CA2069344A1 - Nozzle type coater for application of a coating mixture on a paper web - Google Patents
Nozzle type coater for application of a coating mixture on a paper webInfo
- Publication number
- CA2069344A1 CA2069344A1 CA002069344A CA2069344A CA2069344A1 CA 2069344 A1 CA2069344 A1 CA 2069344A1 CA 002069344 A CA002069344 A CA 002069344A CA 2069344 A CA2069344 A CA 2069344A CA 2069344 A1 CA2069344 A1 CA 2069344A1
- Authority
- CA
- Canada
- Prior art keywords
- web
- slat
- overflow
- coating
- coating mixture
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
- B05C11/1039—Recovery of excess liquid or other fluent material; Controlling means therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
- B05C3/18—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material only one side of the work coming into contact with the liquid or other fluent material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
- B05C3/005—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material incorporating means for heating or cooling the liquid or other fluent material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
- B05C5/0283—Flat jet coaters, i.e. apparatus in which the liquid or other fluent material is projected from the outlet as a cohesive flat jet in direction of the work
Landscapes
- Coating Apparatus (AREA)
- Paper (AREA)
- Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
- Pens And Brushes (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A nozzle type coater for application of a coating mixture on a running paper web. A nozzle space extends across the entire web width, and is defined on the entrance side of the web by an overflow slat and on the exit side of the web by a dosing slat.
A distribution pipe distributes the coating mixture across the web width, and a feed channel feeds coating mixture from the distribution pipe at surplus to the nozzle space. A drain chan-nel is provided for surplus coating removal from the nozzle space.
The feed channel empties on that side of the coater where the paper web enters. The drain channel is connected to an overflow chute, which at the same time collects the overflow from the overflow slat. A compensation device extends across the entire web width and comprises a fixed yoke, a sleeve surrounding it and adjustable toward the paper web, and adjustable pressure transfer elements. A flow element is provided, around which flows the coating mixture. Viewed in side elevation and in the web running direction, the elements distribution pipe, flow element and compensation device are successively arranged.
A nozzle type coater for application of a coating mixture on a running paper web. A nozzle space extends across the entire web width, and is defined on the entrance side of the web by an overflow slat and on the exit side of the web by a dosing slat.
A distribution pipe distributes the coating mixture across the web width, and a feed channel feeds coating mixture from the distribution pipe at surplus to the nozzle space. A drain chan-nel is provided for surplus coating removal from the nozzle space.
The feed channel empties on that side of the coater where the paper web enters. The drain channel is connected to an overflow chute, which at the same time collects the overflow from the overflow slat. A compensation device extends across the entire web width and comprises a fixed yoke, a sleeve surrounding it and adjustable toward the paper web, and adjustable pressure transfer elements. A flow element is provided, around which flows the coating mixture. Viewed in side elevation and in the web running direction, the elements distribution pipe, flow element and compensation device are successively arranged.
Description
2~69344 NOZZLE TY~E COATE~ FOR APPLICATION
F ~ Q~ IN~-MI-x~ QN A PAPER WEB
The invention concerns a nozzle type coater for application of a coating mixture on a paper web, with a nozzle space extending across the web width and defined on the entrance side of the web by an overflow slat and on the exit side o~ the web by a dosing ~lat. A distribution pipe di6tributes the coating mixture across the web width, and a feed channel feeds coating mixture from the distribution pipe at surplus to the nozzle space. A drain channel removes surplus coating mixture from the nozzle space.
Such a coater is known from P 3 446 757. Its ob~ective is removing the comparatively large surplus quantities from the nozzle space without causing thereby the intake of air in the area of the overflow slat.
A number of similar nozzle applicators have become known. As examples, reference is made to United States patent 3,518,964 United States patent 4,250,211 Voith company publication of October, 1987, page 2766.
Space conditions are generally congested. Therefore, there is a general need to give coaters of the initially named type a design as compact as possible. At the same time, however, certain technological requirements are to be met. For instance, the advantages according to the teaching (1) are to be retained, that is, a so-called skip coating is to be avoided, i.e., a coating wher~e spots completely void of coating mixture can occur due to air bubbles. Besides, an always unchanging gap is to prevail at any time in the area of the overflow slat, and the gap width according to the teaching of (1) is to be kept as small as possi-ble, so that at any rate there will be only a very limited 20~934~
overflow at this point, or none at all.
Thus, the problem underlying the invention i~ to ~o design a coater of the above-described type, wherein the entire device will be as compact as possible, i.e., its design will be maximally 5space-eaving. Moreover, the technological requirQments on such a nozzle coater will be extensively met, specifically as regards the equality of the coating mixture application, and that, finally, the coater is maximally ~imple in its structur~.
It is an object of the present invention to provide a novel nozzle type coater which obviates or mitigates at least one of the above-mentioned disadvantages of the prior art.
According to a first aspect of the present invention, there is provided a nozzle type coating device for application of a coating mixture on a running web, said coating device comprising:
an overflow slat situated at an entrance ~ide of the devi~e where the web entQr~ the devicQs a dosing slat situated at an exit side Or the device where the web exits the device, said overflow slat and ~aid dosing slat being arranged to define a nozzle space between ~aid slats and the web, which nozzle space extends across the width of the web:
a distribution pipe for distributing the coating mixture across the web width:
a feed channel for ieeding coating mixture from the di~tribution pipe at 6urplus to the nozzle 8paces a drain channel for removal of surplus coating ~ixture from the nozzle space, wherein the drain channel empties on said entrance side of the coating device;
an overflow chute connected to said drain ch~nnel, said overflow chute being positioned to collect overflow coating mixt~re from the overflow slat and the drain channel at the same time;
a compensation device extending across the entire width of the webr said compensation device comprising a stationary yoke, a sleeve which surrounds the yoke and is ad~ustable toward the web, and ad~ustable pre~ure transfer means; and 2069~4~
a ~low element, said ~low element being po~itioned BO that the coating mixture ~low~ therearound; wherein in side elevation and viewed in the running direction of the web, the distribution pipe, flow element and compensation device are arranged successively According to a second aspect of the present invention, there is provided a nozzle coating device for application of a coating mixture on a running web, wherein a nozzle spa¢e extends across the web width, which space is defined by an overflow d at on the side of the device where thQ web enter~ and by a do~ing slat on the side of the device where the web exits, said device including a distribution pipe for distributing the coating mixture across the web width, a feed channel for feeding coating mixture ~rom the distribution pipe at surplus to the nozzle space, and a drain channel for removal o~ the surplus coat~ng mixture from the nozzle space, the improvement comprising (a) the drain channel empties on the side of the device where the paper web enters;
(~) the drain channel is connected to an overflow chute, said chute being positioned to collect the overflow from the overflow slat and the drain channel at the same time;
(c) a device for flexur- compen~ation extends acros~ the entire web width, said device for flexur compensation comprising a stationary yoke, a sleeve which ~urrounds the yoke and i5 ad~ustable toward the paper web, and ad~ustable pressure transfer element~;
(d) a flow element i~ positioned 80 that the coating ~ixture flows around said flow element; and (e) in side elevation and viewed in the running direction of the web, the distribution pipe, flow element and compensation device are arranged successively 2a 206~3~
Preferably, with the inventive coating device, the drain channel empties on that side of the coater where the paper web enters. The drain channel is connected to an overflow chute which at the same time collects the overflow from the overflow slat.
Preferably, there is included a device for flexure compensation, which extends across the entire web width and comprises a stationary yoke, a sleeve which surrounds the yoke and is adjustable toward the paper web, and adjustable pressure transfer elements. It is also preferred that a flow element is provided around which flows the coating mixture. In side elevatlon and viewed in the running direction of the web, the elements distribution pipe, flow element and compensation device are arranged successively.
The individual elements contained therein are known. But by their arrangement in the pxesent ~nvention the coater becomes a compact assembly which requires minimal space while nonetheless properly performing the ~unctions expected of it.
Preferred embodiments of the present invention will now be described, by way of example only, with reference to the attached figures, wherein:
Fig. 1 shows an embodiment of a nozzle type coater in a 6ectional plane in which the running direction of the paper web is situated, and which at the same time is perpendicular to the 2b 2~69344 paper web.
Figs. 2 and 3 show alternative embodiments of nozzle type coaters according to the present invention.
The nozzle type coater illustrated in Fig. 1 features a nozzle space 3, which in the running direction of the web is defined by an overflow slat 4 on the entrance side and by a dosing slat 5 on the exit side. Coating mixture is supplied to a distribution pipe 6 featuring a number of not illustrated discharge openings communicating with a feed channel 7, so that coating mixture proceeds through the channel 7 to the nozzle space 3 and, thus, to the paper web 1. Located midway in the feed channel are bumps 7.1 which create a microturbulence in the coating mixture. A drain channel 8 establishes a connection with an overflow chute 9. Contained at the end of the drain channel 28 is an adjustable valve 10 for control of the overflow quantity.
A device 11 serves to control the flexure compensation. What matters specifically is the flexure compensation of the dosing slat 5. However, also the flexure of the entire coater may be affected. The flexure device 11 is presently designed according to DE 39 25 517.4 Al. It features a stationary yoke 12, a sleeve 13 surrounding the yoke 12 and pressure transfer elements 14, such as air bellows. Charging the air bellows with compressed air changes the position of the sleeve 13 and, thus, also that of the dosing slat 5, 80 that a flexure compensation is effected. In accordance with the invention, the compensation device 11 may be so fashioned and arranged that a sufficiently large ~inner stroke~
is created for adjusting also the width of the gap between the edge of the dosing slat 5 and the paper web 1. Thus, no further device is required for that purpose. A laser measuring device 15 is provided, which enables the determination of the exact position of the edge of the dosing slat 5. A signal obtained thereby is 206~344 used to control the compensation device 11.
By design, the entire coating device may be separated in such a way that the compensation device acts solely on the dosing slat 5. ~ut the coater may also be so fashioned that the compensation device 11 acts on the entire coater, correctinq selectively its flexure, or the spacing from the paper web 1.
As can be seen, a drain channel 8 extends through the entire coater in essentially diagonal direction, starting from the edge of the dosing ~lat 5, and to the overflow chute 9.
The overflow chute 9 serves at the same time to collect the very large surplus from the channel 8, and also the very small overflow coming from the overflow slat 4. As can be seen, a flow element 16 i8 located between the feed channel 7 and the drain channel 8. This flow element is thus essentially defined by the feed channel 7, nozzle space 3 and drain channel 8.
As is evident further, the entire coater is fashioned as a compact assem~ly which essentially is beam-shaped and which combines all of the functionally important elements. Presently, the following elements are grouped around an imaginary center:
distribution pipe 6, flow element 16, laser measuring device 15, compensation device 11 and overflow chute 9.
Another advantage of this design is constituted in that the coating mixture has at any point a clear direction o~ flow, that no intersections of flow occur and that the coating mixture, except for a very slight partial flow at the overflow slat 4, flows at contact with the paper web only in the running direction of the web. This meets a major prerequisite for a clean, qual~tatively valuable coating application, and at that, irrespective of whether the device is used as a predosing device or as sole coating device.
The coating device illustrated in Fig. 2 also follows the same principles as that according to Fig. 1. As can be seen, the 2~6~344 . .
elements distribution pipe 6, flow element 16 and compensation device 11 are arranged successively in the runninq direction of the web. The feed channel 7 connects the distribution pipe 6 with the nozzle space 3, following a pattern which is essentially perpendicular to the paper web 1. The drain channel 8 with valve 10 empties again on the entrance side of the coater, i.e., where the paper web 1 enters. The coating m~xture rises thus from the distribution pipe upward in the feed channel 7, is imparted a certain desired turbulence by the bumps 7.1, flows then with its ma;or quantity past the drain channel 8, with a smaller partial amount proceeding into the drain channel, proceeds then to the nozzle space 3, where a smaller part remains on the paper web, discharging through the gap between the paper web 1 and the overflow slat 5, whereas the larger part of the coating mixture completely circumflows the flow element 16 as surplus and proceeds to the drain channel 8.
Fig. 3 illustrates a further embodiment where, however, a certain counterflow of the coating mixture occurs against the running direction of the paper web 1.
While this invention has been described as having a preferred design, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general princlples. Further, this appl~cation is intended to cover such departures from the present 100 disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims.
F ~ Q~ IN~-MI-x~ QN A PAPER WEB
The invention concerns a nozzle type coater for application of a coating mixture on a paper web, with a nozzle space extending across the web width and defined on the entrance side of the web by an overflow slat and on the exit side o~ the web by a dosing ~lat. A distribution pipe di6tributes the coating mixture across the web width, and a feed channel feeds coating mixture from the distribution pipe at surplus to the nozzle space. A drain channel removes surplus coating mixture from the nozzle space.
Such a coater is known from P 3 446 757. Its ob~ective is removing the comparatively large surplus quantities from the nozzle space without causing thereby the intake of air in the area of the overflow slat.
A number of similar nozzle applicators have become known. As examples, reference is made to United States patent 3,518,964 United States patent 4,250,211 Voith company publication of October, 1987, page 2766.
Space conditions are generally congested. Therefore, there is a general need to give coaters of the initially named type a design as compact as possible. At the same time, however, certain technological requirements are to be met. For instance, the advantages according to the teaching (1) are to be retained, that is, a so-called skip coating is to be avoided, i.e., a coating wher~e spots completely void of coating mixture can occur due to air bubbles. Besides, an always unchanging gap is to prevail at any time in the area of the overflow slat, and the gap width according to the teaching of (1) is to be kept as small as possi-ble, so that at any rate there will be only a very limited 20~934~
overflow at this point, or none at all.
Thus, the problem underlying the invention i~ to ~o design a coater of the above-described type, wherein the entire device will be as compact as possible, i.e., its design will be maximally 5space-eaving. Moreover, the technological requirQments on such a nozzle coater will be extensively met, specifically as regards the equality of the coating mixture application, and that, finally, the coater is maximally ~imple in its structur~.
It is an object of the present invention to provide a novel nozzle type coater which obviates or mitigates at least one of the above-mentioned disadvantages of the prior art.
According to a first aspect of the present invention, there is provided a nozzle type coating device for application of a coating mixture on a running web, said coating device comprising:
an overflow slat situated at an entrance ~ide of the devi~e where the web entQr~ the devicQs a dosing slat situated at an exit side Or the device where the web exits the device, said overflow slat and ~aid dosing slat being arranged to define a nozzle space between ~aid slats and the web, which nozzle space extends across the width of the web:
a distribution pipe for distributing the coating mixture across the web width:
a feed channel for ieeding coating mixture from the di~tribution pipe at 6urplus to the nozzle 8paces a drain channel for removal of surplus coating ~ixture from the nozzle space, wherein the drain channel empties on said entrance side of the coating device;
an overflow chute connected to said drain ch~nnel, said overflow chute being positioned to collect overflow coating mixt~re from the overflow slat and the drain channel at the same time;
a compensation device extending across the entire width of the webr said compensation device comprising a stationary yoke, a sleeve which surrounds the yoke and is ad~ustable toward the web, and ad~ustable pre~ure transfer means; and 2069~4~
a ~low element, said ~low element being po~itioned BO that the coating mixture ~low~ therearound; wherein in side elevation and viewed in the running direction of the web, the distribution pipe, flow element and compensation device are arranged successively According to a second aspect of the present invention, there is provided a nozzle coating device for application of a coating mixture on a running web, wherein a nozzle spa¢e extends across the web width, which space is defined by an overflow d at on the side of the device where thQ web enter~ and by a do~ing slat on the side of the device where the web exits, said device including a distribution pipe for distributing the coating mixture across the web width, a feed channel for feeding coating mixture ~rom the distribution pipe at surplus to the nozzle space, and a drain channel for removal o~ the surplus coat~ng mixture from the nozzle space, the improvement comprising (a) the drain channel empties on the side of the device where the paper web enters;
(~) the drain channel is connected to an overflow chute, said chute being positioned to collect the overflow from the overflow slat and the drain channel at the same time;
(c) a device for flexur- compen~ation extends acros~ the entire web width, said device for flexur compensation comprising a stationary yoke, a sleeve which ~urrounds the yoke and i5 ad~ustable toward the paper web, and ad~ustable pressure transfer element~;
(d) a flow element i~ positioned 80 that the coating ~ixture flows around said flow element; and (e) in side elevation and viewed in the running direction of the web, the distribution pipe, flow element and compensation device are arranged successively 2a 206~3~
Preferably, with the inventive coating device, the drain channel empties on that side of the coater where the paper web enters. The drain channel is connected to an overflow chute which at the same time collects the overflow from the overflow slat.
Preferably, there is included a device for flexure compensation, which extends across the entire web width and comprises a stationary yoke, a sleeve which surrounds the yoke and is adjustable toward the paper web, and adjustable pressure transfer elements. It is also preferred that a flow element is provided around which flows the coating mixture. In side elevatlon and viewed in the running direction of the web, the elements distribution pipe, flow element and compensation device are arranged successively.
The individual elements contained therein are known. But by their arrangement in the pxesent ~nvention the coater becomes a compact assembly which requires minimal space while nonetheless properly performing the ~unctions expected of it.
Preferred embodiments of the present invention will now be described, by way of example only, with reference to the attached figures, wherein:
Fig. 1 shows an embodiment of a nozzle type coater in a 6ectional plane in which the running direction of the paper web is situated, and which at the same time is perpendicular to the 2b 2~69344 paper web.
Figs. 2 and 3 show alternative embodiments of nozzle type coaters according to the present invention.
The nozzle type coater illustrated in Fig. 1 features a nozzle space 3, which in the running direction of the web is defined by an overflow slat 4 on the entrance side and by a dosing slat 5 on the exit side. Coating mixture is supplied to a distribution pipe 6 featuring a number of not illustrated discharge openings communicating with a feed channel 7, so that coating mixture proceeds through the channel 7 to the nozzle space 3 and, thus, to the paper web 1. Located midway in the feed channel are bumps 7.1 which create a microturbulence in the coating mixture. A drain channel 8 establishes a connection with an overflow chute 9. Contained at the end of the drain channel 28 is an adjustable valve 10 for control of the overflow quantity.
A device 11 serves to control the flexure compensation. What matters specifically is the flexure compensation of the dosing slat 5. However, also the flexure of the entire coater may be affected. The flexure device 11 is presently designed according to DE 39 25 517.4 Al. It features a stationary yoke 12, a sleeve 13 surrounding the yoke 12 and pressure transfer elements 14, such as air bellows. Charging the air bellows with compressed air changes the position of the sleeve 13 and, thus, also that of the dosing slat 5, 80 that a flexure compensation is effected. In accordance with the invention, the compensation device 11 may be so fashioned and arranged that a sufficiently large ~inner stroke~
is created for adjusting also the width of the gap between the edge of the dosing slat 5 and the paper web 1. Thus, no further device is required for that purpose. A laser measuring device 15 is provided, which enables the determination of the exact position of the edge of the dosing slat 5. A signal obtained thereby is 206~344 used to control the compensation device 11.
By design, the entire coating device may be separated in such a way that the compensation device acts solely on the dosing slat 5. ~ut the coater may also be so fashioned that the compensation device 11 acts on the entire coater, correctinq selectively its flexure, or the spacing from the paper web 1.
As can be seen, a drain channel 8 extends through the entire coater in essentially diagonal direction, starting from the edge of the dosing ~lat 5, and to the overflow chute 9.
The overflow chute 9 serves at the same time to collect the very large surplus from the channel 8, and also the very small overflow coming from the overflow slat 4. As can be seen, a flow element 16 i8 located between the feed channel 7 and the drain channel 8. This flow element is thus essentially defined by the feed channel 7, nozzle space 3 and drain channel 8.
As is evident further, the entire coater is fashioned as a compact assem~ly which essentially is beam-shaped and which combines all of the functionally important elements. Presently, the following elements are grouped around an imaginary center:
distribution pipe 6, flow element 16, laser measuring device 15, compensation device 11 and overflow chute 9.
Another advantage of this design is constituted in that the coating mixture has at any point a clear direction o~ flow, that no intersections of flow occur and that the coating mixture, except for a very slight partial flow at the overflow slat 4, flows at contact with the paper web only in the running direction of the web. This meets a major prerequisite for a clean, qual~tatively valuable coating application, and at that, irrespective of whether the device is used as a predosing device or as sole coating device.
The coating device illustrated in Fig. 2 also follows the same principles as that according to Fig. 1. As can be seen, the 2~6~344 . .
elements distribution pipe 6, flow element 16 and compensation device 11 are arranged successively in the runninq direction of the web. The feed channel 7 connects the distribution pipe 6 with the nozzle space 3, following a pattern which is essentially perpendicular to the paper web 1. The drain channel 8 with valve 10 empties again on the entrance side of the coater, i.e., where the paper web 1 enters. The coating m~xture rises thus from the distribution pipe upward in the feed channel 7, is imparted a certain desired turbulence by the bumps 7.1, flows then with its ma;or quantity past the drain channel 8, with a smaller partial amount proceeding into the drain channel, proceeds then to the nozzle space 3, where a smaller part remains on the paper web, discharging through the gap between the paper web 1 and the overflow slat 5, whereas the larger part of the coating mixture completely circumflows the flow element 16 as surplus and proceeds to the drain channel 8.
Fig. 3 illustrates a further embodiment where, however, a certain counterflow of the coating mixture occurs against the running direction of the paper web 1.
While this invention has been described as having a preferred design, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general princlples. Further, this appl~cation is intended to cover such departures from the present 100 disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims.
Claims (8)
1. A nozzle type coating device for application of a coating mixture on a running web, said coating device comprising:
an overflow slat situated at an entrance side of the device where the web enters the device;
a dosing slat situated at an exit side of the device where the web exits the device, said overflow slat and said dosing slat being arranged to define a nozzle space between said slats and the web, which nozzle space extends across the width of the web;
a distribution pipe for distributing the coating mixture across the web width;
a feed channel for feeding coating mixture from the distribution pipe at surplus to the nozzle space;
a drain channel for removal of surplus coating mixture from the nozzle space, wherein the drain channel empties on said entrance side of the coating device;
an overflow chute connected to said drain channel, said overflow chute being positioned to collect overflow coating mixture from the overflow slat and the drain channel at the same time;
a compensation device extending across the entire width of the web, said compensation device comprising a stationary yoke, a sleeve which surrounds the yoke and is adjustable toward the web, and adjustable pressure transfer means; and a flow element, said flow element being positioned so that the coating mixture flows therearound; wherein in side elevation and viewed in the running direction of the web, the distribution pipe, flow element and compensation device are arranged successively.
an overflow slat situated at an entrance side of the device where the web enters the device;
a dosing slat situated at an exit side of the device where the web exits the device, said overflow slat and said dosing slat being arranged to define a nozzle space between said slats and the web, which nozzle space extends across the width of the web;
a distribution pipe for distributing the coating mixture across the web width;
a feed channel for feeding coating mixture from the distribution pipe at surplus to the nozzle space;
a drain channel for removal of surplus coating mixture from the nozzle space, wherein the drain channel empties on said entrance side of the coating device;
an overflow chute connected to said drain channel, said overflow chute being positioned to collect overflow coating mixture from the overflow slat and the drain channel at the same time;
a compensation device extending across the entire width of the web, said compensation device comprising a stationary yoke, a sleeve which surrounds the yoke and is adjustable toward the web, and adjustable pressure transfer means; and a flow element, said flow element being positioned so that the coating mixture flows therearound; wherein in side elevation and viewed in the running direction of the web, the distribution pipe, flow element and compensation device are arranged successively.
2. The coating device of claim 1, wherein said distribution pipe is arranged on the side of the overflow slat remote from the web, and in the immediate vicinity and supporting the over-flow slat.
3. The coating device of claim 1, wherein the distribution pipe, flow element, compensation device and overflow chute are grouped around a common imaginary center in generally circular fashion.
4. The coating device of claim 1, wherein the drain channel traverses the entire coater, viewed in cross section in the running direction of the web and perpendicular to the web, diagonally from the edge of the dosing slat toward the overflow chute.
5. The coating device of claim 1, wherein the sleeve of the compensation device has an infeed stroke of a magnitude such that the width of a gap extending between the edge of the dosing slat and the web can be adjusted solely thereby.
6. The coating device of claim 1, wherein said dosing slat is a roll doctor.
7. The coating device of claim 1, wherein said dosing slat is a profile bar.
8. A nozzle type coating device for application of a coating mixture on a running web, wherein a nozzle space extends across the web width, which space is defined by an overflow slat on the side of the device where the web enters and by a dosing slat on the side of the device where the web exits, said device including a distribution pipe for distributing the coating mixture across the web width, a feed channel for feeding coating mixture from the distribution pipe at surplus to the nozzle space, and a drain channel for removal of the surplus coating mixture from the nozzle space, the improvement comprising:
(a) the drain channel empties on the side of the device where the paper web enters;
(b) the drain channel is connected to an overflow chute, said chute being positioned to collect the overflow from the overflow slat and the drain channel at the same time;
(c) a device for flexure compensation extends across the entire web width, said device for flexure compensation comprising a stationary yoke, a sleeve which surrounds the yoke and is adjustable toward the paper web, and adjustable pressure transfer elements;
(d) a flow element is positioned so that the coating mixture flows around said flow element; and (e) in side elevation and viewed in the running direction of the web, the distribution pipe, flow element and compensation device are arranged successively.
(a) the drain channel empties on the side of the device where the paper web enters;
(b) the drain channel is connected to an overflow chute, said chute being positioned to collect the overflow from the overflow slat and the drain channel at the same time;
(c) a device for flexure compensation extends across the entire web width, said device for flexure compensation comprising a stationary yoke, a sleeve which surrounds the yoke and is adjustable toward the paper web, and adjustable pressure transfer elements;
(d) a flow element is positioned so that the coating mixture flows around said flow element; and (e) in side elevation and viewed in the running direction of the web, the distribution pipe, flow element and compensation device are arranged successively.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4116729A DE4116729C2 (en) | 1991-05-23 | 1991-05-23 | Nozzle-like coating device for applying a coating slip to a running paper web |
| DEP4116729.5 | 1991-05-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2069344A1 true CA2069344A1 (en) | 1992-11-24 |
Family
ID=6432182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002069344A Abandoned CA2069344A1 (en) | 1991-05-23 | 1992-05-25 | Nozzle type coater for application of a coating mixture on a paper web |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0514735B1 (en) |
| JP (1) | JPH05138106A (en) |
| AT (1) | ATE119437T1 (en) |
| BR (1) | BR9201991A (en) |
| CA (1) | CA2069344A1 (en) |
| DE (2) | DE4116729C2 (en) |
| ES (1) | ES2070550T3 (en) |
| FI (1) | FI97406C (en) |
| NO (1) | NO921984L (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI924248A (en) * | 1991-10-10 | 1993-04-11 | Voith Gmbh J M | DELNINGSROER |
| FI105533B (en) * | 1992-10-26 | 2000-09-15 | Valmet Paper Machinery Inc | Spray Coating Apparatus and Method |
| DE4402626C2 (en) * | 1994-01-31 | 1998-03-19 | Voith Gmbh J M | Device for spreading a paper web |
| DE9409820U1 (en) * | 1994-06-17 | 1994-09-01 | Voith Ag J M | Device for applying at least one liquid medium to a running web of material |
| DE4428741C1 (en) * | 1994-08-13 | 1996-02-22 | Glyco Metall Werke | Method and device for producing thin layers of liquids as a coating or film |
| WO1999000548A1 (en) * | 1997-06-30 | 1999-01-07 | Beloit Technologies, Inc. | Method and apparatus for the high speed application of coating to a traveling paper web |
| 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 |
| US6235115B1 (en) | 1998-01-27 | 2001-05-22 | Beloit Technologies, Inc. | Fountain coating applicator and support beam |
| JP3962860B2 (en) * | 2002-02-19 | 2007-08-22 | 富士フイルム株式会社 | Coating device |
| JP3991261B2 (en) * | 2002-02-19 | 2007-10-17 | 富士フイルム株式会社 | Application method |
| JP7402773B2 (en) * | 2020-09-29 | 2023-12-21 | 富士フイルム株式会社 | Coating equipment and inkjet printing equipment |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3518964A (en) * | 1968-05-02 | 1970-07-07 | Bergstrom Paper Co | Coating applicator with surrounding chamber |
| DE2359413C3 (en) * | 1973-11-29 | 1982-02-11 | Jagenberg-Werke AG, 4000 Düsseldorf | Device for coating running material webs made of paper, cardboard, plastic or the like. |
| US4250211A (en) * | 1978-05-31 | 1981-02-10 | Consolidated Papers, Inc. | Paper coating method and apparatus |
| DE8400325U1 (en) * | 1984-01-07 | 1985-07-18 | Jagenberg AG, 4000 Düsseldorf | Device for coating material webs running over a support roller with adjustable application thickness |
| DE3446525A1 (en) * | 1984-01-07 | 1985-08-01 | Jagenberg AG, 4000 Düsseldorf | Apparatus for coating, with a controllable coating thickness, lengths of material running over a support roller |
| DE3446757C2 (en) * | 1984-11-17 | 1995-05-24 | Voith Gmbh J M | Coating device |
| WO1987000091A1 (en) * | 1985-07-05 | 1987-01-15 | Oy Wärtsilä Ab | Short dwell application with big excess paste amount |
| FI81640C (en) * | 1986-11-14 | 1990-11-12 | Valmet Paper Machinery Inc | Short-dwell coating device for coating a web of material with coating mass |
| FI100311B (en) * | 1988-09-23 | 1997-11-14 | Voith Gmbh J M | Smoothing device for a coating machine |
-
1991
- 1991-05-23 DE DE4116729A patent/DE4116729C2/en not_active Expired - Fee Related
-
1992
- 1992-05-12 AT AT92107919T patent/ATE119437T1/en not_active IP Right Cessation
- 1992-05-12 DE DE59201574T patent/DE59201574D1/en not_active Expired - Fee Related
- 1992-05-12 ES ES92107919T patent/ES2070550T3/en not_active Expired - Lifetime
- 1992-05-12 EP EP92107919A patent/EP0514735B1/en not_active Expired - Lifetime
- 1992-05-20 JP JP4127410A patent/JPH05138106A/en active Pending
- 1992-05-20 NO NO92921984A patent/NO921984L/en unknown
- 1992-05-21 BR BR929201991A patent/BR9201991A/en active Search and Examination
- 1992-05-22 FI FI922359A patent/FI97406C/en not_active IP Right Cessation
- 1992-05-25 CA CA002069344A patent/CA2069344A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| EP0514735B1 (en) | 1995-03-08 |
| EP0514735A1 (en) | 1992-11-25 |
| FI97406C (en) | 1996-12-10 |
| DE59201574D1 (en) | 1995-04-13 |
| ATE119437T1 (en) | 1995-03-15 |
| BR9201991A (en) | 1993-01-12 |
| NO921984L (en) | 1992-11-24 |
| ES2070550T3 (en) | 1995-06-01 |
| DE4116729C2 (en) | 1993-11-25 |
| FI922359A0 (en) | 1992-05-22 |
| FI97406B (en) | 1996-08-30 |
| JPH05138106A (en) | 1993-06-01 |
| FI922359A (en) | 1992-11-24 |
| NO921984D0 (en) | 1992-05-20 |
| DE4116729A1 (en) | 1992-11-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 19980525 |