CA2102287A1 - Pressure strip for coating device - Google Patents
Pressure strip for coating deviceInfo
- Publication number
- CA2102287A1 CA2102287A1 CA002102287A CA2102287A CA2102287A1 CA 2102287 A1 CA2102287 A1 CA 2102287A1 CA 002102287 A CA002102287 A CA 002102287A CA 2102287 A CA2102287 A CA 2102287A CA 2102287 A1 CA2102287 A1 CA 2102287A1
- Authority
- CA
- Canada
- Prior art keywords
- doctor blade
- pressure strip
- web
- counter
- roller
- 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
-
- 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
- B05C11/04—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 blades
- B05C11/041—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 blades characterised by means for positioning, loading, or deforming the blades
- B05C11/042—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 blades characterised by means for positioning, loading, or deforming the blades allowing local positioning, loading or deforming along the blades
-
- 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
- D21H25/10—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with blades
Landscapes
- Coating Apparatus (AREA)
- Paper (AREA)
- Executing Machine-Instructions (AREA)
Abstract
(57) Abstract In coating devices for paper or cardboard webs (2) having a doctor blade (3) as dosing element, flexible pressure strips (5) that rest on the doctor blade (3) are used to allow the contact pressure of the doctor blade (3) to be regulated. The pressure strip (5) has a surface moment of inertia (1x) measured in the perpendicular direction to the flexure plane comprised be-tween 100 mm4 and 5000 mm4, preferably between 800 mm4 and 1200 mm4. A locally differentiated contact pressure can thus be regulated without causing coating irregularities at high speeds of the web. The adjusting elements for the pres-sure strip (5) have an axially movable adjusting rod (8) push a pres-by a holder (7). The ends of the adjusting rod (8) push a pres-tressed pressure spring (12). An adjustable screw (16) coaxial-ly arranged with respect to the adjusting rod (8) presses against the force of the spring (12) in the direction of the web
Description
21022~
WO 93/17795 PCT~EP93/00031 DESCRIPTION
A PRESSURE STRIP FOR A COATING DEVICE
Technical Domain : ' ' ' ' The present invention relates to a pressure strip for a doctor blade in a device used for coating moving webs of material, in particular webs of paper or cardboard, as defined in the preamble to patent claim l, and a device for coating a moving web of ;;~
material, as defined in the preamble to patent claim 3.
Prior Art Devices that are used to coat webs of paper or cardboard are - -already known; these incorporate an applicator (roller or nozzle applicator), with which an excess o~ coating material, e.g., brush-on colour, is applied to the web. A metering system that is arranged ad~acent to the applicator, which has a doctor blade as the dosing element, removes the excess down to the desired coating thickness, the level of the coating thickness being adjustable by way of the contact pressure of the doctor blade against the counter-roller. Beneath its tip, the doctor blade is ~ ~`
supported by an adjacent pressure strip whereby the contact - ~`
pressure can be varied by moving and/or rotating the foot of the ` -~
doctor blade, which is clamped in position. ~;
Variations in the cross-sectional profile of the web, which originate when the webs are being manufactured, occur when paper or caxdboard webs are being coated, and these irregularities make it necessary to ad~ust the contact pressure of the doctor blade differently across the working width in order to achieve an even ~-~-,.. ~...
:. .` ~ " ' '-r~ ~ 2 8 7 Wo 93~17795 PCT/EP93/00031 coating. To this end, it is known from DE-PS 28 25 907 that a flexible supporting strip can be adjusted within limits by way of pressure and tension screws along the line of pressure, depending on whether the weight o~ coating that is applied at the corresponding point is either too high or too low.
DE-OS 39 27 329 describes a coating apparatus of this kind in which pietzo translators are used as the adjusting elements for the supporting strip. According to one embodiment, springs work against the contact pressure of the supporting strip achieved with the pietzo translators, whereby the counter-force of the springs can be adjusted.
In practice, it has been shown that deliberately bending the doctor blade across the working width in order to set an even coating profile is extremely difficult at high web speeds.
Forces that press away ~rom the counter-roller act from the web with the excess quantity of coating material on the doctor blade, which has to be supported without the thickness of the coating becoming uneven.
Description of the Invention -~ -It is the task of the present invention to create a supporting strip of this kind, which permits a locally differentiated adjustment of the contact pressure of the doctor blade without irregularities in the evenness of the coating occurring at high web speeds because of the forces acting on the doctor blade.
This problem has baan solved with the features set out in patent I claim 1. On the one hand, the supporting strip is so flexible that delicate adjustment of the contact pressure is possible, on
WO 93/17795 PCT~EP93/00031 DESCRIPTION
A PRESSURE STRIP FOR A COATING DEVICE
Technical Domain : ' ' ' ' The present invention relates to a pressure strip for a doctor blade in a device used for coating moving webs of material, in particular webs of paper or cardboard, as defined in the preamble to patent claim l, and a device for coating a moving web of ;;~
material, as defined in the preamble to patent claim 3.
Prior Art Devices that are used to coat webs of paper or cardboard are - -already known; these incorporate an applicator (roller or nozzle applicator), with which an excess o~ coating material, e.g., brush-on colour, is applied to the web. A metering system that is arranged ad~acent to the applicator, which has a doctor blade as the dosing element, removes the excess down to the desired coating thickness, the level of the coating thickness being adjustable by way of the contact pressure of the doctor blade against the counter-roller. Beneath its tip, the doctor blade is ~ ~`
supported by an adjacent pressure strip whereby the contact - ~`
pressure can be varied by moving and/or rotating the foot of the ` -~
doctor blade, which is clamped in position. ~;
Variations in the cross-sectional profile of the web, which originate when the webs are being manufactured, occur when paper or caxdboard webs are being coated, and these irregularities make it necessary to ad~ust the contact pressure of the doctor blade differently across the working width in order to achieve an even ~-~-,.. ~...
:. .` ~ " ' '-r~ ~ 2 8 7 Wo 93~17795 PCT/EP93/00031 coating. To this end, it is known from DE-PS 28 25 907 that a flexible supporting strip can be adjusted within limits by way of pressure and tension screws along the line of pressure, depending on whether the weight o~ coating that is applied at the corresponding point is either too high or too low.
DE-OS 39 27 329 describes a coating apparatus of this kind in which pietzo translators are used as the adjusting elements for the supporting strip. According to one embodiment, springs work against the contact pressure of the supporting strip achieved with the pietzo translators, whereby the counter-force of the springs can be adjusted.
In practice, it has been shown that deliberately bending the doctor blade across the working width in order to set an even coating profile is extremely difficult at high web speeds.
Forces that press away ~rom the counter-roller act from the web with the excess quantity of coating material on the doctor blade, which has to be supported without the thickness of the coating becoming uneven.
Description of the Invention -~ -It is the task of the present invention to create a supporting strip of this kind, which permits a locally differentiated adjustment of the contact pressure of the doctor blade without irregularities in the evenness of the coating occurring at high web speeds because of the forces acting on the doctor blade.
This problem has baan solved with the features set out in patent I claim 1. On the one hand, the supporting strip is so flexible that delicate adjustment of the contact pressure is possible, on
2~ 0~
, ~ .
WO 93/17795 PC~/EP93/00031 the other hand, it is stiff enough to accommodate the forces acting on the doctor blade without interfering with the thickness of the coating.
A further task of the present inven'ion is to create a coating device of this kind in which the contact pressure of the doctor blade can be set across the working width so as to be locally differentiated and extremely precise, it being possible to do this by a simple design.
Thls task has been solved by the faatures set out in patent claims 3 or 4, respectively.
In the apparatus according to claim 3, the spacing of the -~
individual adjusting points is so selected that the flexibility of the pressure strip is within a range that ensures both ¦ delicate adjustment of the contact pressure and ade~uate stability.
Patent claim 4 describes a particularly advantageous ~-configuration of the adjusting elements, with which the pressure ~ -strip can be bent to varying degrees at different points. The -adjusting elements permit adjustment of the pressure strip without any play, and without major construction costs.
j The particularly advantageous configuration described in claim 5 ` -~
permits both coarse and fine adjustment, the latter being effected by means of the differential screw principle. A further advantage is the fact that during coarse adjustment without the differential effect, it is possible to set a reference position that can be rPplicated and from which fine positioning is carried out when the differential effect is in effect.
- 21D22~7 Brief Description of the Drawinqs The drawings serve to explain the present invention on the basis of an embodiment that is shown there-Ln in simplified form. These drawings show the following:
igure 1: a longitudinal section through a pressure strip with the adjusting elements according to the present invention;
igure 2: a partially cross-sectioned perspective view.
A Way to Realize the Present Invention ~he coating device incorporates a driven counter-roller 1 by which the web 2 of material--a paper or cardboard web 8 m or more wide--is deflected. An excess of coating materia~ is applied to the web l of material by an applicator system ~not shown herein), ~nd this exce~ raked o~f ~removed) to the desired thickness by a metering system with an elastically flexible doctor blade 3 as the metering element. The foot of the doctor blade 3 is clamped in a clamping beam 4 that can be moved towards the counter-roller 1 and is supported on its side that is remote from the counter-roller 1, beneath the tip of the doctor blade, by a pressure strip 5 that is elastically flexible within limits, in the direction of the counter-roller. The contact pressure of the doctor blade 3 on the counter-roller 1 can be adjusted by a relative movement of the clamping beam 4 to the pressure strip 5 that extends across the whole width of the web.
The pressure strip 5 is of the same cross-section across its whole width--which corresponds to the maximum web width and thus ~228~
, WO 93~17795 PCT/E;P93/001~31 to the axial length of the counter-roller l. Its tip, which lies on the doctor blade 3 is either point:ed or rounded with a radius between 1 mm and 3 mm, in this example 2 mm. On the side that is remote from the doctor blade 3, the cross-section of the pressure strip 5 is rectangular and is matched to a groove 6 in its holder `- ~-7, which is open towards the doctor blade 3, in which the pressure strip 5 is supported so that it can move radially towards the counter-roller l. The height of the pressure strip 5, measured tangentially to the counter-roller 1, is approximately 20 mm and the width of its section that is of -~
rectangular cross-section, measured radially, is approximately 10 mm. It is preferred that it be of chromium-nickel steel;
alternatively, it can be manuEactured from carbon fibre reinforced plastic, for example, and/or be coated so as to be wear-resistant. Guiding it in the groove 6 of the holder 7 makes it possible to bend the pressure strip 5 in a bending plane that extends approximately radially to the counter-roller 1. In order to permit ~he finest possible adjustment of the line of contact on the doctor blade 3 without any disruptive rearward acting forces, the surface moment of inertia Ix of the pressure strip 5, measured perpendicular to the bending plane, is between 100 mm4 and 5,0004, preferably between 800 mm4 and 1,200 mm4; in the present example, is 1,000 mm4.
~n order that the pressure strip 5 can be bent transversely across the worXing width in order to set a desired cross-section profile of the thickness of the coating by a locally differentiated contact pressure of the doctor blade 3, there are drillings across the whole working width in its back, these being regularly spaced--the example every 75 mm--in each of which the end of an adjusting rod 8 is securely screwed. The adjusting rods 8 are guided so as to be able to move freely in an axial . :' i';~
2:1~2287 . . .
WO 93/17795 PCT~EP93/00031 direction in the drillings in the base plate 9 of the holder 7 that, at its end that is proximate to the doctor blade 3, has a rectangular notch that is covered over at the top by a cover plate 10 that is screwed to the base plate 9 to form the groove 6.
A sleeve 11 is drawn over the end of each adjusting rod 8 that ¦ extends out of the drilling in the base plate 3; a bead-like Z wider section of this rests against the base plate 9. At least l one disk spring 12 is installed over the sleeve 11, this rests at i one end against the bead, and at the other end against an I adjusting nut 13 that is screwed onto the end of the adjusting I rod 8. The adjusting nut 13 incorporates a drilling that is matched to the diameter of the sleeve 11 in order that it can move over the sleeve 11 so that it can adjust the tension of the spring 12 when it is rotated. The disk spring 12 presses the adjusting rod 8 away from the counter-roller 1 and thereby pulls on the pressure strip 5 in order to reduce the contact pressure on th~ doctor blade 3.
In order to adjust the rod 8 towards and away from the counter-roller 1 there is an adjusting screw 14 that has an inside drilling with a thread and an additional outside thread by which it is screwed into a thread of a holder 15 that is secured to the base plate 9. A further screw 16 is fitted into the continuous inside thread, coaxially to the adjusting rod 8 and this can be moved against the end of the adjusting rod 8 in a direction towa~ds the counter-roller 1 when it is rotated. At the end of the screw 16 there is a washer 17 that is of polygonal cross-section--in the example shown this is a hexaqon--and this presses against the end of the adjusting rod 8 throuqh a ball cap that is secured to it, in order to keep the friction as small as possible -. ..
,. ..
21~22~7 Wo 93/17795 PCT/~P93/00031 :
when the screw 16 is rotated. A cover 18 that can be securely screwed to the upper side of the holder 15 extends from this across the washer 17, the adjusting nut 13, and the disk spriny 12, as far as the cover plate 10 in order to seal up the ad~usting elements at the upper side. At the same time, its lower side is matched to the edges of the washer 17 so as to be in the same plane, and at its periphery 4 forms a positive fit in order to prevent any co-rotation of the washer 17 and thus of the screw 16 when the adjusting screw 14 is rotated. As can be seen in figure 2, each adjusting element has its own removahle cover 18 in order to permit co-rotation of the screw 16 for coarse adjustment by removal of a cover 18; this will be described in greater detail below. In order to permit the finest possible adjustment according to the differential screw principle, the outer thread of the adjusting screw 14 is of a smaller pitch than its inner thread, which corresponds to the outer thread of the screw 16. The screw 16 is somewhat longer than the adjusting screw 14 in which it is supported. Its outer face surface can thus be llned up wlth the outer ~ace surface of the ad~ustlng screw 14 to define a reference point.
The adjustment of a pre-selected curvature of the pressure strip 5 in order to even out the profile of the coating is effected as foilows:
First, with the cover 18 removed, the adjusting screws on the adjusting rods 18 are rotated into an axial position in which the disk springs 12 are at the desired tension. In the base position, the outer face surfaces of the screws are aligned with the outer face surfaces of the adjusting screws 14. Coarse adjustment is now made in that, with the cover 18 removed, each of the adjusting screws 14 is rotated until a reference position -- 21~22~7 Wo 93J17795 PCT/~P93/00031 is reached. When this is done, the hall caps of the washers 17 press the adjusting rods 8 in the direction of the counter-roller 1, against the force of the disk springs 12. The screw 16 rotates with the adjusting screw 14 for the friction at the ball cap of the washer 17 is negligible relative to the friction in the common thread o~ the adjusting screw 14. When the desired reference position is reached, from which the fine adjustm~nt can be made, the covers 18 are re-installed and secured and thus prevent any co-rotation of the screws 16. When an adjusting screw 14 is rotated further, the associated screw 16 changes its axial position relative to the adjusting screw 14 as a function of the pitch of the common thread. The washer 27 only moves towards the adjusting rod or away from it by the difference of the thread pitch, outwards and inwards on the adjusting screw 14 which makes a very fine adjustment of the pressure strip 5 in the particular ranges. The adjusting mechanism of the pressure strip 5 has no play, since it is always adjusted with or against the force of the tensioned disk spring 12. When the direction of adjustment of the ad~usting rods 8 changes, the flow of force does not change other than with the known adjusting screws.
Furthermore, the reference point that is selected during the coarse adjustment can be re-established very simply in that the adjusting screw 14 is turned until its face surface is once again level with the face surface of the screw 16. In order to establish the reference point more precisely, markings can be made on the face sur~aces of both screws 14, and these can then be aligned.
'~.
8 ~
, ~ .
WO 93/17795 PC~/EP93/00031 the other hand, it is stiff enough to accommodate the forces acting on the doctor blade without interfering with the thickness of the coating.
A further task of the present inven'ion is to create a coating device of this kind in which the contact pressure of the doctor blade can be set across the working width so as to be locally differentiated and extremely precise, it being possible to do this by a simple design.
Thls task has been solved by the faatures set out in patent claims 3 or 4, respectively.
In the apparatus according to claim 3, the spacing of the -~
individual adjusting points is so selected that the flexibility of the pressure strip is within a range that ensures both ¦ delicate adjustment of the contact pressure and ade~uate stability.
Patent claim 4 describes a particularly advantageous ~-configuration of the adjusting elements, with which the pressure ~ -strip can be bent to varying degrees at different points. The -adjusting elements permit adjustment of the pressure strip without any play, and without major construction costs.
j The particularly advantageous configuration described in claim 5 ` -~
permits both coarse and fine adjustment, the latter being effected by means of the differential screw principle. A further advantage is the fact that during coarse adjustment without the differential effect, it is possible to set a reference position that can be rPplicated and from which fine positioning is carried out when the differential effect is in effect.
- 21D22~7 Brief Description of the Drawinqs The drawings serve to explain the present invention on the basis of an embodiment that is shown there-Ln in simplified form. These drawings show the following:
igure 1: a longitudinal section through a pressure strip with the adjusting elements according to the present invention;
igure 2: a partially cross-sectioned perspective view.
A Way to Realize the Present Invention ~he coating device incorporates a driven counter-roller 1 by which the web 2 of material--a paper or cardboard web 8 m or more wide--is deflected. An excess of coating materia~ is applied to the web l of material by an applicator system ~not shown herein), ~nd this exce~ raked o~f ~removed) to the desired thickness by a metering system with an elastically flexible doctor blade 3 as the metering element. The foot of the doctor blade 3 is clamped in a clamping beam 4 that can be moved towards the counter-roller 1 and is supported on its side that is remote from the counter-roller 1, beneath the tip of the doctor blade, by a pressure strip 5 that is elastically flexible within limits, in the direction of the counter-roller. The contact pressure of the doctor blade 3 on the counter-roller 1 can be adjusted by a relative movement of the clamping beam 4 to the pressure strip 5 that extends across the whole width of the web.
The pressure strip 5 is of the same cross-section across its whole width--which corresponds to the maximum web width and thus ~228~
, WO 93~17795 PCT/E;P93/001~31 to the axial length of the counter-roller l. Its tip, which lies on the doctor blade 3 is either point:ed or rounded with a radius between 1 mm and 3 mm, in this example 2 mm. On the side that is remote from the doctor blade 3, the cross-section of the pressure strip 5 is rectangular and is matched to a groove 6 in its holder `- ~-7, which is open towards the doctor blade 3, in which the pressure strip 5 is supported so that it can move radially towards the counter-roller l. The height of the pressure strip 5, measured tangentially to the counter-roller 1, is approximately 20 mm and the width of its section that is of -~
rectangular cross-section, measured radially, is approximately 10 mm. It is preferred that it be of chromium-nickel steel;
alternatively, it can be manuEactured from carbon fibre reinforced plastic, for example, and/or be coated so as to be wear-resistant. Guiding it in the groove 6 of the holder 7 makes it possible to bend the pressure strip 5 in a bending plane that extends approximately radially to the counter-roller 1. In order to permit ~he finest possible adjustment of the line of contact on the doctor blade 3 without any disruptive rearward acting forces, the surface moment of inertia Ix of the pressure strip 5, measured perpendicular to the bending plane, is between 100 mm4 and 5,0004, preferably between 800 mm4 and 1,200 mm4; in the present example, is 1,000 mm4.
~n order that the pressure strip 5 can be bent transversely across the worXing width in order to set a desired cross-section profile of the thickness of the coating by a locally differentiated contact pressure of the doctor blade 3, there are drillings across the whole working width in its back, these being regularly spaced--the example every 75 mm--in each of which the end of an adjusting rod 8 is securely screwed. The adjusting rods 8 are guided so as to be able to move freely in an axial . :' i';~
2:1~2287 . . .
WO 93/17795 PCT~EP93/00031 direction in the drillings in the base plate 9 of the holder 7 that, at its end that is proximate to the doctor blade 3, has a rectangular notch that is covered over at the top by a cover plate 10 that is screwed to the base plate 9 to form the groove 6.
A sleeve 11 is drawn over the end of each adjusting rod 8 that ¦ extends out of the drilling in the base plate 3; a bead-like Z wider section of this rests against the base plate 9. At least l one disk spring 12 is installed over the sleeve 11, this rests at i one end against the bead, and at the other end against an I adjusting nut 13 that is screwed onto the end of the adjusting I rod 8. The adjusting nut 13 incorporates a drilling that is matched to the diameter of the sleeve 11 in order that it can move over the sleeve 11 so that it can adjust the tension of the spring 12 when it is rotated. The disk spring 12 presses the adjusting rod 8 away from the counter-roller 1 and thereby pulls on the pressure strip 5 in order to reduce the contact pressure on th~ doctor blade 3.
In order to adjust the rod 8 towards and away from the counter-roller 1 there is an adjusting screw 14 that has an inside drilling with a thread and an additional outside thread by which it is screwed into a thread of a holder 15 that is secured to the base plate 9. A further screw 16 is fitted into the continuous inside thread, coaxially to the adjusting rod 8 and this can be moved against the end of the adjusting rod 8 in a direction towa~ds the counter-roller 1 when it is rotated. At the end of the screw 16 there is a washer 17 that is of polygonal cross-section--in the example shown this is a hexaqon--and this presses against the end of the adjusting rod 8 throuqh a ball cap that is secured to it, in order to keep the friction as small as possible -. ..
,. ..
21~22~7 Wo 93/17795 PCT/~P93/00031 :
when the screw 16 is rotated. A cover 18 that can be securely screwed to the upper side of the holder 15 extends from this across the washer 17, the adjusting nut 13, and the disk spriny 12, as far as the cover plate 10 in order to seal up the ad~usting elements at the upper side. At the same time, its lower side is matched to the edges of the washer 17 so as to be in the same plane, and at its periphery 4 forms a positive fit in order to prevent any co-rotation of the washer 17 and thus of the screw 16 when the adjusting screw 14 is rotated. As can be seen in figure 2, each adjusting element has its own removahle cover 18 in order to permit co-rotation of the screw 16 for coarse adjustment by removal of a cover 18; this will be described in greater detail below. In order to permit the finest possible adjustment according to the differential screw principle, the outer thread of the adjusting screw 14 is of a smaller pitch than its inner thread, which corresponds to the outer thread of the screw 16. The screw 16 is somewhat longer than the adjusting screw 14 in which it is supported. Its outer face surface can thus be llned up wlth the outer ~ace surface of the ad~ustlng screw 14 to define a reference point.
The adjustment of a pre-selected curvature of the pressure strip 5 in order to even out the profile of the coating is effected as foilows:
First, with the cover 18 removed, the adjusting screws on the adjusting rods 18 are rotated into an axial position in which the disk springs 12 are at the desired tension. In the base position, the outer face surfaces of the screws are aligned with the outer face surfaces of the adjusting screws 14. Coarse adjustment is now made in that, with the cover 18 removed, each of the adjusting screws 14 is rotated until a reference position -- 21~22~7 Wo 93J17795 PCT/~P93/00031 is reached. When this is done, the hall caps of the washers 17 press the adjusting rods 8 in the direction of the counter-roller 1, against the force of the disk springs 12. The screw 16 rotates with the adjusting screw 14 for the friction at the ball cap of the washer 17 is negligible relative to the friction in the common thread o~ the adjusting screw 14. When the desired reference position is reached, from which the fine adjustm~nt can be made, the covers 18 are re-installed and secured and thus prevent any co-rotation of the screws 16. When an adjusting screw 14 is rotated further, the associated screw 16 changes its axial position relative to the adjusting screw 14 as a function of the pitch of the common thread. The washer 27 only moves towards the adjusting rod or away from it by the difference of the thread pitch, outwards and inwards on the adjusting screw 14 which makes a very fine adjustment of the pressure strip 5 in the particular ranges. The adjusting mechanism of the pressure strip 5 has no play, since it is always adjusted with or against the force of the tensioned disk spring 12. When the direction of adjustment of the ad~usting rods 8 changes, the flow of force does not change other than with the known adjusting screws.
Furthermore, the reference point that is selected during the coarse adjustment can be re-established very simply in that the adjusting screw 14 is turned until its face surface is once again level with the face surface of the screw 16. In order to establish the reference point more precisely, markings can be made on the face sur~aces of both screws 14, and these can then be aligned.
'~.
8 ~
Claims (7)
1. A pressure strip for a doctor blade in devices that are used to coat moving webs of material, in particular webs of paper or cardboard, that has a rounded or pointed edge with which to rest on the doctor blade and which in order to set a locally differentiated contact pressure, is elastically flexible across its length, characterized in that the surface moment of inertia measured perpendicular to the bending plane Ix of the pressure strip is between 100 mm4 and 5,000 mm4, and preferably between 800 mm 4 and 1,200 mm4.
2. A pressure strip as defined in claim 1, characterized in that the edge resting on the doctor blade has a radius between 1 mm and 3 mm.
3. A device for coating a moving web (2) of material, in particular a web of paper or cardboard, with a counter-roller (1) that deflects the web of material, with a doctor blade (3) that can be pressed on the counter-roller (1) and with a flexible pressure strip (5) that lies against the doctor blade (3), beneath its tip, which supports the doctor blade (3), and with a row of adjusting elements that are arranged across the working width, that act on the side (inside) that is remote from the doctor blade (3) so as to provide locally differentiated contact pressure of the doctor blade (3) on the pressure strip (5), characterized in that the pressure strip (5) has the features described in claim 1 or claim 2 and the adjusting elements are spaced at a distance of 50 mm to 200 mm, in particular 70 to 120 mm, from each other.
4. A device for coating a moving web (2) of material, in particular a web of paper or cardboard, with a counter-roller (1) that deflects the web of material, with a doctor blade (3) that can be pressed on the counter-roller (2), and with a flexible pressure strip (5) that lies on the doctor blade (3) beneath its tip, that supports the doctor blade (3) and with a row of adjusting elements that are arranged across the working width, which in order to set a locally differentiated contact pressure of the doctor blade (3) act on the pressure strip (5) on the side (backside) that is remote from the doctor blade (3), characterized by a series of adjuster elements with the following features:
a) an adjuster rod (8) that is secured to the back of the pressure strip (5) so as to be axially moveable, which is guided by a holder (7);
b) a spring (12) is slid over the end of the adjuster element (8), one end of said spring resting against the holder (7), and the other end being tensioned by an adjuster nut (13) that is screwed onto the end of the adjuster rod (8);
c) an adjustable screw (16) that is arranged coaxially to the adjuster rod (8) and so as to be adjustable presses against the force of the spring (12) towards the counter-roller (1).
a) an adjuster rod (8) that is secured to the back of the pressure strip (5) so as to be axially moveable, which is guided by a holder (7);
b) a spring (12) is slid over the end of the adjuster element (8), one end of said spring resting against the holder (7), and the other end being tensioned by an adjuster nut (13) that is screwed onto the end of the adjuster rod (8);
c) an adjustable screw (16) that is arranged coaxially to the adjuster rod (8) and so as to be adjustable presses against the force of the spring (12) towards the counter-roller (1).
5. A device as defined in claim 4, characterized in that the screw (16) is screwed into the internal thread of another coaxial screw (adjuster screw 14), the inner thread of the adjuster screw (14) having a different pitch than its outer thread, and the inner screw (16) being prevented from co-rotating by releasable elements (the cover 18).
6. A device as defined in claim 4 or claim 5, characterized by a pressure strip with the features set out in claim 1 or claim 2.
7. A device as defined in one of the claims 4 to 6, characterized in that the holder (7) has on its side that is proximate to the counter-roller (1) a guide groove (6) for the pressure strip (5), said guide nut extending across the working width.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4207731.1 | 1992-03-11 | ||
| DE4207731A DE4207731A1 (en) | 1992-03-11 | 1992-03-11 | SUPPORT BAR FOR A COATING DEVICE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2102287A1 true CA2102287A1 (en) | 1993-09-12 |
Family
ID=6453789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002102287A Abandoned CA2102287A1 (en) | 1992-03-11 | 1993-01-09 | Pressure strip for coating device |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0583437B1 (en) |
| JP (1) | JPH06507576A (en) |
| AT (1) | ATE153569T1 (en) |
| CA (1) | CA2102287A1 (en) |
| DE (2) | DE4207731A1 (en) |
| ES (1) | ES2105216T3 (en) |
| FI (1) | FI108524B (en) |
| WO (1) | WO1993017795A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5597415A (en) * | 1995-02-09 | 1997-01-28 | Voith Sulzer Paper Technology North America, Inc. | Profiling bar for a web coating device |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4334556A1 (en) * | 1993-10-11 | 1995-04-13 | Jagenberg Ag | Device for coating a material web, in particular a paper or cardboard web |
| DE4334555C2 (en) * | 1993-10-11 | 2003-06-26 | Jagenberg Papiertech Gmbh | Mount for a squeegee rod |
| US5480486A (en) * | 1993-12-21 | 1996-01-02 | Beloit Technologies, Inc. | Continuous adjustable backing bar for profiling coater blade |
| GB2305873B (en) * | 1995-10-07 | 1999-06-02 | Crabtree Gateshead Ltd | Roll cleaning assembly |
| DE19734718A1 (en) * | 1997-08-11 | 1999-02-18 | Voith Sulzer Papiermasch Gmbh | Web coating applicator |
| NL1007246C2 (en) * | 1997-08-26 | 1999-03-01 | Stork Brabant Bv | Screen printing machine for textiles |
| DE29716647U1 (en) * | 1997-09-17 | 1997-10-30 | Voith Sulzer Papiermasch Gmbh | Pressure bar |
| DE19753899A1 (en) * | 1997-12-05 | 1999-06-10 | Jagenberg Papiertech Gmbh | Pneumatically actuated control element, in particular for regulating the cross profile in a coating device for paper or cardboard webs |
| DE19755411A1 (en) * | 1997-12-12 | 1999-06-17 | Voith Sulzer Papiertech Patent | Doctor device |
| DE19812929A1 (en) * | 1998-03-24 | 1999-09-30 | Voith Sulzer Papiertech Patent | Machine continuously metering and leveling coating of fluid or viscous material |
| DE19827234A1 (en) * | 1998-06-18 | 1999-12-23 | Voith Sulzer Papiertech Patent | Coating station for the application of a medium to a moving web surface |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2825907B2 (en) * | 1978-06-13 | 1981-02-26 | Jagenberg-Werke Ag, 4000 Duesseldorf | Device for applying a coating to a material web |
| DE3729621A1 (en) * | 1987-09-04 | 1989-03-16 | Jagenberg Ag | DEVICE FOR COATING A MATERIAL RAIL THROUGH A COUNTER ROLLER |
| DE3927329A1 (en) * | 1989-08-18 | 1991-02-21 | Jagenberg Ag | DEVICE FOR COATING A MATERIAL RAIL THROUGH A COUNTER ROLLER |
| DE3934986A1 (en) * | 1989-10-20 | 1991-04-25 | Jagenberg Ag | Doctor blade adjustment - has setting motor with selective coupling to adjustment units for local and automatic setting while working |
| DE9112595U1 (en) * | 1991-06-15 | 1991-11-28 | J.M. Voith Gmbh, 7920 Heidenheim, De |
-
1992
- 1992-03-11 DE DE4207731A patent/DE4207731A1/en not_active Withdrawn
-
1993
- 1993-01-09 DE DE59306569T patent/DE59306569D1/en not_active Expired - Lifetime
- 1993-01-09 ES ES93902160T patent/ES2105216T3/en not_active Expired - Lifetime
- 1993-01-09 WO PCT/EP1993/000031 patent/WO1993017795A1/en active IP Right Grant
- 1993-01-09 EP EP93902160A patent/EP0583437B1/en not_active Expired - Lifetime
- 1993-01-09 AT AT93902160T patent/ATE153569T1/en not_active IP Right Cessation
- 1993-01-09 JP JP5515272A patent/JPH06507576A/en active Pending
- 1993-01-09 CA CA002102287A patent/CA2102287A1/en not_active Abandoned
- 1993-11-10 FI FI934967A patent/FI108524B/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5597415A (en) * | 1995-02-09 | 1997-01-28 | Voith Sulzer Paper Technology North America, Inc. | Profiling bar for a web coating device |
Also Published As
| Publication number | Publication date |
|---|---|
| FI934967A (en) | 1993-11-10 |
| FI934967A0 (en) | 1993-11-10 |
| FI108524B (en) | 2002-02-15 |
| ES2105216T3 (en) | 1997-10-16 |
| JPH06507576A (en) | 1994-09-01 |
| EP0583437B1 (en) | 1997-05-28 |
| WO1993017795A1 (en) | 1993-09-16 |
| DE59306569D1 (en) | 1997-07-03 |
| DE4207731A1 (en) | 1993-09-16 |
| EP0583437A1 (en) | 1994-02-23 |
| ATE153569T1 (en) | 1997-06-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |