CA1230965A - Air knife coater - Google Patents
Air knife coaterInfo
- Publication number
- CA1230965A CA1230965A CA000465551A CA465551A CA1230965A CA 1230965 A CA1230965 A CA 1230965A CA 000465551 A CA000465551 A CA 000465551A CA 465551 A CA465551 A CA 465551A CA 1230965 A CA1230965 A CA 1230965A
- Authority
- CA
- Canada
- Prior art keywords
- web
- air knife
- coating
- application zone
- running
- 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
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
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
- D21H25/16—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with a blast of vapour or gas, e.g. air knife
-
- 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
- B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
- B05C11/06—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with a blast of gas or vapour
-
- 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
- D21H5/00—Special paper or cardboard not otherwise provided for
- D21H5/0005—Processes or apparatus specially adapted for applying liquids or other fluent materials to finished paper or board, e.g. impregnating, coating
- D21H5/006—Controlling or regulating
- D21H5/0062—Regulating the amount or the distribution, e.g. smoothing, of essentially fluent material already applied to the paper; Recirculating excess coating material applied to paper
- D21H5/007—Regulating the amount or the distribution, e.g. smoothing, of essentially fluent material already applied to the paper; Recirculating excess coating material applied to paper with a blast of gas or vapour, e.g. air knife
Abstract
ABSTRACT
An air knife coater, in which coating substance is applied onto a running web and is subsequently treated by an air knife device. The application zone is short enough in the longitudinal direction of the web, and it is situated so close to the air knife device, that the web when running at normal coating speed leaves the application zone and reaches the air knife device in a time of at the most 5 milliseconds, preferably at the most 3 milliseconds. The web enters into the application zone and reaches the air knife device in a time of at the most 15 milliseconds, preferably at the most 9 milliseconds.
An air knife coater, in which coating substance is applied onto a running web and is subsequently treated by an air knife device. The application zone is short enough in the longitudinal direction of the web, and it is situated so close to the air knife device, that the web when running at normal coating speed leaves the application zone and reaches the air knife device in a time of at the most 5 milliseconds, preferably at the most 3 milliseconds. The web enters into the application zone and reaches the air knife device in a time of at the most 15 milliseconds, preferably at the most 9 milliseconds.
Description
31~36~
AIR KNIFE COATER
The invention relates to an air Icnife coater for coating at least one side of a running paper or cardboard web.
In known air knife coaters, coating substance is first applied onto a running web at a position rather ar away from the air knife device. Due to this, the coating sub-stance on the web has time to undergo changes before it is treated by the air knife~ Thereby, a part of the liquid component of the coating substance usually penetrates into the web and another part of it vaporizes. This increases the viscosity and the dry solids content of the coating substancey which reduces the effectiveness of the air knife.
Due to this~ air knife coaters have previously been used only at relatively slow web speeds, about 300...400 m/min, the dry solids content of the coating substance being relatively small, usually less than 40 %. Furthermore, the use of an air knife frequently causes foaming prob-lems because of-the high moisture content of the coating substance combined with a high level of excess coating substance applied onto the web.
The object of the invention is to create an air knife coater, which operates effectively even at a high web speed and when the dry solids content of the coating substance is high.
v ~LZ3~ 5 la According to the invention there is provided a device for coating at least one side of a running paper or cardboard web, comprising in combination: an air knife device; an application zone disposed prior to said air knife device in the moving direction of the running web for applying coating substance onto the web by means of a coating sub-stance applicator; said application zone being situated so close to said air knife device that said web, when running at normal coating speed, leaves the application zone and reaches the air knife device in a time of at the most 5 milliseconds, preferably at the most 3 milli-seconds; said application zone being so limited in the longitudinal direction of the running web that said web, when running at normal coating speed, enters into the application zone and reaches the air knife device in a time of at the most 15 milliseconds, preferably at the most 9 milliseconds.
~23~6~
In a preferred embodiment o~ the invention, coating substance is applied onto the web over a distance in the longitudinal direction of the web that is substantially equal to the distance between the air knife and the rear end 5 of the coating substance application zone. This usually gives the best coating result. It is also favourable that the cross section o~ the coating substance application duct continuously decreases in a direction towards the web.
Hereby, the coating sub~tance flow accelerates in the applicator, which eliminates places with low flow velocity where impurities could accumulate.
The applicator normally applies an excess amount o~ coating ~ubstance of about 20...50 % onto the web and this excess amount is removed by the air knife. If the desired coating quantity is 10~g/m2, the applicator applies about 12...15 g/m onto the web. However, even if the coating substance feed is so adjusted, that no ~ubstantial excess of coating ~ubstance is provided, the the air knife still has a favourable e~fect on the quality of the coating, even when it does not blow away excess coating substance. This being the case, it is important that the function of the applicator is so adjustable, that the excess amount o~
coating subskance applied may approach zero.
The running web passes the coating substance applicator, whereby coating substance is spread orto the web. That side of the applicator, from which the web is entering the 3~g~i~
application zone, is called the ~ront side of the applicator, and the side, from which the web leaves the applicator, is called its back side. In a preferred embodiment of the invention, there is an adjustable slot or gap at the back side of the appIicator, between the applicator and the web. By varying the height of this slot the quantity of coating ~ubstance spread onto the web i5 adjusted. In a coater according to the invention also other kinds of applicators may be used, for example, applicators ~here a flexible coating blade or a coating bar is urged against the web at the back edge of tha application zone.
Different kind~ of extrusion applicator~ may also be used.
It has proved to be ~avourable to arrange a coating substance overflow slot or gap at the front edge of the applicator. This gives the advantage, that impurities accumulated in the applicator may depart through the overflow slot~ To use an overflow applicator o~ this kind in a web coating process is known per se.
A coater according to the invention operates in the best manner, i~ the web is supported on the side which is to be left uncoated by a support drum at the position of the coating substance applicator and the air knife. It is also fea~ible that no support is used and instead a device according to the invention is used at both sides of the web for double sided coating of the web. Thereby, the coating substance applicators and the air knives are preferably arranged symmetrically at opposite sides of the web. If a lZ3~
support drum is used, its most favourable diameter is uYually at least 400 mm and at most 1300 mm. The most ~avourable web speed is higher than 400 m/min, preferably about 600 m/min. However, the invention gives favourable results also at considerably smaller web speeds.
The invention will now be described, by way of example, with reference to the accompanying drawing, in which the single Figure is a sectional view o~ an embodiment of a coater according to the invention.
In the drawing, numeral 1 indicates a running paper or cardboard web~ The web 1 is supported by a rotating support drum 2, the diameter of which may be, for example9 0.5 meter. Coating substance is spread onto the web by means of an applicator 3, into which coating substance is pumped through a conduit 4, which at the same time acts as a tilting shaft for the applicator 3. The tilting motion of the applicatGr is accomplished by means o~ one or several power cylinders 5. The accurate operating position of the applicator is determined by means of an adjustable support 6. The power cylinder 5 presses the applicator 3 against the support 6. The applicator has a feed duct continuously narrowing in a direction towards the web 1 in order to obtain a continuously accelerating coating substance flow.
At the back edge of the applicator there is a blade 7, which i i~ not in contact with the web 1 , but leavs a small gap 8 ~3~9~i5i between itself and the web 1. Coating substance 9 fed from the applicator is taken up by the web and moves along with the web to the position of the nozzle of an air knife device 10, where an excess of coating substance is blown away from the web. The distance a between the back edge of the applicator 3 and the nozzle of the air knife device 10 i3 SO
smallg that the web 1 normally moves this distance i~ less than 5 milliseconds, preferably less than 3 milliseconds.
Further, the distance between the front and back edge of the applicator is so small, that the time of the entire coating process, that is, the time it takes for a point on the web to move from the ~ront edge 12 of the appliator to the air knife 10, is shorter than 15 milliseconds, preferably shorter than 9 milliseconds. At high web speeds, the web may move the di3tance a in 0,3 milliseconds and the time of the entire caoting process may corr~spondingly be 0,6...0,9 milliseconds. The viscosity of the coating substance is reduced due to the strong shearing stress caused on the coating substance layer by the blade 7 or by any other corresponding element. This condition of the coating layer ~ill not change substantially before the coating layer is subject to the influence of the air knife 10, which improves the e~ficiency of the air knife function.
At the front edge of the applicator 3, there is an adjustable edge member 11, which is located at a considerable distance from the web 1, thereby forming a rather wide gap 12 between it3elf and the web. Through this ~:~31~965 gap coating substance is continuously flowing ~rom the applicator. This overflow is adjusted to a relatively low level by keeping the pressure in the applicator low. The coating substance flowing out through the gap 12 is collected in a collecting tank 13, ~rom which it is sucked back into the coating substance flow system through an outlet tube 14. The walls of the collecting tank 13 are double, and cooling water is lead to the space between them.
Due to the water cooling, the inner surface of the tank 13 remainY cold and water condenses thereon, so that coating substance does not so easily stick to the surface. Inside the collecting tank 13, the pressure is kept at a level sllghtly below atmospheric pressure by means of the suction ` in the outlet tube 14. This reduces spreading o~ coating substance drops to the environment. At the outer side o~ the blade 7 there is a water cooled cover 15, which diminishes soiling of the blade 7 with coating substance in the same manner as the water cooling of the walls of the tank 13 keeps them clean.
The quantity of coating substance that the applicator applies onto the web 1 is under normal conditions greater than the desired final coating quantity. The excess amount is usually about 20.~.50 %, but it is also possible to perform the coating substance application so, that no ~ubstantial excess of coating substance is provided. This is carried Ollt by pressing the coating blade 7 against the web 1 with a suitable force.
~23~65;
The invention is not limited to the embodiment ~hown, but several modi~ications therof are feasible within the scope of the attached claims.
,..:
AIR KNIFE COATER
The invention relates to an air Icnife coater for coating at least one side of a running paper or cardboard web.
In known air knife coaters, coating substance is first applied onto a running web at a position rather ar away from the air knife device. Due to this, the coating sub-stance on the web has time to undergo changes before it is treated by the air knife~ Thereby, a part of the liquid component of the coating substance usually penetrates into the web and another part of it vaporizes. This increases the viscosity and the dry solids content of the coating substancey which reduces the effectiveness of the air knife.
Due to this~ air knife coaters have previously been used only at relatively slow web speeds, about 300...400 m/min, the dry solids content of the coating substance being relatively small, usually less than 40 %. Furthermore, the use of an air knife frequently causes foaming prob-lems because of-the high moisture content of the coating substance combined with a high level of excess coating substance applied onto the web.
The object of the invention is to create an air knife coater, which operates effectively even at a high web speed and when the dry solids content of the coating substance is high.
v ~LZ3~ 5 la According to the invention there is provided a device for coating at least one side of a running paper or cardboard web, comprising in combination: an air knife device; an application zone disposed prior to said air knife device in the moving direction of the running web for applying coating substance onto the web by means of a coating sub-stance applicator; said application zone being situated so close to said air knife device that said web, when running at normal coating speed, leaves the application zone and reaches the air knife device in a time of at the most 5 milliseconds, preferably at the most 3 milli-seconds; said application zone being so limited in the longitudinal direction of the running web that said web, when running at normal coating speed, enters into the application zone and reaches the air knife device in a time of at the most 15 milliseconds, preferably at the most 9 milliseconds.
~23~6~
In a preferred embodiment o~ the invention, coating substance is applied onto the web over a distance in the longitudinal direction of the web that is substantially equal to the distance between the air knife and the rear end 5 of the coating substance application zone. This usually gives the best coating result. It is also favourable that the cross section o~ the coating substance application duct continuously decreases in a direction towards the web.
Hereby, the coating sub~tance flow accelerates in the applicator, which eliminates places with low flow velocity where impurities could accumulate.
The applicator normally applies an excess amount o~ coating ~ubstance of about 20...50 % onto the web and this excess amount is removed by the air knife. If the desired coating quantity is 10~g/m2, the applicator applies about 12...15 g/m onto the web. However, even if the coating substance feed is so adjusted, that no ~ubstantial excess of coating ~ubstance is provided, the the air knife still has a favourable e~fect on the quality of the coating, even when it does not blow away excess coating substance. This being the case, it is important that the function of the applicator is so adjustable, that the excess amount o~
coating subskance applied may approach zero.
The running web passes the coating substance applicator, whereby coating substance is spread orto the web. That side of the applicator, from which the web is entering the 3~g~i~
application zone, is called the ~ront side of the applicator, and the side, from which the web leaves the applicator, is called its back side. In a preferred embodiment of the invention, there is an adjustable slot or gap at the back side of the appIicator, between the applicator and the web. By varying the height of this slot the quantity of coating ~ubstance spread onto the web i5 adjusted. In a coater according to the invention also other kinds of applicators may be used, for example, applicators ~here a flexible coating blade or a coating bar is urged against the web at the back edge of tha application zone.
Different kind~ of extrusion applicator~ may also be used.
It has proved to be ~avourable to arrange a coating substance overflow slot or gap at the front edge of the applicator. This gives the advantage, that impurities accumulated in the applicator may depart through the overflow slot~ To use an overflow applicator o~ this kind in a web coating process is known per se.
A coater according to the invention operates in the best manner, i~ the web is supported on the side which is to be left uncoated by a support drum at the position of the coating substance applicator and the air knife. It is also fea~ible that no support is used and instead a device according to the invention is used at both sides of the web for double sided coating of the web. Thereby, the coating substance applicators and the air knives are preferably arranged symmetrically at opposite sides of the web. If a lZ3~
support drum is used, its most favourable diameter is uYually at least 400 mm and at most 1300 mm. The most ~avourable web speed is higher than 400 m/min, preferably about 600 m/min. However, the invention gives favourable results also at considerably smaller web speeds.
The invention will now be described, by way of example, with reference to the accompanying drawing, in which the single Figure is a sectional view o~ an embodiment of a coater according to the invention.
In the drawing, numeral 1 indicates a running paper or cardboard web~ The web 1 is supported by a rotating support drum 2, the diameter of which may be, for example9 0.5 meter. Coating substance is spread onto the web by means of an applicator 3, into which coating substance is pumped through a conduit 4, which at the same time acts as a tilting shaft for the applicator 3. The tilting motion of the applicatGr is accomplished by means o~ one or several power cylinders 5. The accurate operating position of the applicator is determined by means of an adjustable support 6. The power cylinder 5 presses the applicator 3 against the support 6. The applicator has a feed duct continuously narrowing in a direction towards the web 1 in order to obtain a continuously accelerating coating substance flow.
At the back edge of the applicator there is a blade 7, which i i~ not in contact with the web 1 , but leavs a small gap 8 ~3~9~i5i between itself and the web 1. Coating substance 9 fed from the applicator is taken up by the web and moves along with the web to the position of the nozzle of an air knife device 10, where an excess of coating substance is blown away from the web. The distance a between the back edge of the applicator 3 and the nozzle of the air knife device 10 i3 SO
smallg that the web 1 normally moves this distance i~ less than 5 milliseconds, preferably less than 3 milliseconds.
Further, the distance between the front and back edge of the applicator is so small, that the time of the entire coating process, that is, the time it takes for a point on the web to move from the ~ront edge 12 of the appliator to the air knife 10, is shorter than 15 milliseconds, preferably shorter than 9 milliseconds. At high web speeds, the web may move the di3tance a in 0,3 milliseconds and the time of the entire caoting process may corr~spondingly be 0,6...0,9 milliseconds. The viscosity of the coating substance is reduced due to the strong shearing stress caused on the coating substance layer by the blade 7 or by any other corresponding element. This condition of the coating layer ~ill not change substantially before the coating layer is subject to the influence of the air knife 10, which improves the e~ficiency of the air knife function.
At the front edge of the applicator 3, there is an adjustable edge member 11, which is located at a considerable distance from the web 1, thereby forming a rather wide gap 12 between it3elf and the web. Through this ~:~31~965 gap coating substance is continuously flowing ~rom the applicator. This overflow is adjusted to a relatively low level by keeping the pressure in the applicator low. The coating substance flowing out through the gap 12 is collected in a collecting tank 13, ~rom which it is sucked back into the coating substance flow system through an outlet tube 14. The walls of the collecting tank 13 are double, and cooling water is lead to the space between them.
Due to the water cooling, the inner surface of the tank 13 remainY cold and water condenses thereon, so that coating substance does not so easily stick to the surface. Inside the collecting tank 13, the pressure is kept at a level sllghtly below atmospheric pressure by means of the suction ` in the outlet tube 14. This reduces spreading o~ coating substance drops to the environment. At the outer side o~ the blade 7 there is a water cooled cover 15, which diminishes soiling of the blade 7 with coating substance in the same manner as the water cooling of the walls of the tank 13 keeps them clean.
The quantity of coating substance that the applicator applies onto the web 1 is under normal conditions greater than the desired final coating quantity. The excess amount is usually about 20.~.50 %, but it is also possible to perform the coating substance application so, that no ~ubstantial excess of coating substance is provided. This is carried Ollt by pressing the coating blade 7 against the web 1 with a suitable force.
~23~65;
The invention is not limited to the embodiment ~hown, but several modi~ications therof are feasible within the scope of the attached claims.
,..:
Claims (11)
1. A device for coating at least one side of a running paper or cardboard web, comprising in combination:
an air knife device;
an application zone disposed prior to said air knife device in the moving direction of the running web for applying coating substance onto the web by means of a coating substance applicator;
said application zone being situated so close to said air knife device that said web, when running at nor-mal coating speed, leaves the application zone and reaches the air knife device in a time of at the most 5 milliseconds;
said application zone being so limited in the lon-gitudinal direction of the running web that said web, when running at normal coating speed, enters into the application zone and reaches the air knife device in a time of at the most 15 milliseconds.
an air knife device;
an application zone disposed prior to said air knife device in the moving direction of the running web for applying coating substance onto the web by means of a coating substance applicator;
said application zone being situated so close to said air knife device that said web, when running at nor-mal coating speed, leaves the application zone and reaches the air knife device in a time of at the most 5 milliseconds;
said application zone being so limited in the lon-gitudinal direction of the running web that said web, when running at normal coating speed, enters into the application zone and reaches the air knife device in a time of at the most 15 milliseconds.
2. A device according to claim 1, in which the applica-tion zone extends in the longitudinal direction of the web about the same distance as it extends from the back end of the application zone to the air knife device.
3. A device according to claim 1 or 2, said coating sub-stance applicator having a coating substance feed duct continuously narrowing in a direction towards the web.
4. A device according to claim 1, said applicator being arranged to normally apply onto the web an excess amount of coating substance of about 20...50 %, which excess amount is removed by the air knife device.
5. A device according to claim 4, including means for reduc-ing said excess amount of coating substance to a value close to zero.
6. A device according to claim 1 or 2, comprising a gap at the back edge of said applicating zone between the applicator and the web and means for adjusting said gap thereby influenc-ing the quantity of coating substance applied onto the web.
7. A device according to claim 1 or 2, including, at the position where the web enters said application zone, an overflow gap between the applicator and the web.
8. A device according to claim 1 or 2, for two-sided coating of a running web, said device comprising two of said coating substance applicators and air knife devices symmetrically arranged at opposite sides of the web.
9. A device according to claim 1 or 2, the web being supported by a support drum within the application zone as well as at the position of the air knife device.
10. A device according to claim 1 or 2, the moving speed of the web being greater than 400 m/min, preferably about 600 m/min.
11. A device according to claim 1, wherein said applica-tion zone being situated so close to said air knife device that said web, when running at normal coating speed, leaves the application zone and reaches the air knife device in a time of at the most 3 milliseconds; and said application zone being so limited in the longitudinal direction of the running web that said web, when running at normal coating speed, enters into the application zone and reaches the air knife device in a time of at the most 9 milliseconds.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI833765A FI68536C (en) | 1983-10-17 | 1983-10-17 | LUFTKNIVSBESTRYKARE |
| FI833765 | 1983-10-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1230965A true CA1230965A (en) | 1988-01-05 |
Family
ID=8517923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000465551A Expired CA1230965A (en) | 1983-10-17 | 1984-10-16 | Air knife coater |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS60102973A (en) |
| CA (1) | CA1230965A (en) |
| DE (1) | DE3438041C2 (en) |
| FI (1) | FI68536C (en) |
| FR (1) | FR2553305B1 (en) |
| IT (1) | IT1176969B (en) |
| NO (1) | NO844132L (en) |
| SE (1) | SE8405099L (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5741550A (en) * | 1993-10-27 | 1998-04-21 | Valmet Corporation | Blade metering unit and method for blade-coating a material web |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3526178C1 (en) * | 1985-07-23 | 1986-08-14 | Langguth GmbH & Co, 4400 Münster | Gluing process for containers in labeling machines using e.g. of hot melt adhesives |
| DE3745173C2 (en) * | 1986-07-25 | 2000-03-02 | Valmet Corp | Short burst paper coating |
| DE3735889C2 (en) * | 1986-10-25 | 1994-02-03 | Voith Gmbh J M | Coating device |
| JPH0392799U (en) * | 1990-01-11 | 1991-09-20 | ||
| EP0477965A3 (en) * | 1990-09-28 | 1992-05-27 | National Starch And Chemical Investment Holding Corporation | Hot-melt applicator |
| DE19643742A1 (en) * | 1996-10-23 | 1998-04-30 | Vits Maschinenbau Gmbh | Method and device for coating a paper web |
| DE10245074A1 (en) * | 2002-09-27 | 2004-04-01 | Voith Paper Patent Gmbh | Doctor unit wipes off or equalises coating dye applied on running paper or board and features counter pressure unit, which exerts pressure on doctor element at height of pressure gap |
| JPWO2007032060A1 (en) * | 2005-09-13 | 2009-03-19 | サンスター技研株式会社 | High viscosity material applicator |
| DE102012001328A1 (en) * | 2012-01-25 | 2013-07-25 | Olbrich Gmbh | Coating device for flexible webs, has air knife on one side of transport path opposite to application roller and is arranged, such that air flows out of air knife, where flexible web is pressed in direction of application roller |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE255662C (en) * | ||||
| FR1300729A (en) * | 1960-11-04 | 1962-08-10 | Du Pont | A method and apparatus comprising an air knife for coating a web of material with a layer of liquid |
| DE1577722A1 (en) * | 1963-12-06 | 1970-01-29 | Agfa Gevaert Ag | Method and device for coating running films, tapes or the like. With viscous solutions |
| US3676178A (en) * | 1969-04-25 | 1972-07-11 | Agfa Gevaert Ag | Process and apparatus for coating web supports |
-
1983
- 1983-10-17 FI FI833765A patent/FI68536C/en not_active IP Right Cessation
-
1984
- 1984-10-11 SE SE8405099A patent/SE8405099L/en not_active Application Discontinuation
- 1984-10-15 FR FR8415762A patent/FR2553305B1/en not_active Expired
- 1984-10-16 IT IT23156/84A patent/IT1176969B/en active
- 1984-10-16 JP JP59215320A patent/JPS60102973A/en active Granted
- 1984-10-16 NO NO844132A patent/NO844132L/en unknown
- 1984-10-16 CA CA000465551A patent/CA1230965A/en not_active Expired
- 1984-10-17 DE DE3438041A patent/DE3438041C2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5741550A (en) * | 1993-10-27 | 1998-04-21 | Valmet Corporation | Blade metering unit and method for blade-coating a material web |
| US5919524A (en) * | 1993-10-27 | 1999-07-06 | Valmet Corporation | Blade metering unit and method for blade-coating a material web |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2553305B1 (en) | 1987-08-14 |
| NO844132L (en) | 1985-04-18 |
| JPS60102973A (en) | 1985-06-07 |
| DE3438041C2 (en) | 1995-11-23 |
| SE8405099D0 (en) | 1984-10-11 |
| FI833765A0 (en) | 1983-10-17 |
| FR2553305A1 (en) | 1985-04-19 |
| IT1176969B (en) | 1987-08-26 |
| FI68536C (en) | 1985-10-10 |
| FI833765A (en) | 1985-04-18 |
| FI68536B (en) | 1985-06-28 |
| DE3438041A1 (en) | 1985-04-25 |
| SE8405099L (en) | 1985-04-18 |
| IT8423156A0 (en) | 1984-10-16 |
| JPH0378146B2 (en) | 1991-12-12 |
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