stoc~ frorn a headt>c~x; - ~;
, ;, .......
rnoving a fi.rst anci a secc,nd uire such that the wires coo~erate together tc defille therebet--eer a ~;
forming section having a first and a secona er~d, , ss7692986 -` 13~ ~31 ~ ~
the first end of the forming section being disFosed closely adjacent to the headbox;
mo~-ing the first wire over a first plurality of shoes suc~, that water drains from the stoc~ through the first wire and through a first plurality of c,hannels defineà by the first plurality of shoes;
r,oving the second wire such that the second ~ire extends E~ast a second E~luralit,v of shoes so that water drains from the stock thLough the second ~ire and thra~ch a plurality of sloLs definea by L~,e secona pluralit~ of shoes; ana staggerir,g the first E~lurality of ~shoes relative Lo the secc)nd E~iucality of shoes for enh2ncing Lhe disE~ersiGr. of fibers within the stock durillg the formation of the web. ~ -' :
~ .an~ modi~ications and variations of the E~resenL
invention will be aLpaLent to those skilled in the art b~
corsideration of the detailea aescription containea hereinafter taken in conjunction with the annexed dra~/ing.
Such modifications and variatiGns fall ~;lithin the spiriL and scoE~e of the presenL invention as defired by the apE~endea clajms. ~ ' ~ .
~ ~ 3 ~ ~ 31 B57692986 " :
_RIEF DESCRIPTION OF THE DP~AWI~GS
~isure 1 is a side-~levational vie~1 of a forming .. .
apparatus according to the present invention; and Figure 2 is an enlarged elevational view of at least one shoe ar.à channel as shown in fisure 1. ~ -DETAILED DES~RT~TION ~. ~nE DP~AWIMGS
~ isure 1 is a side-elevational view of a forming apparztus generally designated 10 for forming a web ~. from stock S. ~he aFFaratus 10 comprises a h~ac;ho~ 12 for ejecting â jet ~ of the stock S.
A first and a secono r,oving wire 14 ar.à 16 respectively -~
cooperate together tc define therebet-.Jeen a forming section 18 having a first and a second end 20 and res~ectively.
~he first end 20 of the fo~ing section 18 is disposed clasel~ ad,acent to the heaabo~
A first pluralitv of shoes 2~, 25, ~6, 7, ?.8, 29, 30, 31, 32 ana 33 cooperate with the first wire 14 such that water alc~ins from the stock S through the firs~ wire 1~ and through a ~lurality of àrainage channels 34, 35, 36, 37, 38, 3S, ~0, 41 and 42 defineà b~- the plurality of shoes 24 to 33.
A second pluralit.~ of shoes 44, 45, 46, 47, a8, 49, 50, ~:~
Sl, S~ and 53 ccopercAte with the second wire ]6 such that water clrains from the stock S through the seconc' wire 16 ar.c' :"~
L, 1 3 3 ~ 5 3 ~
~"
through a ~lurality of slots 54, 55, 56, 57, 5&, 59, 60, 61 and 62 defined by the seconcl plurality of shGes 44 to 53.
The first andi the second plurality of shoes 24 to 33 and 44 to 53 are staggered relative to each other for enhancing the dis~ersion of fibers within the stock S during the formation of the web ~. ~
~ ore ~articularly, as shown in figure 1, the headbox 12 is a high consistencv headbox.
The forming a~aratus 10 also includec a first turning bcr 64 dis~osed between the headbo~: 12 anà the first end 20 of the forming sectior. i& such that the first ~lire 14 extenc`s around the first turnir.a bar 64.
~; second turnina bar GG is dis~osed between the heaàbox ~-12 ar.à the first end ?.G of the forming section 18 such tha ~.he secor.c' wire 16 extends around the seconcd turning bar ~6.
The jet J of stoc~ ~ r,oves from the he2dbox 12 to the for."ing section 1~ between the first and the second turning bars 6;~
and 66 res~ectivel~
In a ~referred embodiment of the ~resent inventior., the turning bars are dis~osec at a distance rlclt greater than inches from the forring section 18. -~
:: ~:
~he forminy sect.ion 18 is curved in a direction from he first. end 20 to~ards 'he second end '?. thereof.
::
r~ '~: . - ::.:: ~: ~ : :. ' : . :
"~
The curved forming section 18 is inclir.eci u~wardly from the first end 20 towards the second end thereof. The forming section subsequently descerlds to the second end 22 such that the stock S follows a curveci Fc~th or forming section 13 from the first to the second end 70 and 22 res~iectively of the forrr,ing section 18. More sFecifically, the path 18 is an arc which has a radius R within the range 150 to 40~ inches. In a s~ecific embodiment of the ~resen~ invention, the radius R
is 2G0 inches. The cur-Jed ~ar~h inhibits lateral wandering of the wires relative to the shoes.
~ach shoe of the first anc7 s-econd F~lurality of shoes~
24-32, 44-53 res~ectively is solid. ~ :
.s shown in cigure 2 ~:hich is an enlarged frasmentary ~iew of the shoe '8, the shce .8 of the first Flurality of shoes ?4 to 32 defines a channel 37 of the first ~lurality of channels 34 to 4?.
Lhe shoe 48 of the second ~lurality of s-hoes 4d to 53 defines a slc~t. 57 of the rlurality of slots 5~ to 62.
The nurrher of shoes o~ the first F~ rality of shoes 24 tG 7' is ecrual to the nuruber cf shoes of the second ~lurality ;~
of shoes 44 to 53 such that ~he shoe 28 of the first ~lurality of shces 24 to 33 is dis~osed ir, staggered relationshi~ with the shoe q8 of ~.he secor:c ~lurality of shoes 44 tG 53. Ihe shoe 28 defines Cl ste~ 68 cnd ~he shoe 48 defines a ste~ 70.
, s57692986 ~3~
The shoe 28 of the first pluralit~ of shoes defines an, inclined surface 72 with t~.e inclined surface 72 being '~' dis~osed in a firs~- ~lane Pl which converges in a rr\achine direction indicatecl by the arro~J MD with the first ~ire 14.
~he surface 72 extends from the c~,annel 37 to the first wire 14.
, The shoe ~& o~ the second plurality cf shoes defines an inc,lined face 7~. The inclined face 74 is disposed in a second ~lane P2 which converges in the machine direction MD
wi~h the secona wire 16. mhe face 74 extends frem the slot 5/ to the seconcl wire 16.
T~:e forming apparatus lO also includes means senerâlly '~
desisnated 76 for adj~stina the distance between the fi.rst and t~e second plurality of shces for controllinc the respective pre~sure pulses applie(l to the stock S durinS ;~
~assage thro~s~, the forming sectioll 18. ~iore par~icularly, the rr,eans 7G s~,own in figure i ir.c]~des rails 78 ana &G ar.d drive means (not s~.own) for moving an u~er container 82 t o~ards or awav from a lower cont.ainec' 84 as indicatec`. b~ ~.he arrow 86.
A first dewat ering means gene~ lly c,esignated 88 inc]uclec a pressure vessei generally designatecl gn which is cennected tc- the charlnels 34 to 42.
Pressure vessel 90 is divicled in.tG at least two compartnlents 92, 94. Additionall~,~, control rrleans genercllly --iO--.
I 13 3 ~ ~ 31 s57692986 , designated 96 control the flow of water through the channels 34 to 42.
More specifically, the first anà a second co~,Fartment 92 anà 94 of pressure vessel 90 are àis~osed in the machine direction MD and the control means C6 includes a first and second control valve 98 and 100 res~ectively fo~ controlling the flow of water from the first and t~.e second compartr,ents 9~ and 94 so that downward drainage in c~ ~,achine direction ~;D
can be controlled by use of the contrcl valves 98 and 100.
, ,,,~
Similarly, the upper ccintainer 82 is dividea into at least two enclosures 10~, 104 by a wall ln6. The enclosures ~ `
10~ and 104 are connected bv conduits 108, 110 tc a source of ~-~
Far~ial vacuum 112. Control valves 114, 116 are dis~osed -~
within conduits 10&, iiC for controlling the u~ward dewatering Gf the stock S ~hrough slots 54 to 62.
'n o~eration of the a~para'-us sho~/n in figures 1 ancl 2, a high consistency stock S is ejec'_ed from the headbox 12 between conveLsing wires 14 and 16. The wires 1~ ana 16 converge resp~ctively around t~rning bars 64 and 66 so that a rormins section 18 is for~,ed between ~he wires 14 and 16.
~he stock durins ~assage through the ~orming section 1~ is subjected to ?~ltern?~te upward ancd downward drainage through the plura~it~ o~ slots and channels res~ectivel~. The deglee of drainage is c:ontrolled respective~y by control valves S~, 100, 114 and 116 so that a gentle dewateriIlg of the stc,ck is carried out while subjecting t.~e .stock to staggerec.
~ "
. j , .
.~ .
t ~
s57692986 133~ ~31 `
~ressure ~ulses durins ~assage through the forming section.
The distance between the u~per and lower wires can be adjusted by movement of the u~er container 8~ on rails 78, ~0 while maintaining the lower con~.ai.ner 84 in a fixed dis~osition.
The ~resent invention provides an i.mproved means for dispersing the fibers within a high consistenc~ stock during ~he forr.~ation of ~he web, such dis~ersion being attainable withou~ undue flocculation. .
' :
. ~; '''- :: ~ : -" ' 1 . ' :
. ~:,, . . ,,. ".",
relatiGnshi~ relative to the slots and the shoes are arranged so that the wires ~xtend in a curved configuration from the u~stream to the 20wnstream end of the forming sec~ior.. The distance between the u~er and the lower shoes can be adjusted to control the ~ressure ~lses eAerted on the stock.
Additional~y, at least two com~artments in a machine direction are dis~osé~ beneath the lo~er wire and valves,control the flow of white water from the stoc~ ~assir.~ between the wires so there exists a very controlied àewaterins.
Therefore, it is d ~rimary cbject of the ~LeSent inventicn to ~rovide a forr,ing a~aratus ~;hich o~erccmes the inadec,uacies cf the ~rior art ~ro~osals and which m~kes a considerable contribution to tr.e art of forming a ~ieb fro~
s~ock.
~ nother oh,ect Gf the Fresent inventior. is to enhance fiber dis~ersion while inhibiting flocculatior! ir, hi~3h consistency forming. ~
~ ..
Other objects anZ ddvantases ~rovided bv the Fresent invention will be readily ar~rent to thcce skilled in t.he art bv a consideration o, the oetailed ae_cri~tion Or a ~referred embodi~,ent of the invention contained hereinafter.
SU~ RY OF THE INVENTION
.
The ~resent invention relates to a forminq a~Faratus and method for forming a ~el, rror, stoc~. The a~Farcl~us incluùes B576~2986 - i33J ~31 a headbox for ejecting a jet of the stock. A first and a ,' second moving wire cooperate together to define therebetween a forming section having a first and a second end. The first end is dis~osec, closely adjacent to the headbox. A first Fluralit~ of shoes cooperate with the first wire such that water drains from the stock throuc,h the first ~ire and throuc~h a Flurality of drainage channels defined by the first ~luralit~ of shoes.
~ secono plurality of shoes cooFerate with the seconc`
wire such that water drains from the stock through the secona wire and through a Flurality of slots aefined by ~he second '~
., t,l.r.i~
~lurality of shoes. The first and the second Flurality of shoes are disFGsed in staggered relationshiF, relative ~,o each other for enhancincl ~he disFersion of fibers within the stock -~' during the formation of the web. ~, In a mor~ sFecific embodiment of the Fresent jn~en~ion, ~he headbox is a high ccnsistency hea.doox. rurthermore, the forming aFFaratus inclu~es a first ~urnillc, bar ~hich is disFosed between the headbo~ and the first eno of the for~ing section such th2t the ~irst ~ire ext,ends around the ~irst turning bar. Adoitionally, a secono turning bar is disFosed between the headbox and the first enc'i of the forming sec~ion such that the secGnd wire extends around the second turning bar. The arrangement is such t~Jat a jet of stock flows from ~''' ~he headbox to the forming section bet-ieen the first and the secona t~rning bars.
133~3.~ 31 The forrr,ing section is curved in a airection from the first tow~rds the second end tt,ereof. The curved forming section is inclined uF~wardly from the first end towards ~he seconc end thereof witt, the fGrming section sobsequently descending to tte second end thereof suct. that the stock fcliows a curved path fror^ the first to the seconcl end of the forming section.
~tore specifically, the cur~Gd patt, is an arc which has a -~
radius within the range 150 to 250 inches.
. ~ ~ :.-Eact, shoe of the first and second plurality of slhoes issolid with each shc)e of the first Flurality of shoes defining a ct.annei.
Similarly, each shoe of the second plurality Gf shoes cefines a slot.
The nur,ber of shoes c,f tthG first plurality cf stces is ecual tc tt,e numGer of st,oes of the second Fluralitv of shoes such tt.at each stoe of the first ana the second plurality of shoes is disposed in staggered relatiGr.st;iF~ with eact shoe definir.g a steF.
`
Each shoe 03 the first pluraiity of shoes cefines ar inciined surface with the inclined surface being c'isposed in a plane which corlverses in a machine directicn with the first ~ire, t:he surface extenc3ing from the ctannel to tthe fiLst wire.
1~3~ ~31 Each shoe of the second ~lurality cf shoes defines an inclined face with the ir.clined face being disposed in a ~clane which converaeC in a r,achine directiorl ~ith the second wire. Each face extencls from the slot to the second wire.
~ he forming a~Faratus includes means for adjusting the distance between the first and the seconci plurality of shoes ; ;
for cGntrollina the res~ective pressure ~ulses a~plied to the i `~
stock during ~assage of the stock through the formin~ section.
:!~ , '' , The forming a~aratus also includes a ~ressure vessel cc,nnected to the char,nels and control means for controlling t~.e flow of water ~hrough the channels.
r~Ore s~ecifically, the ~ressure veScel includes a first ana a second com~art~,er.t disposed in a ~achine clirectiGn.
The control means incluc`eci a first and a seconci ccr.t.rol valve for controlling t~e flow of water fror, ~.he first ana the second compartments so that downwarà craina~e in a ~achir.e clir~ction can be con'.rc)llec' ~y the control valves.
Lhe present ir,vention aiSO includes a r,e~hod of forr,inc, ;-~
a web from ~ hic3h cGnsistency stock. ~hc r;ethod includes ~h~
steps:
of ejectir.g a jet of the stoc~ frorn a headt>c~x; - ~;
, ;, .......
rnoving a fi.rst anci a secc,nd uire such that the wires coo~erate together tc defille therebet--eer a ~;
forming section having a first and a secona er~d, , ss7692986 -` 13~ ~31 ~ ~
the first end of the forming section being disFosed closely adjacent to the headbox;
mo~-ing the first wire over a first plurality of shoes suc~, that water drains from the stoc~ through the first wire and through a first plurality of c,hannels defineà by the first plurality of shoes;
r,oving the second wire such that the second ~ire extends E~ast a second E~luralit,v of shoes so that water drains from the stock thLough the second ~ire and thra~ch a plurality of sloLs definea by L~,e secona pluralit~ of shoes; ana staggerir,g the first E~lurality of ~shoes relative Lo the secc)nd E~iucality of shoes for enh2ncing Lhe disE~ersiGr. of fibers within the stock durillg the formation of the web. ~ -' :
~ .an~ modi~ications and variations of the E~resenL
invention will be aLpaLent to those skilled in the art b~
corsideration of the detailea aescription containea hereinafter taken in conjunction with the annexed dra~/ing.
Such modifications and variatiGns fall ~;lithin the spiriL and scoE~e of the presenL invention as defired by the apE~endea clajms. ~ ' ~ .
~ ~ 3 ~ ~ 31 B57692986 " :
_RIEF DESCRIPTION OF THE DP~AWI~GS
~isure 1 is a side-~levational vie~1 of a forming .. .
apparatus according to the present invention; and Figure 2 is an enlarged elevational view of at least one shoe ar.à channel as shown in fisure 1. ~ -DETAILED DES~RT~TION ~. ~nE DP~AWIMGS
~ isure 1 is a side-elevational view of a forming apparztus generally designated 10 for forming a web ~. from stock S. ~he aFFaratus 10 comprises a h~ac;ho~ 12 for ejecting â jet ~ of the stock S.
A first and a secono r,oving wire 14 ar.à 16 respectively -~
cooperate together tc define therebet-.Jeen a forming section 18 having a first and a second end 20 and res~ectively.
~he first end 20 of the fo~ing section 18 is disposed clasel~ ad,acent to the heaabo~
A first pluralitv of shoes 2~, 25, ~6, 7, ?.8, 29, 30, 31, 32 ana 33 cooperate with the first wire 14 such that water alc~ins from the stock S through the firs~ wire 1~ and through a ~lurality of àrainage channels 34, 35, 36, 37, 38, 3S, ~0, 41 and 42 defineà b~- the plurality of shoes 24 to 33.
A second pluralit.~ of shoes 44, 45, 46, 47, a8, 49, 50, ~:~
Sl, S~ and 53 ccopercAte with the second wire ]6 such that water clrains from the stock S through the seconc' wire 16 ar.c' :"~
L, 1 3 3 ~ 5 3 ~
~"
through a ~lurality of slots 54, 55, 56, 57, 5&, 59, 60, 61 and 62 defined by the seconcl plurality of shGes 44 to 53.
The first andi the second plurality of shoes 24 to 33 and 44 to 53 are staggered relative to each other for enhancing the dis~ersion of fibers within the stock S during the formation of the web ~. ~
~ ore ~articularly, as shown in figure 1, the headbox 12 is a high consistencv headbox.
The forming a~aratus 10 also includec a first turning bcr 64 dis~osed between the headbo~: 12 anà the first end 20 of the forming sectior. i& such that the first ~lire 14 extenc`s around the first turnir.a bar 64.
~; second turnina bar GG is dis~osed between the heaàbox ~-12 ar.à the first end ?.G of the forming section 18 such tha ~.he secor.c' wire 16 extends around the seconcd turning bar ~6.
The jet J of stoc~ ~ r,oves from the he2dbox 12 to the for."ing section 1~ between the first and the second turning bars 6;~
and 66 res~ectivel~
In a ~referred embodiment of the ~resent inventior., the turning bars are dis~osec at a distance rlclt greater than inches from the forring section 18. -~
:: ~:
~he forminy sect.ion 18 is curved in a direction from he first. end 20 to~ards 'he second end '?. thereof.
::
r~ '~: . - ::.:: ~: ~ : :. ' : . :
"~
The curved forming section 18 is inclir.eci u~wardly from the first end 20 towards the second end thereof. The forming section subsequently descerlds to the second end 22 such that the stock S follows a curveci Fc~th or forming section 13 from the first to the second end 70 and 22 res~iectively of the forrr,ing section 18. More sFecifically, the path 18 is an arc which has a radius R within the range 150 to 40~ inches. In a s~ecific embodiment of the ~resen~ invention, the radius R
is 2G0 inches. The cur-Jed ~ar~h inhibits lateral wandering of the wires relative to the shoes.
~ach shoe of the first anc7 s-econd F~lurality of shoes~
24-32, 44-53 res~ectively is solid. ~ :
.s shown in cigure 2 ~:hich is an enlarged frasmentary ~iew of the shoe '8, the shce .8 of the first Flurality of shoes ?4 to 32 defines a channel 37 of the first ~lurality of channels 34 to 4?.
Lhe shoe 48 of the second ~lurality of s-hoes 4d to 53 defines a slc~t. 57 of the rlurality of slots 5~ to 62.
The nurrher of shoes o~ the first F~ rality of shoes 24 tG 7' is ecrual to the nuruber cf shoes of the second ~lurality ;~
of shoes 44 to 53 such that ~he shoe 28 of the first ~lurality of shces 24 to 33 is dis~osed ir, staggered relationshi~ with the shoe q8 of ~.he secor:c ~lurality of shoes 44 tG 53. Ihe shoe 28 defines Cl ste~ 68 cnd ~he shoe 48 defines a ste~ 70.
, s57692986 ~3~
The shoe 28 of the first pluralit~ of shoes defines an, inclined surface 72 with t~.e inclined surface 72 being '~' dis~osed in a firs~- ~lane Pl which converges in a rr\achine direction indicatecl by the arro~J MD with the first ~ire 14.
~he surface 72 extends from the c~,annel 37 to the first wire 14.
, The shoe ~& o~ the second plurality cf shoes defines an inc,lined face 7~. The inclined face 74 is disposed in a second ~lane P2 which converges in the machine direction MD
wi~h the secona wire 16. mhe face 74 extends frem the slot 5/ to the seconcl wire 16.
T~:e forming apparatus lO also includes means senerâlly '~
desisnated 76 for adj~stina the distance between the fi.rst and t~e second plurality of shces for controllinc the respective pre~sure pulses applie(l to the stock S durinS ;~
~assage thro~s~, the forming sectioll 18. ~iore par~icularly, the rr,eans 7G s~,own in figure i ir.c]~des rails 78 ana &G ar.d drive means (not s~.own) for moving an u~er container 82 t o~ards or awav from a lower cont.ainec' 84 as indicatec`. b~ ~.he arrow 86.
A first dewat ering means gene~ lly c,esignated 88 inc]uclec a pressure vessei generally designatecl gn which is cennected tc- the charlnels 34 to 42.
Pressure vessel 90 is divicled in.tG at least two compartnlents 92, 94. Additionall~,~, control rrleans genercllly --iO--.
I 13 3 ~ ~ 31 s57692986 , designated 96 control the flow of water through the channels 34 to 42.
More specifically, the first anà a second co~,Fartment 92 anà 94 of pressure vessel 90 are àis~osed in the machine direction MD and the control means C6 includes a first and second control valve 98 and 100 res~ectively fo~ controlling the flow of water from the first and t~.e second compartr,ents 9~ and 94 so that downward drainage in c~ ~,achine direction ~;D
can be controlled by use of the contrcl valves 98 and 100.
, ,,,~
Similarly, the upper ccintainer 82 is dividea into at least two enclosures 10~, 104 by a wall ln6. The enclosures ~ `
10~ and 104 are connected bv conduits 108, 110 tc a source of ~-~
Far~ial vacuum 112. Control valves 114, 116 are dis~osed -~
within conduits 10&, iiC for controlling the u~ward dewatering Gf the stock S ~hrough slots 54 to 62.
'n o~eration of the a~para'-us sho~/n in figures 1 ancl 2, a high consistency stock S is ejec'_ed from the headbox 12 between conveLsing wires 14 and 16. The wires 1~ ana 16 converge resp~ctively around t~rning bars 64 and 66 so that a rormins section 18 is for~,ed between ~he wires 14 and 16.
~he stock durins ~assage through the ~orming section 1~ is subjected to ?~ltern?~te upward ancd downward drainage through the plura~it~ o~ slots and channels res~ectivel~. The deglee of drainage is c:ontrolled respective~y by control valves S~, 100, 114 and 116 so that a gentle dewateriIlg of the stc,ck is carried out while subjecting t.~e .stock to staggerec.
~ "
. j , .
.~ .
t ~
s57692986 133~ ~31 `
~ressure ~ulses durins ~assage through the forming section.
The distance between the u~per and lower wires can be adjusted by movement of the u~er container 8~ on rails 78, ~0 while maintaining the lower con~.ai.ner 84 in a fixed dis~osition.
The ~resent invention provides an i.mproved means for dispersing the fibers within a high consistenc~ stock during ~he forr.~ation of ~he web, such dis~ersion being attainable withou~ undue flocculation. .
' :
. ~; '''- :: ~ : -" ' 1 . ' :
. ~:,, . . ,,. ".",
Claims (16)
1. A forming apparatus for forming a web from stock, said apparatus, comprising:
a headbox for ejecting a jet of stock;
a first and second moving wire cooperating together to define therebetween a forming section having a first and a second end, said wires running contiguously relative to each other from said first to said second end, said first end being disposed closely adjacent to said headbox;
a first plurality of shoes cooperating with said first wire such that water drains downwardly from the stock through said first wire and through a first plurality of channels defined by said first plurality of shoes;
a second plurality of shoes cooperating with said second wire such that water drains upwardly from the stock through said second wire and through a plurality of slots defined by said second plurality of shoes;
said first and second plurality of shoes being staggered relative to each other for enhancing the dispersion of fibres within the stock during the formation of the web;
a first turning bar disposed between said headbox and said first end of said forming section such that said first wire extends around said first turning bar; and a second turning bar disposed between said headbox and said first end of said forming section such that said forming wire extends around said turning bar, said jet of stock moving from said headbox to said forming section between said first and second turning bars.
a headbox for ejecting a jet of stock;
a first and second moving wire cooperating together to define therebetween a forming section having a first and a second end, said wires running contiguously relative to each other from said first to said second end, said first end being disposed closely adjacent to said headbox;
a first plurality of shoes cooperating with said first wire such that water drains downwardly from the stock through said first wire and through a first plurality of channels defined by said first plurality of shoes;
a second plurality of shoes cooperating with said second wire such that water drains upwardly from the stock through said second wire and through a plurality of slots defined by said second plurality of shoes;
said first and second plurality of shoes being staggered relative to each other for enhancing the dispersion of fibres within the stock during the formation of the web;
a first turning bar disposed between said headbox and said first end of said forming section such that said first wire extends around said first turning bar; and a second turning bar disposed between said headbox and said first end of said forming section such that said forming wire extends around said turning bar, said jet of stock moving from said headbox to said forming section between said first and second turning bars.
2. A forming apparatus as set forth in claim 1, wherein said forming section is curved in a direction from said first towards said second end thereof.
3. A forming apparatus as set forth in claim 2, wherein said curved forming section is inclined upwardly from said first end towards said second end thereof, said forming section subsequently descending to said second end thereof such that the stock follows a curved path from said first to said second end of said forming section.
4. A forming apparatus as set forth in claim 3, wherein said path is an arc.
5. A forming apparatus as set forth in claim 4, wherein said arc has a radius within the range 150 to 400 inches.
6. A forming apparatus as set forth in claim 1, wherein each shoe of said first plurality of shoes defines a channel of said plurality of channels.
7. A forming apparatus as set forth in claim 1, wherein each shoe of said second plurality of shoes defines a slot of said plurality of slots.
8. A forming apparatus as set forth in claim 1, wherein said first plurality of shoes is equal to said second plurality of shoes such that each shoe of said first and second plurality of shoes is disposed in staggered relationship, each shoe defining a step.
9. A forming apparatus as set forth in claim 6, wherein each shoe of said first plurality of shoes defines an inclined surface, said inclined surface being disposed in a first plane which converges in a machine direction with said first wire, said surface extending from said channel to said first wire.
10. A forming apparatus as set forth in claim 7, wherein each shoe of said second plurality of shoes defines an inclined face, said inclined face being disposed in a second plane which converges in a machine direction with said second wire, said face extending from said slot to said second wire.
11. A forming apparatus as set forth in claim 1, further including:
means for adjusting the distance between said first and second plurality of shoes for controlling pressure pulses applied to the stock during passage of the stock through said forming section.
means for adjusting the distance between said first and second plurality of shoes for controlling pressure pulses applied to the stock during passage of the stock through said forming section.
12. A forming apparatus as set forth in claim 11, wherein said means includes:
a pressure vessel connected to said channels;
control means for controlling the flow of water through said channels.
a pressure vessel connected to said channels;
control means for controlling the flow of water through said channels.
13. A forming apparatus as set forth in claim 12, wherein said pressure vessel includes:
a first and second compartment disposed in a machine direction;
said control means including:
a first and a second control valve for controlling the flow of water from said first and second compartments so that downward drainage in a machine direction can be controlled by said control valves.
a first and second compartment disposed in a machine direction;
said control means including:
a first and a second control valve for controlling the flow of water from said first and second compartments so that downward drainage in a machine direction can be controlled by said control valves.
14. A forming apparatus as set forth in claim 1, wherein said forming section is disposed substantially horizontal, said forming apparatus further including:
an upper container, said upper container defining a first and second enclosure, said enclosures being selectively connected to a source of partial pressure for controlling the upward dewatering of the stock.
an upper container, said upper container defining a first and second enclosure, said enclosures being selectively connected to a source of partial pressure for controlling the upward dewatering of the stock.
15. A method for forming a web from stock, said method comprising the steps of:
ejecting a jet of the stock from a headbox;
moving a first and a second wire such that the wires cooperate together to define therebetween a forming section having a first and a second end, the wires being disposed contiguously relative to each other from the first to the second end, the first end of the forming section being disposed closely adjacent to the headbox;
moving the first wire over a first plurality of shoes such that water drains from the stock through the first wire and through a first plurality of channels defined by the first plurality of shoes;
moving the second wire such that the second wire extends past a second plurality of shoes so that water drains from the stock through the second wire and through a plurality of slots defined by the second plurality of shoes;
staggering the first plurality of shoes relative to the second plurality of shoes for enhancing the dispersion of fibres within the stock during the formation of the web; and passing the first and the second wire around a first and second turning bar respectively, the turning bar is being disposed between the headbox and the first end of the moving section such that the jet of stock moves from the headbox to the forming section between the first and second turning bars.
ejecting a jet of the stock from a headbox;
moving a first and a second wire such that the wires cooperate together to define therebetween a forming section having a first and a second end, the wires being disposed contiguously relative to each other from the first to the second end, the first end of the forming section being disposed closely adjacent to the headbox;
moving the first wire over a first plurality of shoes such that water drains from the stock through the first wire and through a first plurality of channels defined by the first plurality of shoes;
moving the second wire such that the second wire extends past a second plurality of shoes so that water drains from the stock through the second wire and through a plurality of slots defined by the second plurality of shoes;
staggering the first plurality of shoes relative to the second plurality of shoes for enhancing the dispersion of fibres within the stock during the formation of the web; and passing the first and the second wire around a first and second turning bar respectively, the turning bar is being disposed between the headbox and the first end of the moving section such that the jet of stock moves from the headbox to the forming section between the first and second turning bars.
16
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US26519088A | 1988-10-31 | 1988-10-31 | |
| US07/265,190 | 1988-10-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1331531C true CA1331531C (en) | 1994-08-23 |
Family
ID=23009394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000615189A Expired - Fee Related CA1331531C (en) | 1988-10-31 | 1989-09-28 | Forming apparatus |
Country Status (6)
| Country | Link |
|---|---|
| KR (1) | KR0121881B1 (en) |
| AU (1) | AU4307889A (en) |
| CA (1) | CA1331531C (en) |
| ES (1) | ES2016767A6 (en) |
| MX (1) | MX172494B (en) |
| WO (1) | WO1990005210A1 (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3403073A (en) * | 1964-05-20 | 1968-09-24 | Time Inc | Paper-forming method and apparatus |
| BE759451R (en) * | 1970-11-26 | 1971-04-30 | Beloit Corp | Vertical paper-making machines |
| FI63077C (en) * | 1977-09-21 | 1983-04-11 | Tampella Oy Ab | PROCEDURE FOR THE ADJUSTMENT OF PROFILES IN FIBER BANKS AND IN PAPER MACHINES |
| DE3153305C2 (en) * | 1981-09-04 | 1986-10-23 | Sulzer-Escher Wyss GmbH, 7980 Ravensburg | Drainage unit for Fourdrinier paper machines |
| FI840246A (en) * | 1984-01-20 | 1985-07-21 | Valmet Oy | FOERFARANDE OCH ANORDNING VID FORMNING AV PAPPERSBANA. |
| JPS6189398A (en) * | 1984-10-03 | 1986-05-07 | 三菱重工業株式会社 | Paper layer forming apparatus |
| FI82084C (en) * | 1985-01-28 | 1991-01-10 | Valmet Oy | Upper virus unit |
| FI862808A (en) * | 1986-07-02 | 1988-01-03 | Ahlstroem Oy | FOERFARANDE OCH ANORDNING FOER AVVATTNING AV EN FIBERBANA. |
-
1989
- 1989-09-06 AU AU43078/89A patent/AU4307889A/en not_active Abandoned
- 1989-09-06 WO PCT/US1989/003847 patent/WO1990005210A1/en unknown
- 1989-09-28 CA CA000615189A patent/CA1331531C/en not_active Expired - Fee Related
- 1989-10-30 ES ES8903668A patent/ES2016767A6/en not_active Expired - Fee Related
- 1989-10-31 MX MX018180A patent/MX172494B/en unknown
-
1990
- 1990-07-02 KR KR90701413A patent/KR0121881B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| ES2016767A6 (en) | 1990-11-16 |
| AU4307889A (en) | 1990-05-28 |
| KR900702136A (en) | 1990-12-05 |
| MX172494B (en) | 1993-12-17 |
| KR0121881B1 (en) | 1997-11-13 |
| WO1990005210A1 (en) | 1990-05-17 |
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| Date | Code | Title | Description |
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| MKLA | Lapsed |