CA2080397A1 - Device for application of coating color on a fiber web - Google Patents
Device for application of coating color on a fiber webInfo
- Publication number
- CA2080397A1 CA2080397A1 CA002080397A CA2080397A CA2080397A1 CA 2080397 A1 CA2080397 A1 CA 2080397A1 CA 002080397 A CA002080397 A CA 002080397A CA 2080397 A CA2080397 A CA 2080397A CA 2080397 A1 CA2080397 A1 CA 2080397A1
- Authority
- CA
- Canada
- Prior art keywords
- distribution pipe
- coating
- web
- coating mixture
- nozzle space
- 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
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
- D21H23/34—Knife or blade type coaters
- D21H23/36—Knife or blade forming part of the fluid reservoir, e.g. puddle-type trailing blade or short-dwell coaters
Landscapes
- Coating Apparatus (AREA)
- Paper (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Saccharide Compounds (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
ABSTRACT
The invention concerns a nozzle type coating device for application of a coating mixture on a running paper web. A
nozzle space is defined on the entrance end by an overflow slat and on the exit end by a dosing slat; there is a distribution pipe provided which features bores distributed across its length, for issuing coating mixture; the distribution pipe is followed by a feed channel which passes the coating mixture to the nozzle space; and there is a drain channel provided which drains the surplus from the nozzle space. The distribution pipe features on one of its two ends an inlet and on its other end an outlet;
there are inserts provided which are installed in the wall of the distribution pipe and feature bores therein.
The invention concerns a nozzle type coating device for application of a coating mixture on a running paper web. A
nozzle space is defined on the entrance end by an overflow slat and on the exit end by a dosing slat; there is a distribution pipe provided which features bores distributed across its length, for issuing coating mixture; the distribution pipe is followed by a feed channel which passes the coating mixture to the nozzle space; and there is a drain channel provided which drains the surplus from the nozzle space. The distribution pipe features on one of its two ends an inlet and on its other end an outlet;
there are inserts provided which are installed in the wall of the distribution pipe and feature bores therein.
Description
2~80397 ~EVICE FOR APPL~CATION OF COATING COLO~
ON A FIBER ~
Tho invention is diract~ to a nozzle ~ypo coating dev$ce for application Of a Coati~g mixtur~ on a running p~per web.
Cevice~ o~ this type may be arranged wlthin or outside a paper machine. I~he liguld to ~a ~pplied, e.g., may bQ a 8~ze suspensi~n ~or ~mpregna~ion o~ tho paper web; l.e., the ~ize Bu~pen~ on penetr~t~ the int~rlor o~ the paper web mor~ o~ le~
complet~ly. BUt the liquid m~y also be a ~oating ~ixture; me~nt thareby are pigment ~uspen~ions of mo~t varled type of which ~
finl6h coat i6 ~ormed on th~ paper we~. In both case~, th~ liquid ~ay be applied on only one 6ide or on both sldes of the pap~r web.
RepresQntativ~ prior art includeo: German utility patent g 111 669; Ger~an utility p~tont 8 414 413; U.S. Patent No.
2,729,192; U.S. Patent No. 2,946,307; U.S. Patent No.
ON A FIBER ~
Tho invention is diract~ to a nozzle ~ypo coating dev$ce for application Of a Coati~g mixtur~ on a running p~per web.
Cevice~ o~ this type may be arranged wlthin or outside a paper machine. I~he liguld to ~a ~pplied, e.g., may bQ a 8~ze suspensi~n ~or ~mpregna~ion o~ tho paper web; l.e., the ~ize Bu~pen~ on penetr~t~ the int~rlor o~ the paper web mor~ o~ le~
complet~ly. BUt the liquid m~y also be a ~oating ~ixture; me~nt thareby are pigment ~uspen~ions of mo~t varled type of which ~
finl6h coat i6 ~ormed on th~ paper we~. In both case~, th~ liquid ~ay be applied on only one 6ide or on both sldes of the pap~r web.
RepresQntativ~ prior art includeo: German utility patent g 111 669; Ger~an utility p~tont 8 414 413; U.S. Patent No.
2,729,192; U.S. Patent No. 2,946,307; U.S. Patent No.
3,084,663; Woch~nbl3tt f~r Papierfa~rikatlon (Papermaking Weekly) 1973, pageB 164 through 169; and Wochen~latt ~r Papier~abrikation (~apermaking We~kly) 1978, pag~s 773 through 778.
~he coating ~uality in ooater~ o~ any ~ype depenas deci~lvely on all of the event~ occurring along ths entlre p~th of the coating mixtu~e up to its application on the paper web.
Here, the di~tributlon pipe play~ a dominant role, servlng the uniform distr~ution of the coating mixtur~ acro3s the wid~h o~
th~ paper ~eb. Thls d~stri~utlon pipe i6 withln th~ coat~r in horizontal position. It ie on both ~nd~ charged with coating mlxture ~lows. Ths~e have thus oppo~its direction ~he coati~g mixture di~charges fro~ ths di~trlbutlo~ plpe via bores which 2re arrsnged acro~ the length of the d~stribut~on pipe. ~hus, th~
veloclty in s~id c~ating mixture ~1DW~ i~ being diminis~d on the ~low path, beginning at the respective ond side and endlng in the center area o~ th- distribution pipe length. W~th proper de~ign, the two par~ial flows ~hould there~ore come to rest in the center area.
A decisi~- disturban~e factor is alwaye alr contained ln the coating mixture. Tbis air must be lim~natea at any rate before the coatlng mixture reachos the paper web. All sorts of deaera~lon mea~ures have bBen used for that purpose. InRtalled on the dlstribution plpe, ~or example, i8 a ~eaeration dome which xtends acros~ the ntire length of the dlstribution plpe and communicates with the interlor ~ the di6tributlon p~pe ~ia ~urther ~ores. A small partial flow la~en to a greater degree with alr bubble~ leaves the distribut1on pipB th~ough the~e bores and enters the ~aid channel ~or being returned again to the lS circula~ion.
The illu~trated prlnciple o~ the known di~tributlon pipe ~
problemat$c. For instAnce, it is difflcult to ~ccomplish tha~ the two pAr~ial ~lows o~ the coating mixture actually roach a veloclty of zero in the center a~ea. Tha ~eedlnq from both ond~
requlres a oertain equlpment expense. The ~ecirculation rlow proceeding through th~ deaeratlon doms b-ing ~mall ln size, the ~Qloclty 16 low as well. Thl6 result6 ln deposlts, and at that, already in the bore6 between distribut~on pipe and deaQrstlon do~e. ~as~ly, the di~tribu~io~ it~elf is not optimal either, and ~5 at that, due to the ~eloclty ~eduction of the partlal f 10WB on thQ ~y between th- entrance to the di~trlbution pipe and the center area of the di~tri~ution plpe length.
The probl~m underlying the present inven~ion iB to ~a~hion su~h a devlce to the e~fect that the coatin~ substance wlll ~e maxlmally evenly di~tributed across the length o~ the di6tribution pipe, ~nd thus a~ro6~ the width o~ the paper web, that tha deaeration problem w~ll bo solved flawle3sly, that d-po-lt6 wlll be avolded and the equipm-nt expen~e will be rQduc-d.
It is an object of the present invention to provide a nozzle type coating device having a distribution pipe featuring on one of its two ends an inlet an don its other end an outlet. Inserts having bores therein are installed in the wall of the distribution pipe for allowing coating mixture to flow therethrough.
In d-tall, tne invention ~ccompli-h~s the following The eoatlng mlxture i- now pAssed through the entlre length Or th-d~trlbution plp-, from one end to the other, without any ~tand-till occurring Thu~, the coating ~lxture i- con~tantly in motlon acro-- th~ entlre pipQ length Th- ~ore alr-lad-n part on this ~low path - vi-w~d ln a cro~s ~ection through th-di6tributlon pip- - 16 containcd ~n it~ upper part, and thu~ on the ide oppo-ite the bore~ For that rea-on ther- i~ no ri~k of air-lad~n coatlng mixt~r~ proc~edlng through th- bore-Th-r-fore, a deaeration dome 1B ~-nerally no longar noc~ ry at all, although it mAy b- provided Furth-rmore, the conBtructlon expenB- 1B gr-~tly r-duced a~
compared to prlor coating dev~c~ incQ only ~ ingle feed l~ne i~ provlded now to on- end o~ the d~atrl~utlon plpe La-tly, the bore dl~m te~- ~ay be ohang-d at any ti~e, thu-ad~u6ting a1BO the partial a~ount ls-ulng out of the re-pective bore; for all that i- need~d is ch~nging the inoert~ ~hl- ha~
the adv~ntage th~t th- piFe may ln ~om~ case- b- cylindr~cal, ~ e , have a con-t~nt cros6 ectlon acro6- th- entlr- length or at least crosc a~ ~6-ntlal part of lt- l-ngth Thi~ ~cilitates the manufactur- and, thu~, low-rc the manu~acturing cost- B~t the plpe may al~o be conical ln ~-~lgn A preferred embodiment of the invention will be more fully explained by way of example only, with the aid of the drawings, in which:
Fig. 1 18 A slde oect1onal vi-w o~ a coatlng d-vlce Or the pr-~-nt invention;
F~g 2 i- a ~-c~$onal vi-w of the di~tr$bution p1pe accordlng to Flq. l; And Fig 3 i- an nlarged sectlonal vi-w tak-n a~ong llne I~I-III ln Fiq 2 ~h- nozzle typ- coatlng devic- lllustrated in F~g f-ature6 a nozzle spaoe 3 In the running dlrection of tho web, this nozzle pace is def$ned by an ovQrflow lat 4 and a doslng 61at 5 Coating o~bstance i~ fed to a di6tri~ut~ on plpe 6 The distrlbu~ion plpe 6 ~as a number of outlet opening~, which are not illu~trated here and communlcate with a reed channel 7, ~o that the coat$ng ~ixt~re proceeda through the channel 7 to the nozzle ~pace 3, ~nd thu~ to the pap-r web 1 Located hal~way in th~ ~eed channel ar- the ~poiler bars 7 1 producing a 2~ microturbul-nce in the coating mixture A drain channel 8 establi-he6 a conductive connection to an over~low chute 9 Located at the nd of th- w~rking channel 8 16 an adjustable valve 10 for control o~ the amount of o~errlow A d-vic- 11 erv-s to control the ~lexural co~pen~ation What matt-rs here 1 pecl~ically t~e ~lexur~l co~pansation of tho do~lng 61at 5 However, also t~o ~1QXUre 0~ the ~ntire coatlng device can be in~luenced The compen-ation device 11 ~- preoently de6ignsd according to D~ 39 2S 5~7 A1 It fe~tures a otatlonsry yoke 12, a sleeve 13 surrounding the yoke 12, and pr-06ure trans~er lements 14, pre-ently air b~llows Charging the air bellows with compressed alr changes the position o~ the eleeve 13, and thus al~o t~at of t~Q dosing slat 5, thereby effectlng a ~ompensa~ion Or flexure.
T~e desl~n and arr2ngement o~ the compQn~tion device 11 mAy be ~uch that a surficlently large "inner stroke" is created for ad~usting also the width of the qap ~etween thQ edge o~ the 5 dosing slat 5 and t~e paper web 1. Thu~, no further device ~ B
requlred for tha~ purpose. Provldad in the present case i8 a laser measur~ng devlca 15 for dQterminlng the Qxact po~ltlon of the edge o~ the dosing ~lat 5. A s~gnal obtained thereby i8 used for control of th~ compensation device 11.
Details of the dlstrlbu~ion pipe 6 can be soen ~ore exactly ~rom Fig. 2 and 3. The distribution plpe ~ has a cylln~rlcal shape, and at that, pre6ently ~hat of a circular cylin~er. The distribution pipe ~ has an entrance end 20 and an exit end 21.
ContalnQd in exit end 21 i5 a con~txiction member 22. Ins~rts 24 are arranqed across the length o~ distribution pipe 6 - inalcated only 6chematically $n Flg. 2. The flow i8 in the directlon o~
arrow 25.
The cross-se~tional lllustration according to Fig. 3 dep~cts the inserts 24 more accurat~ly. They ~eature bore~ 25 having a certain di~meter d. The interior of the distr~butlon pipe 6 ls extQnsively fil~ed with coating mixture. But there are also alr bubbles 28 visible, in Flg. 2 and 3, ln the upper area of the interior space. ~he flow proceeding inventionally from the entrance end to the exit end, ~ considerable ~eloci~y prevail~
across the entiro length of the di-trlbutlon pipe. A 6tandstill of ths flow occ~r6 nowhere. ~herefore, also the air bubbles 28 migrate dep~ndably through the sntire di~trlbution pipe. Thcy are contained - as illustrated in Fig. 3 - alway~ oppo3ite the bores 26, ~o tha~ at an~ rate they canno~ exit with the ooating mixture througn th~ bores and thu~ not proceed eith~r to the paper web .
The bores 26 in the in3erts 24 dif~er in ~iza from insart ~o insert. Generally, the dimension d in~r~a~ea ~lowly wlth the increaslng ~low, starting from the entrance end 20, up to the exit ~nd 21. The dl~-n~ion d of tho individual bores can b~
detormlned rather accurately ahead ot tlme by computatlon. The ob~ectlvo ln this ia to ~a~ion ~he dimen~ion d Or the inoert~ $n such a way that the ame partlal amoun~ of coatlng mixture will xit from each bore 26, ao that the coatlng ~ixture will ~
distrlbuted maxlmally unlformly across the length of distr$butlon plpe 6 and thue aaro~6 the wldth of the paper we~.
In6erts 24 are eaaily exchangeable. For example, insert~ 24 may be fa6tened in the wall of the di6trlbution pipe 6 by threadlng or clamping with a snap e~fect. Th- meaning Or 1~ 1 this: the rheological behavior of coat1ng ~ixtures differs qreatly. It ia mostly completely dlfferent ~rom that of water.
~he ~low performance can frequently not be computed xactly.
Therefore, $t ia ultable to ma~e the in~ort~ eaaily exchangea~le. Then it i8 ea6y to cnange over to bores wlth di~-r-nt diamet~rs in order to achieve con6tant partial amount~
at all bores.
Pro6ently, diatribution pipe 6, a~ shown in Fig. 3, ha~ a circ~larly cylindrical shape. But lt may alao have an elliptic cross a-ction. The longitudinal axls o~ t~e elllpa~s li-s then in a vertical plane. Thls has th~ ad~antag~ that with a glven croa--6ectional area of the interior 6pace the tistance between ~he borea 26, for one, and the opposite point at which the a~r ?5 bu~ble~ flow, for ~nother, $s maximally large, precluding the r$sk that air bubbles proce~d to the bore3.
~he coating ~uality in ooater~ o~ any ~ype depenas deci~lvely on all of the event~ occurring along ths entlre p~th of the coating mixtu~e up to its application on the paper web.
Here, the di~tributlon pipe play~ a dominant role, servlng the uniform distr~ution of the coating mixtur~ acro3s the wid~h o~
th~ paper ~eb. Thls d~stri~utlon pipe i6 withln th~ coat~r in horizontal position. It ie on both ~nd~ charged with coating mlxture ~lows. Ths~e have thus oppo~its direction ~he coati~g mixture di~charges fro~ ths di~trlbutlo~ plpe via bores which 2re arrsnged acro~ the length of the d~stribut~on pipe. ~hus, th~
veloclty in s~id c~ating mixture ~1DW~ i~ being diminis~d on the ~low path, beginning at the respective ond side and endlng in the center area o~ th- distribution pipe length. W~th proper de~ign, the two par~ial flows ~hould there~ore come to rest in the center area.
A decisi~- disturban~e factor is alwaye alr contained ln the coating mixture. Tbis air must be lim~natea at any rate before the coatlng mixture reachos the paper web. All sorts of deaera~lon mea~ures have bBen used for that purpose. InRtalled on the dlstribution plpe, ~or example, i8 a ~eaeration dome which xtends acros~ the ntire length of the dlstribution plpe and communicates with the interlor ~ the di6tributlon p~pe ~ia ~urther ~ores. A small partial flow la~en to a greater degree with alr bubble~ leaves the distribut1on pipB th~ough the~e bores and enters the ~aid channel ~or being returned again to the lS circula~ion.
The illu~trated prlnciple o~ the known di~tributlon pipe ~
problemat$c. For instAnce, it is difflcult to ~ccomplish tha~ the two pAr~ial ~lows o~ the coating mixture actually roach a veloclty of zero in the center a~ea. Tha ~eedlnq from both ond~
requlres a oertain equlpment expense. The ~ecirculation rlow proceeding through th~ deaeratlon doms b-ing ~mall ln size, the ~Qloclty 16 low as well. Thl6 result6 ln deposlts, and at that, already in the bore6 between distribut~on pipe and deaQrstlon do~e. ~as~ly, the di~tribu~io~ it~elf is not optimal either, and ~5 at that, due to the ~eloclty ~eduction of the partlal f 10WB on thQ ~y between th- entrance to the di~trlbution pipe and the center area of the di~tri~ution plpe length.
The probl~m underlying the present inven~ion iB to ~a~hion su~h a devlce to the e~fect that the coatin~ substance wlll ~e maxlmally evenly di~tributed across the length o~ the di6tribution pipe, ~nd thus a~ro6~ the width o~ the paper web, that tha deaeration problem w~ll bo solved flawle3sly, that d-po-lt6 wlll be avolded and the equipm-nt expen~e will be rQduc-d.
It is an object of the present invention to provide a nozzle type coating device having a distribution pipe featuring on one of its two ends an inlet an don its other end an outlet. Inserts having bores therein are installed in the wall of the distribution pipe for allowing coating mixture to flow therethrough.
In d-tall, tne invention ~ccompli-h~s the following The eoatlng mlxture i- now pAssed through the entlre length Or th-d~trlbution plp-, from one end to the other, without any ~tand-till occurring Thu~, the coating ~lxture i- con~tantly in motlon acro-- th~ entlre pipQ length Th- ~ore alr-lad-n part on this ~low path - vi-w~d ln a cro~s ~ection through th-di6tributlon pip- - 16 containcd ~n it~ upper part, and thu~ on the ide oppo-ite the bore~ For that rea-on ther- i~ no ri~k of air-lad~n coatlng mixt~r~ proc~edlng through th- bore-Th-r-fore, a deaeration dome 1B ~-nerally no longar noc~ ry at all, although it mAy b- provided Furth-rmore, the conBtructlon expenB- 1B gr-~tly r-duced a~
compared to prlor coating dev~c~ incQ only ~ ingle feed l~ne i~ provlded now to on- end o~ the d~atrl~utlon plpe La-tly, the bore dl~m te~- ~ay be ohang-d at any ti~e, thu-ad~u6ting a1BO the partial a~ount ls-ulng out of the re-pective bore; for all that i- need~d is ch~nging the inoert~ ~hl- ha~
the adv~ntage th~t th- piFe may ln ~om~ case- b- cylindr~cal, ~ e , have a con-t~nt cros6 ectlon acro6- th- entlr- length or at least crosc a~ ~6-ntlal part of lt- l-ngth Thi~ ~cilitates the manufactur- and, thu~, low-rc the manu~acturing cost- B~t the plpe may al~o be conical ln ~-~lgn A preferred embodiment of the invention will be more fully explained by way of example only, with the aid of the drawings, in which:
Fig. 1 18 A slde oect1onal vi-w o~ a coatlng d-vlce Or the pr-~-nt invention;
F~g 2 i- a ~-c~$onal vi-w of the di~tr$bution p1pe accordlng to Flq. l; And Fig 3 i- an nlarged sectlonal vi-w tak-n a~ong llne I~I-III ln Fiq 2 ~h- nozzle typ- coatlng devic- lllustrated in F~g f-ature6 a nozzle spaoe 3 In the running dlrection of tho web, this nozzle pace is def$ned by an ovQrflow lat 4 and a doslng 61at 5 Coating o~bstance i~ fed to a di6tri~ut~ on plpe 6 The distrlbu~ion plpe 6 ~as a number of outlet opening~, which are not illu~trated here and communlcate with a reed channel 7, ~o that the coat$ng ~ixt~re proceeda through the channel 7 to the nozzle ~pace 3, ~nd thu~ to the pap-r web 1 Located hal~way in th~ ~eed channel ar- the ~poiler bars 7 1 producing a 2~ microturbul-nce in the coating mixture A drain channel 8 establi-he6 a conductive connection to an over~low chute 9 Located at the nd of th- w~rking channel 8 16 an adjustable valve 10 for control o~ the amount of o~errlow A d-vic- 11 erv-s to control the ~lexural co~pen~ation What matt-rs here 1 pecl~ically t~e ~lexur~l co~pansation of tho do~lng 61at 5 However, also t~o ~1QXUre 0~ the ~ntire coatlng device can be in~luenced The compen-ation device 11 ~- preoently de6ignsd according to D~ 39 2S 5~7 A1 It fe~tures a otatlonsry yoke 12, a sleeve 13 surrounding the yoke 12, and pr-06ure trans~er lements 14, pre-ently air b~llows Charging the air bellows with compressed alr changes the position o~ the eleeve 13, and thus al~o t~at of t~Q dosing slat 5, thereby effectlng a ~ompensa~ion Or flexure.
T~e desl~n and arr2ngement o~ the compQn~tion device 11 mAy be ~uch that a surficlently large "inner stroke" is created for ad~usting also the width of the qap ~etween thQ edge o~ the 5 dosing slat 5 and t~e paper web 1. Thu~, no further device ~ B
requlred for tha~ purpose. Provldad in the present case i8 a laser measur~ng devlca 15 for dQterminlng the Qxact po~ltlon of the edge o~ the dosing ~lat 5. A s~gnal obtained thereby i8 used for control of th~ compensation device 11.
Details of the dlstrlbu~ion pipe 6 can be soen ~ore exactly ~rom Fig. 2 and 3. The distribution plpe ~ has a cylln~rlcal shape, and at that, pre6ently ~hat of a circular cylin~er. The distribution pipe ~ has an entrance end 20 and an exit end 21.
ContalnQd in exit end 21 i5 a con~txiction member 22. Ins~rts 24 are arranqed across the length o~ distribution pipe 6 - inalcated only 6chematically $n Flg. 2. The flow i8 in the directlon o~
arrow 25.
The cross-se~tional lllustration according to Fig. 3 dep~cts the inserts 24 more accurat~ly. They ~eature bore~ 25 having a certain di~meter d. The interior of the distr~butlon pipe 6 ls extQnsively fil~ed with coating mixture. But there are also alr bubbles 28 visible, in Flg. 2 and 3, ln the upper area of the interior space. ~he flow proceeding inventionally from the entrance end to the exit end, ~ considerable ~eloci~y prevail~
across the entiro length of the di-trlbutlon pipe. A 6tandstill of ths flow occ~r6 nowhere. ~herefore, also the air bubbles 28 migrate dep~ndably through the sntire di~trlbution pipe. Thcy are contained - as illustrated in Fig. 3 - alway~ oppo3ite the bores 26, ~o tha~ at an~ rate they canno~ exit with the ooating mixture througn th~ bores and thu~ not proceed eith~r to the paper web .
The bores 26 in the in3erts 24 dif~er in ~iza from insart ~o insert. Generally, the dimension d in~r~a~ea ~lowly wlth the increaslng ~low, starting from the entrance end 20, up to the exit ~nd 21. The dl~-n~ion d of tho individual bores can b~
detormlned rather accurately ahead ot tlme by computatlon. The ob~ectlvo ln this ia to ~a~ion ~he dimen~ion d Or the inoert~ $n such a way that the ame partlal amoun~ of coatlng mixture will xit from each bore 26, ao that the coatlng ~ixture will ~
distrlbuted maxlmally unlformly across the length of distr$butlon plpe 6 and thue aaro~6 the wldth of the paper we~.
In6erts 24 are eaaily exchangeable. For example, insert~ 24 may be fa6tened in the wall of the di6trlbution pipe 6 by threadlng or clamping with a snap e~fect. Th- meaning Or 1~ 1 this: the rheological behavior of coat1ng ~ixtures differs qreatly. It ia mostly completely dlfferent ~rom that of water.
~he ~low performance can frequently not be computed xactly.
Therefore, $t ia ultable to ma~e the in~ort~ eaaily exchangea~le. Then it i8 ea6y to cnange over to bores wlth di~-r-nt diamet~rs in order to achieve con6tant partial amount~
at all bores.
Pro6ently, diatribution pipe 6, a~ shown in Fig. 3, ha~ a circ~larly cylindrical shape. But lt may alao have an elliptic cross a-ction. The longitudinal axls o~ t~e elllpa~s li-s then in a vertical plane. Thls has th~ ad~antag~ that with a glven croa--6ectional area of the interior 6pace the tistance between ~he borea 26, for one, and the opposite point at which the a~r ?5 bu~ble~ flow, for ~nother, $s maximally large, precluding the r$sk that air bubbles proce~d to the bore3.
Claims (4)
1 A nozzle type coating device for application of a coating fixture on a running paper web, comprising a nozzle space extending across the width of the web and, in the running direction of the web, across a certain travel distance of the web, said nozzle space including an entrance end defining an overflow slat, and an exit end defining a dosing slat;
a distribution pipe extending traverse to the running direction of the web, said distribution pipe including a first end having an inlet and a said second end having an outlet, said distribution pipe receiving coating mixture at said first end, said distribution pipe including inserts installed in a wall thereof which are distributed across the length of said distribution pipe, said inserts each having a bore formed therein for issuing coating mixture;
a feed channel in communication with said distribution pipe for supplying the coating mixture to said nozzle space; and a drain channel for draining a surplus of coating mixture from said nozzle space.
a distribution pipe extending traverse to the running direction of the web, said distribution pipe including a first end having an inlet and a said second end having an outlet, said distribution pipe receiving coating mixture at said first end, said distribution pipe including inserts installed in a wall thereof which are distributed across the length of said distribution pipe, said inserts each having a bore formed therein for issuing coating mixture;
a feed channel in communication with said distribution pipe for supplying the coating mixture to said nozzle space; and a drain channel for draining a surplus of coating mixture from said nozzle space.
2. A coating device according to claim 1, wherein said distribution pipe comprises a cylindrical pipe across an essential part of the length of said distribution pipe.
3. A coating device according to claim 1, wherein said second end of said distribution pipe comprises a constricting element.
4. A coating device according to claim 2, wherein said second end of said distribution pipe comprises a constricting element.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19914133501 DE4133501C2 (en) | 1991-10-10 | 1991-10-10 | Device for applying coating color on a fibrous web |
| DEP4133501.5 | 1991-10-10 | ||
| DEP4229602.1 | 1992-09-04 | ||
| DE4229602 | 1992-09-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2080397A1 true CA2080397A1 (en) | 1993-04-11 |
Family
ID=25908089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002080397A Abandoned CA2080397A1 (en) | 1991-10-10 | 1992-10-13 | Device for application of coating color on a fiber web |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0536649B1 (en) |
| JP (1) | JPH05212338A (en) |
| AT (1) | ATE125895T1 (en) |
| CA (1) | CA2080397A1 (en) |
| DE (1) | DE59203096D1 (en) |
| FI (1) | FI924248L (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2732678A1 (en) * | 1977-07-20 | 1979-02-01 | Barmag Barmer Maschf | Spinning method - using air currents to direct fibres into a yarn-forming zone between revolving cylinders |
| DE2803904C2 (en) * | 1978-01-30 | 1986-07-03 | Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid | Open-end spinning process and spinning device |
| GB2042599B (en) * | 1978-10-26 | 1983-09-21 | Platt Saco Lowell Ltd | Open-end spinning apparatus |
| DE29520686U1 (en) * | 1995-12-29 | 1996-04-04 | Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim | Applicator for direct or indirect application of a liquid or pasty medium to a running material web |
| DE29613313U1 (en) * | 1996-08-01 | 1996-10-02 | Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim | Distribution device with distribution pipe for a commissioned work |
| DE19751098C2 (en) * | 1997-11-18 | 2003-02-20 | Voith Paper Patent Gmbh | Method and device for adjusting an elongate component, which extends in the width direction of a running material web |
| DE19755625A1 (en) * | 1997-12-15 | 1999-07-01 | Jagenberg Papiertech Gmbh | Slot nozzle for coating material webs, in particular paper or cardboard webs with pigment coating ink |
| EP3180475B2 (en) | 2014-08-15 | 2021-11-03 | Voith Patent GmbH | Coating device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4116729C2 (en) * | 1991-05-23 | 1993-11-25 | Voith Gmbh J M | Nozzle-like coating device for applying a coating slip to a running paper web |
| DE9106311U1 (en) * | 1991-05-23 | 1991-07-25 | J.M. Voith Gmbh, 7920 Heidenheim | Nozzle-like coating device for applying coating material to a paper web |
-
1992
- 1992-09-22 FI FI924248A patent/FI924248L/en not_active Application Discontinuation
- 1992-10-02 EP EP92116870A patent/EP0536649B1/en not_active Expired - Lifetime
- 1992-10-02 DE DE59203096T patent/DE59203096D1/en not_active Expired - Lifetime
- 1992-10-02 AT AT92116870T patent/ATE125895T1/en active
- 1992-10-09 JP JP4272018A patent/JPH05212338A/en active Pending
- 1992-10-13 CA CA002080397A patent/CA2080397A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05212338A (en) | 1993-08-24 |
| FI924248L (en) | 1993-04-11 |
| FI924248A0 (en) | 1992-09-22 |
| EP0536649A1 (en) | 1993-04-14 |
| ATE125895T1 (en) | 1995-08-15 |
| DE59203096D1 (en) | 1995-09-07 |
| EP0536649B1 (en) | 1995-08-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 19971014 |