CA2114464A1 - Device for coating free-flowing media onto a moving web - Google Patents
Device for coating free-flowing media onto a moving webInfo
- Publication number
- CA2114464A1 CA2114464A1 CA 2114464 CA2114464A CA2114464A1 CA 2114464 A1 CA2114464 A1 CA 2114464A1 CA 2114464 CA2114464 CA 2114464 CA 2114464 A CA2114464 A CA 2114464A CA 2114464 A1 CA2114464 A1 CA 2114464A1
- Authority
- CA
- Canada
- Prior art keywords
- web
- spreading device
- improvement
- roll
- paper web
- 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
- D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
- D21H23/56—Rolls
-
- 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
- B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
- B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
- B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
-
- 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
- B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
- B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
- B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
- B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets
-
- 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
- B05C11/023—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
- B05C11/025—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface with an essentially cylindrical body, e.g. roll or rod
-
- 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
- B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
- B05C9/04—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material to opposite sides of the work
-
- 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
- D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod
Landscapes
- Coating Apparatus (AREA)
Abstract
DEVICE FOR COATING FREE-FLOWING MEDIA
ONTO A MOVING WEB
ABSTRACT OF THE DISCLOSURE
An apparatus for coating free-flowing media onto a moving paper web includes two rotatably mounted rolls having parallel axes and being driven in opposite directions. The two rolls define a roll gap for the passage of a paper web therethrough. Cooperating with each roll is an application unit for applying a free-flowing medium onto a lateral surface of the roll.
A spreading device is disposed downstream of the roll gap at a side of the paper web and substantially contacts the paper web across a width thereof.
ONTO A MOVING WEB
ABSTRACT OF THE DISCLOSURE
An apparatus for coating free-flowing media onto a moving paper web includes two rotatably mounted rolls having parallel axes and being driven in opposite directions. The two rolls define a roll gap for the passage of a paper web therethrough. Cooperating with each roll is an application unit for applying a free-flowing medium onto a lateral surface of the roll.
A spreading device is disposed downstream of the roll gap at a side of the paper web and substantially contacts the paper web across a width thereof.
Description
DEVI~E FOR CQATING FREE-FLOWING MEDIA
ONTO A MOVING WEB
The invention relates to apparatus for 0 applying a free-flowing medium onto a web of material paxticularly to apparatus for applying a liquid coating onto a web moving through a roll gap defined by two rotatably mounted rolls disposed with their axes parallel to one another and including an 5 application unit cooperating which each roll for applying a free-flowing media onto a lateral surface of the roll.
-,:
,, ' '. .:.
Reference is made herein to 5erman ~ ~ -Offenlegungsschrift 34 17 487 ~corresponding to G~ 2 -~
15~ 370 published November 13, 1985) which discloses devices for applying free-flowing media onto a web of paper. Devices of this type can be disposed within or 5 outside a paper manufacturing machine. The liquid to be applied to a paper web being conveyed through such a device can be, for example, a sizing suspension with which the paper web i9 impregnated; that is, the sizing suspen3ion substantially penetrates the paper web. -~
However, the liquid can also be a coating composition ~uch as various pigment suspensions which form a covering layer on a paper web. The known method~ for applying and distributing a coating composition on a paper web often result in the formation of a covering 35 layer which is not uniformly closed. The-optical -~
appearance of such a covering layer may be described as the "orange-peel effect. n - 2 ~ 4~
It is an object of the invention to obviate or mitigate one or more of the problems described above. In S particular, it is an object of the invention to provide an apparatus for coating free-flowing media onto a paper web in such a way that the problem of an undesirable orange peel effect of the liquid film on the paper web is substantially avoided. Thus, coated }0 papers with a uniform surface can be produced.
According to the invention, an apparatus for applying a liquid coating onto a web of material includes two rotatably mounted rolls disposed with their axes parallel to one another and defining a roll gap through which a web may be conveyed. The apparatus further includes an application unit cooperating with each roll for applying a free-flowing medium onto a lateral surface of the roll. In an open area of the apparatus, downstream from the roll gap with respect to the direction of travel of a web being conveyed through the apparatus, at lea~t one spreading device is -provided and is disposed on a side of the web. The - -spreading device substantially contacts a width of the ~-web. ~- -The spreading device or devices according to the invention cause spreading by rubbing a coating --~ -composition, while still in the free-flowing state, as a rssult of the relative velocity between the web on the one hand and the working ~urface of the spreading 30 device which is in contact with the web, 90 that a -~
clo~ed and largely uniformly coated web surface is i achieved. This may be accomplished by one or more of following: a rotating movement of the spreading device; an oscillating movement of the device around its own longitudinal axis; an oscillating movement of the device transverse to the direction of movement of a web being conveyed through the apparatus; and/or a longitudinal oscillating movement with respect to the direction of movèment of the web (i.e. with respect to the length of the web).
Preferred embodiments of the present invention will now be described by way of example only, with reference to the attached Figures wherein:
Fig. 1 i9 a schematic sectional view of an apparatus according to the invention.
Fig. 2a i8 a schematic sectional view showing a second embodiment of an apparatus according to the invention.
Fig. 2b is a schematic sectional view showing a third embodiment of an apparatus according to the invention.
Fig. 3a is a schematic sectional view showing ~ ;
a fourth embodiment of an apparatu~ according to the invention.
Fig. 3b is a schematic sectional view showing ~ -a fifth embodiment of an apparatus according to the invention. -Fig. 4 is a schematic sectional view showing ~-a sixth embodiment of an apparatus according to the invention.
Fig. 5a is a par~ial cross-sectional view of a spreading device according to the invention taken --along line V-V of Fig. 4.
Fig. 5b is a partial cross-sectional view of a second embodiment of a spreading device according tO
the invention.
Fig. 5c is a partial cross-sectional view of a third embodiment of a spreading device according to the invention.
Fig. 6a is a partial top plan view of a spreading device according to the invention referenced by the arrow VI in Fig. 4.
Fig. 6b is a partial top plan view of a ~econd embodiment of a spreading device according to the invention.
Fig. 6c i9 a partial top plan view of a third embodiment of a spreading device according to the invention.
Fig. 1 shows an apparatus according to the invention which includes a two-roll press defining a roll gap for applying a coating on one side of a moving paper web, with a spreading device disposed downstream the roll gap.
The two-roll press shown in Fig. 1 includes rotatably mounted rolls 1 and 2, the axes of which are disposed parallel to one another. Together, the rolls 1 and 2 define a roll gap 3 for passage of a paper web 4 therethrough. The rolls 1 and 2 are driven in opposite directions. ~pplication unit~ 5 and 6 are di3posed at a outer or lateral side of the rolls 1 and 2, respectively (i.e. each application unit is located at a lateral side of the roll where the surface of the roll moves from the bottom to the top of the roll when the roll is rotating). Each application unit applies a -free-flowing medium onto the lateral surface of the re~pective roll and the free-flowing medium is subsequently depoqited onto the paper web 4. The application device 5 applies a coating onto the roll 1 and the application device 6 applies sizing onto the roll 2. The paper web 4 is guided from the top o~ the apparatus (and the rolls 1 and 2) toward the bottom thereof through the roll gap 3. In areas 7 and 8 which the roll gap 3 forms with the paper web 4, a film of the free-flowing medium is applied onto the paper web 4 along the surface of the rolls 1 and/or 2. As a result of guiding the paper web 4 from top to bottom through the roll gap 3, the coating composition is applied onto the paper web 4 in a desired thickness.
Subsequent to the application of the free-flowing media onto the paper web 4, in a relatively unobstructed or open area of the apparatu~ immediately downstream of the roll gap (with respect to the direction of conveyance of a paper web) generally ~~ designated 9, a spreading device 10 is mounted on the apparatus so as to be disposed on a side of the paper web 4 upon which the coating composition was applied by the roll 1. The spreading device 10 i9 a rotationally symmetrical body (i.e. the spreading device 10 is symmetrical about an axis thereof) and more particularly may be a spreader roll 10. The spreader roll 10 is pres~ed against the paper web 4 coated with the coating composition, using a certain pressure. The 10 spreader roll 10 is rotatably mounted and is driven. -~
The spreader roll 10 rotates about its axis in the direction of movement of the paper web 4 or in the opposite direction thereof and, with the aid of another drive (not shown) the spreader roll 10 performs ~;~
oscillating movements transverse to the direction of movement of the paper web 4.
The paper web 4 is then introduced to further working devices via a deflecting device, which is shown -~
here as a deflecting roll 11. ~-Overall, there are various spreading device -driving possibilities. The main differentiating -~
characteristics between these driving possibilities are the direction of rotation of the spreader roll 10 with respect to the direction of movement of the paper web 4 and the relative velocity between the spreader roll circumference and the paper web 4.
If the ~preader roll 10 rotates in the direction of movement of the web 4 and the relative velocity between the spreader roll circumference and the paper web 4 i8 equal to zero, then a spreading effect can be accomplished only under the following conditions:
(1~ when the spreader roll 10 performs oscillating movements oriented longitudinally with respect to the length of the paper web 4;
(2) when the spreader roll 10 performs oscillating movements transverse to the length of the paper web 4; and (3) when the spreader roll 10 performs a combination of transverse and longitudinal movement with respect to the paper web 4.
} ~ i iA ~ ~
If the rotational velocity of the sp.eader roll 10 i9 not equal to the velocity of conveyance of the paper web 4, that i9, the relative velocity between ;
the spreader roll periphery and the paper web is not equal to zero, a corresponding spreading effect is achieved mainly by the rotational movement of the spreader roll 10. The spreading effect is enhanced by additional oscillation of the spreader roll 10. A
superimposition of spreader roll rotation and oscillating movement with respect to the paper web 4 makes it possible to provide spreading of a coating in the direction of movement of the paper web 4 and transversely to this direction of movement. If the spreader roll 10 only rotates, spreading-of a coating is provided in the direction of movement of the paper web 4.
In summary, the following possibilities arise when a spreader roll 10 is rotated in the direction of movement of the paper web 4 and there is a relative velocity between the spreader roll periphery and the paper web:
~ 1) the spreader roll 10 performs only a pure rotational movement;
(2) the spreader roll lO also perform~
oscillating movements transverse to the length of the paper web 4;
(3) the spreader roll 10 additionally performs a longitudinaL oscillating movement with respect to the movement of the paper web 4 (i.e.
corresponding to the length of the paper web);
ONTO A MOVING WEB
The invention relates to apparatus for 0 applying a free-flowing medium onto a web of material paxticularly to apparatus for applying a liquid coating onto a web moving through a roll gap defined by two rotatably mounted rolls disposed with their axes parallel to one another and including an 5 application unit cooperating which each roll for applying a free-flowing media onto a lateral surface of the roll.
-,:
,, ' '. .:.
Reference is made herein to 5erman ~ ~ -Offenlegungsschrift 34 17 487 ~corresponding to G~ 2 -~
15~ 370 published November 13, 1985) which discloses devices for applying free-flowing media onto a web of paper. Devices of this type can be disposed within or 5 outside a paper manufacturing machine. The liquid to be applied to a paper web being conveyed through such a device can be, for example, a sizing suspension with which the paper web i9 impregnated; that is, the sizing suspen3ion substantially penetrates the paper web. -~
However, the liquid can also be a coating composition ~uch as various pigment suspensions which form a covering layer on a paper web. The known method~ for applying and distributing a coating composition on a paper web often result in the formation of a covering 35 layer which is not uniformly closed. The-optical -~
appearance of such a covering layer may be described as the "orange-peel effect. n - 2 ~ 4~
It is an object of the invention to obviate or mitigate one or more of the problems described above. In S particular, it is an object of the invention to provide an apparatus for coating free-flowing media onto a paper web in such a way that the problem of an undesirable orange peel effect of the liquid film on the paper web is substantially avoided. Thus, coated }0 papers with a uniform surface can be produced.
According to the invention, an apparatus for applying a liquid coating onto a web of material includes two rotatably mounted rolls disposed with their axes parallel to one another and defining a roll gap through which a web may be conveyed. The apparatus further includes an application unit cooperating with each roll for applying a free-flowing medium onto a lateral surface of the roll. In an open area of the apparatus, downstream from the roll gap with respect to the direction of travel of a web being conveyed through the apparatus, at lea~t one spreading device is -provided and is disposed on a side of the web. The - -spreading device substantially contacts a width of the ~-web. ~- -The spreading device or devices according to the invention cause spreading by rubbing a coating --~ -composition, while still in the free-flowing state, as a rssult of the relative velocity between the web on the one hand and the working ~urface of the spreading 30 device which is in contact with the web, 90 that a -~
clo~ed and largely uniformly coated web surface is i achieved. This may be accomplished by one or more of following: a rotating movement of the spreading device; an oscillating movement of the device around its own longitudinal axis; an oscillating movement of the device transverse to the direction of movement of a web being conveyed through the apparatus; and/or a longitudinal oscillating movement with respect to the direction of movèment of the web (i.e. with respect to the length of the web).
Preferred embodiments of the present invention will now be described by way of example only, with reference to the attached Figures wherein:
Fig. 1 i9 a schematic sectional view of an apparatus according to the invention.
Fig. 2a i8 a schematic sectional view showing a second embodiment of an apparatus according to the invention.
Fig. 2b is a schematic sectional view showing a third embodiment of an apparatus according to the invention.
Fig. 3a is a schematic sectional view showing ~ ;
a fourth embodiment of an apparatu~ according to the invention.
Fig. 3b is a schematic sectional view showing ~ -a fifth embodiment of an apparatus according to the invention. -Fig. 4 is a schematic sectional view showing ~-a sixth embodiment of an apparatus according to the invention.
Fig. 5a is a par~ial cross-sectional view of a spreading device according to the invention taken --along line V-V of Fig. 4.
Fig. 5b is a partial cross-sectional view of a second embodiment of a spreading device according tO
the invention.
Fig. 5c is a partial cross-sectional view of a third embodiment of a spreading device according to the invention.
Fig. 6a is a partial top plan view of a spreading device according to the invention referenced by the arrow VI in Fig. 4.
Fig. 6b is a partial top plan view of a ~econd embodiment of a spreading device according to the invention.
Fig. 6c i9 a partial top plan view of a third embodiment of a spreading device according to the invention.
Fig. 1 shows an apparatus according to the invention which includes a two-roll press defining a roll gap for applying a coating on one side of a moving paper web, with a spreading device disposed downstream the roll gap.
The two-roll press shown in Fig. 1 includes rotatably mounted rolls 1 and 2, the axes of which are disposed parallel to one another. Together, the rolls 1 and 2 define a roll gap 3 for passage of a paper web 4 therethrough. The rolls 1 and 2 are driven in opposite directions. ~pplication unit~ 5 and 6 are di3posed at a outer or lateral side of the rolls 1 and 2, respectively (i.e. each application unit is located at a lateral side of the roll where the surface of the roll moves from the bottom to the top of the roll when the roll is rotating). Each application unit applies a -free-flowing medium onto the lateral surface of the re~pective roll and the free-flowing medium is subsequently depoqited onto the paper web 4. The application device 5 applies a coating onto the roll 1 and the application device 6 applies sizing onto the roll 2. The paper web 4 is guided from the top o~ the apparatus (and the rolls 1 and 2) toward the bottom thereof through the roll gap 3. In areas 7 and 8 which the roll gap 3 forms with the paper web 4, a film of the free-flowing medium is applied onto the paper web 4 along the surface of the rolls 1 and/or 2. As a result of guiding the paper web 4 from top to bottom through the roll gap 3, the coating composition is applied onto the paper web 4 in a desired thickness.
Subsequent to the application of the free-flowing media onto the paper web 4, in a relatively unobstructed or open area of the apparatu~ immediately downstream of the roll gap (with respect to the direction of conveyance of a paper web) generally ~~ designated 9, a spreading device 10 is mounted on the apparatus so as to be disposed on a side of the paper web 4 upon which the coating composition was applied by the roll 1. The spreading device 10 i9 a rotationally symmetrical body (i.e. the spreading device 10 is symmetrical about an axis thereof) and more particularly may be a spreader roll 10. The spreader roll 10 is pres~ed against the paper web 4 coated with the coating composition, using a certain pressure. The 10 spreader roll 10 is rotatably mounted and is driven. -~
The spreader roll 10 rotates about its axis in the direction of movement of the paper web 4 or in the opposite direction thereof and, with the aid of another drive (not shown) the spreader roll 10 performs ~;~
oscillating movements transverse to the direction of movement of the paper web 4.
The paper web 4 is then introduced to further working devices via a deflecting device, which is shown -~
here as a deflecting roll 11. ~-Overall, there are various spreading device -driving possibilities. The main differentiating -~
characteristics between these driving possibilities are the direction of rotation of the spreader roll 10 with respect to the direction of movement of the paper web 4 and the relative velocity between the spreader roll circumference and the paper web 4.
If the ~preader roll 10 rotates in the direction of movement of the web 4 and the relative velocity between the spreader roll circumference and the paper web 4 i8 equal to zero, then a spreading effect can be accomplished only under the following conditions:
(1~ when the spreader roll 10 performs oscillating movements oriented longitudinally with respect to the length of the paper web 4;
(2) when the spreader roll 10 performs oscillating movements transverse to the length of the paper web 4; and (3) when the spreader roll 10 performs a combination of transverse and longitudinal movement with respect to the paper web 4.
} ~ i iA ~ ~
If the rotational velocity of the sp.eader roll 10 i9 not equal to the velocity of conveyance of the paper web 4, that i9, the relative velocity between ;
the spreader roll periphery and the paper web is not equal to zero, a corresponding spreading effect is achieved mainly by the rotational movement of the spreader roll 10. The spreading effect is enhanced by additional oscillation of the spreader roll 10. A
superimposition of spreader roll rotation and oscillating movement with respect to the paper web 4 makes it possible to provide spreading of a coating in the direction of movement of the paper web 4 and transversely to this direction of movement. If the spreader roll 10 only rotates, spreading-of a coating is provided in the direction of movement of the paper web 4.
In summary, the following possibilities arise when a spreader roll 10 is rotated in the direction of movement of the paper web 4 and there is a relative velocity between the spreader roll periphery and the paper web:
~ 1) the spreader roll 10 performs only a pure rotational movement;
(2) the spreader roll lO also perform~
oscillating movements transverse to the length of the paper web 4;
(3) the spreader roll 10 additionally performs a longitudinaL oscillating movement with respect to the movement of the paper web 4 (i.e.
corresponding to the length of the paper web);
(4) the ~preader roll 10 performs a combination of longitudinal and transverse movement with respect to the direction of movement of the paper web 4.
If the spreader roll 10 rotates in a direction opposite to the direction of movement of the -`
paper web 4, a spreading effect can be achieved by the ~;~
rotation of the spreader roll 10 alone, longitudinally with respect to the length of the paper web 4 and its 40 direction of movement. Additional oscillation of the -spreader roll 10 transverse to the directior. of movement of the paper web 4 further promotes the spreading effect. Oscillating movements of the spreader roll 10 which are longitudinal with respect to the direction of movement of the paper web 4 and a combination of longitudinal and transverse movement of the roll 10 with respect to the paper web 4 are possible. ~;
If the spreader roll 10 is rotatably mounted and is not driven, the roll 10 can be entrained by the 10 paper web 4 due to the paper web velocity. It may ~ ~ ~
therefore be necessary to equip the apparatus with a ~ -further device which brakes the spreader roll 10 in order to achieve a spreading effect on the paper web 4. -~
Additionally, it is also expedient to provide the 15 spreader roll 10 with a drive which allows the roll 10 ~ -to perform oscillating movements transversely to the direction of movement of the paper web 4 in order to provide good spreading effect over the entire plane of the surface of the paper web 4.
The surface of the spreader roll 10 can be smooth or contoured. Another possibility is to use a spreader roll having a wire wound therearound. Smooth spreader rolls are preferably provided with a finish, such as a chromium (Cr) coating material (or several coating materials) which repels the liquid coating being applied to the paper web. The spreader roll finish could be made from any of a variety of materials which are resistant to wear, for example, Teflon~ (Du Pont), rubber, polyurethane or ceramic. The diameter of the spreader roll 10 is preferably about 100 to about 400 mm.
Fig. 2a shows an apparatus according to the ~ ;
invention which is analogous to the apparatus shown in Fig. 1 and includes a two-roll press having rolls la 35 and 2a defining a roll gap for applying coating onto ;~
both sides of a paper web 4a, with rods on both sides of the paper web utilized as spreading devices and further includes a downstream smooth deflecting roll.
The axes of the rolls la and 2a are arranged parallel to one another, are rotatably mounted and define a roll :' ' - -~ ' - 8 - J i i gap 3a for passage of the paper web 4a. The two rolls -~
la and 2a are driven in opposite directions.
Application units 5a and 6a for applying a free-flowing medium onto the rolls are arranged on the sides of the rolls la and 2a, respectively, near a part of each roll circumference which travels from the ~ ~
bottom toward the top of the respective roll. The ~ -paper web 4a is guided from the top to the bottom of the rolls la and 2a through the roll gap 3a. In regions 7a and 8a, which form the roll gap 3a with the paper web 4a, a film of free-flowing medium i9 applied onto the paper web 4a.
The elements la - 9a illustrated in Fig. 2a are substantially identical in structure and function to the elements 1 - 9, respectively, described herein with respect to Fig. 1. However, both of the application units 5a and 6a apply a coating onto a surface of the rolls la and 2a, respectively. As a result of guiding the paper web 4a from top to bottom through the roll gap 3a, a coating composition i~
applied onto both sides of the paper web 4a in a desired thickne g.
In a downstream section 9a of the apparatus shown in Fig. 2a, spreading devices illustrated as spreading rods lOa are disposed on both sides of the paper web 4a to spread the coating composition thereon.
The spreading rods lOa have a symmetry similar to the devices 10 described with respect to Fig. 1. The surface of each rod lOa can be smooth and each rod preferably has a diameter of between about 10 mm and about 30 mm. Each rod lOa may have a wire wrapped therearound to provide a contoured rod surface.
The rods; lOa do not rotate. In order to achieve good spreading effect, additional drive ~-35 possibiIities are provided (not shown in Fig. 2a) in ~ -order to achieve oscillating movements around the rod axis, as well as longitudinally or transversely with ~ -respect to the direction of movement of the paper web 4a. A combination of longitudinal and transverse movement of each rod lOa relative to the paper web 4a may also be provided.
9 ,.. i 1 '~
'~ According to the invention it is also possible to replace the rods lOa located on either side of the paper web 4a with the driven spreader rolls 10 described with respect to Fig. 1. -~
Preferably, the spreading rods lOa are ~ -arranged on both sides of the paper web in such a way that the rods lOa are evenly displaced with respect to one another in the direction of movement of the paper web 4a. In particular, the axis of a fir3t spreading device lOa may be di~posed in a first plane perpendicular to a tangent of the web 4a conveyed about the first spreading device lOa and the axis of the second spreading device lOa is disposed in a ~econd plane perpendicular to a tangent of the web 4a conveyed about the second spreading device lOa, with the first and second planes being parallel.
Downstream the rods lOa, the paper web 4a is guided further by contact with a deflection roll lla.
To avoid contact of a still wet or moist coated paper web 4a with the deflection roll lla a drying apparatus (not shown) may be provided between the deflection roll lla and the spreading device lOa.
An alternative-spreading device orientation according to the~invention is shown in Fig. 2b. The elements lb - 9b, and llb, of the apparatus shown in Fig. 2b are identical in structure, function and orientation to elements la - 9a, and lla, respectively, described herein with re~pect to Fig. 2a. Spreading ~-devices lOb shown in Fig. 2b are identical in function and structure to the spreading devices lOa described herein with respect to Fig. 2a. However, the axes of the spreading devices lOb shown in Fig. 2b are disposed in a common plane perpendicular to the direction of movement of the web 4b conveyed between the spreading 35 devices lOb. ~-Fig. 3a shows a modified two-roll press -according to the invention similar to what i described herein with respect to Fig. 2a having first and second rolls defining a roll gap for applying coating onto both sides of a paper web with spreading devices arranged on both sides of the paper web and including an air-cushioned deflection device and a subsequent infrared drying device.
Elements lc - lOc of the apparatus shown in Fig. 3a are identical in structure, function and orientation to elements la - lOa, respectively, described herein with respect to Fig. 2a. The spreading device~ or rods lOc can be designed as rods described with respect to Figs. 2a and 2b or as driven spreader rolls as described with respect to Fig. 1.
having the drive possibilities already described with respect thereto.
The apparatus shown in Fig. 3a is equipped with an air-cushion deflecting device llc so that the paper web 4c i~ deflected without contact to a deflection roll or any other element of the device.
The advantage of this is that paper webs which still contain moist coating can be deflected with a deflecting device without direct contact with the side of the paper web that still contains moist coating and thus prior intermediate drying is not required. Then the paper web 4c i~ dried u~ing an infrared device 12c.
Another possibility of subsequent drying is shown in Fig. 3b. An apparatus according to the invention shown in Fig. 3b includes a two-roll press --defining a roll gap for applying coating onto both sides of a paper web with spreading devices disposed on both sides of the paper web, an air-cushioned deflection device and a sub~equent infrared and suspension drying device.
The elements ld - 12d of the apparatus shown in Fig. 3b are identical in structure, function and orientation to the elements lc - 12c, respectively, -described herein with respect to Fig. 3a.
Additionally, the apparatus shown in Fig. 3b includes a suspension dryer 13 downstream of the infrared drying device 12d.
The two-roll press shown in Fig. 4 corresponds in construction and function essentially to the embodiment shown in Fig. 2 and includes first and second roll~ defining a roll gap for applying coating onto both sides of a paper web with rods arranged on both sides of the paper web, spreading devices each having a convex working surface for contacting a coated paper web and a downstream smooth deflecting roll.
The elements le - 9e of the apparatus shown in Fig. 4 are identical in structuxe, function and orientation to the elements la - 9a, respectively, described herein with respect to Fig. 2a. Rods lOe which are u3ed as spreading devices have convex working surfaces lOf as viewed from the sides thereof. The rods lOe are also known as ~hydrobar shoes. n The radius of curvature of the working surface lOf of a rod lOe i9 preferably chosen to be larger than the radius of the rod lOe so that the effective working sur~ace of the spreading device is enlarged.
Hydrobar shoes having a working surface lOf can be stationary or can be equipped with an additional drive (not shown) to produce oscillating movements transverse to the direction of movement of the paper web 4e.
The surface lOf of a hydrobar shoe can be --smooth or contoured as shown in Figs. 5a - 5c and 6a -6c. Preferably, the contoured profile does not extend over the entire working surface lOf of the hydrobar -shoe, but only throughout a first ascending curved portion in the direction of movement of the paper web 4e. The subsequent de~cending part of the shoe is preferably smooth. AS a result, an initially uneven coating compo~ition covering the paper web will first be roughened and then uniformly spread by such a working surface lOf. Then the paper web 4e is introduced, for example, to a subsequent drying device or devices via a deflecting device lle.
Figs. 5a, 5b and 5c show possibilitie~ for 35 the design of the hydrobar shoe surface contour. The ~ -profile of the working surface shown in Fig. 5a i9 wavy. Figs. 5b and 5c show the possibility of using a tooth profile and a rack profile, respectively. ~-Figs. 6a, 6b and 6c show various po33ible profile contours from a top view of the surface lOf of the hydrobar shoe lCe. Parallel profile contours, - 12 - J i 1 ~ L~
-~ profile contours with a slope and profile contours with alternating slopes can be provided.
The selection of the spreading device or devices according to the invention to be used, their number (e.g. the possibilities of connecting spreading devices one after another on the 3ame side of the paper web), and the possibilities of operation are chosen for a each specific application and according to the effect to be achieved.
The foregoing detailed description is given for clearness of understanding only, an no unnecessary limitations should be understood therefrom, as modifications within the scope of the invention will be apparent to those skilled in the art.
If the spreader roll 10 rotates in a direction opposite to the direction of movement of the -`
paper web 4, a spreading effect can be achieved by the ~;~
rotation of the spreader roll 10 alone, longitudinally with respect to the length of the paper web 4 and its 40 direction of movement. Additional oscillation of the -spreader roll 10 transverse to the directior. of movement of the paper web 4 further promotes the spreading effect. Oscillating movements of the spreader roll 10 which are longitudinal with respect to the direction of movement of the paper web 4 and a combination of longitudinal and transverse movement of the roll 10 with respect to the paper web 4 are possible. ~;
If the spreader roll 10 is rotatably mounted and is not driven, the roll 10 can be entrained by the 10 paper web 4 due to the paper web velocity. It may ~ ~ ~
therefore be necessary to equip the apparatus with a ~ -further device which brakes the spreader roll 10 in order to achieve a spreading effect on the paper web 4. -~
Additionally, it is also expedient to provide the 15 spreader roll 10 with a drive which allows the roll 10 ~ -to perform oscillating movements transversely to the direction of movement of the paper web 4 in order to provide good spreading effect over the entire plane of the surface of the paper web 4.
The surface of the spreader roll 10 can be smooth or contoured. Another possibility is to use a spreader roll having a wire wound therearound. Smooth spreader rolls are preferably provided with a finish, such as a chromium (Cr) coating material (or several coating materials) which repels the liquid coating being applied to the paper web. The spreader roll finish could be made from any of a variety of materials which are resistant to wear, for example, Teflon~ (Du Pont), rubber, polyurethane or ceramic. The diameter of the spreader roll 10 is preferably about 100 to about 400 mm.
Fig. 2a shows an apparatus according to the ~ ;
invention which is analogous to the apparatus shown in Fig. 1 and includes a two-roll press having rolls la 35 and 2a defining a roll gap for applying coating onto ;~
both sides of a paper web 4a, with rods on both sides of the paper web utilized as spreading devices and further includes a downstream smooth deflecting roll.
The axes of the rolls la and 2a are arranged parallel to one another, are rotatably mounted and define a roll :' ' - -~ ' - 8 - J i i gap 3a for passage of the paper web 4a. The two rolls -~
la and 2a are driven in opposite directions.
Application units 5a and 6a for applying a free-flowing medium onto the rolls are arranged on the sides of the rolls la and 2a, respectively, near a part of each roll circumference which travels from the ~ ~
bottom toward the top of the respective roll. The ~ -paper web 4a is guided from the top to the bottom of the rolls la and 2a through the roll gap 3a. In regions 7a and 8a, which form the roll gap 3a with the paper web 4a, a film of free-flowing medium i9 applied onto the paper web 4a.
The elements la - 9a illustrated in Fig. 2a are substantially identical in structure and function to the elements 1 - 9, respectively, described herein with respect to Fig. 1. However, both of the application units 5a and 6a apply a coating onto a surface of the rolls la and 2a, respectively. As a result of guiding the paper web 4a from top to bottom through the roll gap 3a, a coating composition i~
applied onto both sides of the paper web 4a in a desired thickne g.
In a downstream section 9a of the apparatus shown in Fig. 2a, spreading devices illustrated as spreading rods lOa are disposed on both sides of the paper web 4a to spread the coating composition thereon.
The spreading rods lOa have a symmetry similar to the devices 10 described with respect to Fig. 1. The surface of each rod lOa can be smooth and each rod preferably has a diameter of between about 10 mm and about 30 mm. Each rod lOa may have a wire wrapped therearound to provide a contoured rod surface.
The rods; lOa do not rotate. In order to achieve good spreading effect, additional drive ~-35 possibiIities are provided (not shown in Fig. 2a) in ~ -order to achieve oscillating movements around the rod axis, as well as longitudinally or transversely with ~ -respect to the direction of movement of the paper web 4a. A combination of longitudinal and transverse movement of each rod lOa relative to the paper web 4a may also be provided.
9 ,.. i 1 '~
'~ According to the invention it is also possible to replace the rods lOa located on either side of the paper web 4a with the driven spreader rolls 10 described with respect to Fig. 1. -~
Preferably, the spreading rods lOa are ~ -arranged on both sides of the paper web in such a way that the rods lOa are evenly displaced with respect to one another in the direction of movement of the paper web 4a. In particular, the axis of a fir3t spreading device lOa may be di~posed in a first plane perpendicular to a tangent of the web 4a conveyed about the first spreading device lOa and the axis of the second spreading device lOa is disposed in a ~econd plane perpendicular to a tangent of the web 4a conveyed about the second spreading device lOa, with the first and second planes being parallel.
Downstream the rods lOa, the paper web 4a is guided further by contact with a deflection roll lla.
To avoid contact of a still wet or moist coated paper web 4a with the deflection roll lla a drying apparatus (not shown) may be provided between the deflection roll lla and the spreading device lOa.
An alternative-spreading device orientation according to the~invention is shown in Fig. 2b. The elements lb - 9b, and llb, of the apparatus shown in Fig. 2b are identical in structure, function and orientation to elements la - 9a, and lla, respectively, described herein with re~pect to Fig. 2a. Spreading ~-devices lOb shown in Fig. 2b are identical in function and structure to the spreading devices lOa described herein with respect to Fig. 2a. However, the axes of the spreading devices lOb shown in Fig. 2b are disposed in a common plane perpendicular to the direction of movement of the web 4b conveyed between the spreading 35 devices lOb. ~-Fig. 3a shows a modified two-roll press -according to the invention similar to what i described herein with respect to Fig. 2a having first and second rolls defining a roll gap for applying coating onto both sides of a paper web with spreading devices arranged on both sides of the paper web and including an air-cushioned deflection device and a subsequent infrared drying device.
Elements lc - lOc of the apparatus shown in Fig. 3a are identical in structure, function and orientation to elements la - lOa, respectively, described herein with respect to Fig. 2a. The spreading device~ or rods lOc can be designed as rods described with respect to Figs. 2a and 2b or as driven spreader rolls as described with respect to Fig. 1.
having the drive possibilities already described with respect thereto.
The apparatus shown in Fig. 3a is equipped with an air-cushion deflecting device llc so that the paper web 4c i~ deflected without contact to a deflection roll or any other element of the device.
The advantage of this is that paper webs which still contain moist coating can be deflected with a deflecting device without direct contact with the side of the paper web that still contains moist coating and thus prior intermediate drying is not required. Then the paper web 4c i~ dried u~ing an infrared device 12c.
Another possibility of subsequent drying is shown in Fig. 3b. An apparatus according to the invention shown in Fig. 3b includes a two-roll press --defining a roll gap for applying coating onto both sides of a paper web with spreading devices disposed on both sides of the paper web, an air-cushioned deflection device and a sub~equent infrared and suspension drying device.
The elements ld - 12d of the apparatus shown in Fig. 3b are identical in structure, function and orientation to the elements lc - 12c, respectively, -described herein with respect to Fig. 3a.
Additionally, the apparatus shown in Fig. 3b includes a suspension dryer 13 downstream of the infrared drying device 12d.
The two-roll press shown in Fig. 4 corresponds in construction and function essentially to the embodiment shown in Fig. 2 and includes first and second roll~ defining a roll gap for applying coating onto both sides of a paper web with rods arranged on both sides of the paper web, spreading devices each having a convex working surface for contacting a coated paper web and a downstream smooth deflecting roll.
The elements le - 9e of the apparatus shown in Fig. 4 are identical in structuxe, function and orientation to the elements la - 9a, respectively, described herein with respect to Fig. 2a. Rods lOe which are u3ed as spreading devices have convex working surfaces lOf as viewed from the sides thereof. The rods lOe are also known as ~hydrobar shoes. n The radius of curvature of the working surface lOf of a rod lOe i9 preferably chosen to be larger than the radius of the rod lOe so that the effective working sur~ace of the spreading device is enlarged.
Hydrobar shoes having a working surface lOf can be stationary or can be equipped with an additional drive (not shown) to produce oscillating movements transverse to the direction of movement of the paper web 4e.
The surface lOf of a hydrobar shoe can be --smooth or contoured as shown in Figs. 5a - 5c and 6a -6c. Preferably, the contoured profile does not extend over the entire working surface lOf of the hydrobar -shoe, but only throughout a first ascending curved portion in the direction of movement of the paper web 4e. The subsequent de~cending part of the shoe is preferably smooth. AS a result, an initially uneven coating compo~ition covering the paper web will first be roughened and then uniformly spread by such a working surface lOf. Then the paper web 4e is introduced, for example, to a subsequent drying device or devices via a deflecting device lle.
Figs. 5a, 5b and 5c show possibilitie~ for 35 the design of the hydrobar shoe surface contour. The ~ -profile of the working surface shown in Fig. 5a i9 wavy. Figs. 5b and 5c show the possibility of using a tooth profile and a rack profile, respectively. ~-Figs. 6a, 6b and 6c show various po33ible profile contours from a top view of the surface lOf of the hydrobar shoe lCe. Parallel profile contours, - 12 - J i 1 ~ L~
-~ profile contours with a slope and profile contours with alternating slopes can be provided.
The selection of the spreading device or devices according to the invention to be used, their number (e.g. the possibilities of connecting spreading devices one after another on the 3ame side of the paper web), and the possibilities of operation are chosen for a each specific application and according to the effect to be achieved.
The foregoing detailed description is given for clearness of understanding only, an no unnecessary limitations should be understood therefrom, as modifications within the scope of the invention will be apparent to those skilled in the art.
Claims (16)
1. In an apparatus for coating free-flowing media onto a web of material including first and second rotatably mounted, oppositely driven rolls, each having an axis, the axes being disposed parallel to one another, said rolls defining a roll gap for the passage of a web therethrough and first and second application units cooperating with said first and second rolls, respectively, for applying a free-flowing medium onto a lateral surface of each of said rolls, the improvement comprising a spreading device disposed downstream of the roll gap with respect to the direction of travel of a web through the apparatus, said spreading device being disposed at at least one side of a web being conveyed through the apparatus and adapted to substantially contact the web across a width thereof.
2. The improvement of claim 1 wherein the first application unit applies a coating to the first roll and the second application unit applies sizing to the second roll and wherein the spreading device is disposed on the side of a web being conveyed through the apparatus having the coating applied thereon from the first roll.
3. The improvement of claim 1 wherein said first and second application units each apply a coating on the lateral surfaces of the first and second rolls, respectively, and wherein the spreading device comprises first and second spreading devices disposed on either side of a web being conveyed through the apparatus.
4. The improvement of claim 3 wherein the axis of the first spreading device is disposed in a first plane perpendicular to a tangent of a web conveyed about the first spreading device and the axis of the second spreading device is disposed in a second plane perpendicular to a tangent of a web conveyed about the second spreading device, said second plane being parallel to said first plane.
5. The improvement of claim 3 wherein the axes of the first and second spreading devices are disposed in a common plane perpendicular to the direction of movement of a web conveyed between the first and second spreading devices.
6. The improvement of claim 3 wherein the first and second spreading devices are evenly displaced with respect to one another with respect to the direction of movement of a web being conveyed through the apparatus.
7. The improvement of claim 1 wherein the spreading device is rotationally symmetrical.
8. The improvement of claim 7 wherein the spreading device is rotatably mounted on the apparatus.
9. The improvement of claim 7 wherein the spreading device is driven.
10. The improvement of claim 9 wherein the rotational velocity of the spreading device is different from the velocity of a web being conveyed through the apparatus.
11. The improvement of claim 9 wherein the spreading device rotates in a direction opposite to the direction of movement of a web being conveyed through the apparatus.
12. The improvement of claim 1 wherein the spreading device is a rod having a convex working surface as viewed from a side thereof.
13. The improvement of claim 1 wherein the spreading device oscillates about an axis thereof.
14. The improvement of claim 1 wherein the spreading device oscillates transversely and/or longitudinally with respect to the direction of movement of a web being conveyed through the apparatus.
15. The improvement of claim 1 wherein the spreading device has a smooth working surface for contacting a web.
16. The improvement of claim 1 wherein the spreading device has a substantially contoured working surface for contacting a web.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19934302435 DE4302435A1 (en) | 1993-01-29 | 1993-01-29 | Paper web coating appts. - has smoother against side of web in free path after leaving gap between applicator rollers |
| DEP4302435.1 | 1993-01-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2114464A1 true CA2114464A1 (en) | 1994-07-30 |
Family
ID=6479162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2114464 Abandoned CA2114464A1 (en) | 1993-01-29 | 1994-01-28 | Device for coating free-flowing media onto a moving web |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0610574A1 (en) |
| JP (1) | JPH07204555A (en) |
| CA (1) | CA2114464A1 (en) |
| DE (1) | DE4302435A1 (en) |
| FI (1) | FI940358A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5830275A (en) * | 1994-05-04 | 1998-11-03 | Voith Sulzer Papiermaschinen Gmbh | Paper coating apparatus |
| US6699362B1 (en) | 1999-05-12 | 2004-03-02 | Metso Paper, Inc. | Method for the manufacture of paper, and paper machine line |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4243518C2 (en) * | 1992-12-22 | 1996-03-28 | Feldmuehle Ag Stora | Devices for applying liquid to both sides of a material web and method for applying a liquid to a material web with these devices |
| DE4420242A1 (en) * | 1994-06-10 | 1995-01-05 | Voith Gmbh J M | Equipment for the alternative treatment of a running web |
| DE29511088U1 (en) * | 1995-07-08 | 1995-09-14 | Voith Sulzer Papiermasch Gmbh | Device for producing a coated material web |
| DE29702629U1 (en) * | 1997-02-15 | 1997-04-10 | Voith Sulzer Papiermasch Gmbh | Device for the indirect application of liquid medium on one or both sides to a running web |
| DE19751697A1 (en) * | 1997-11-21 | 1999-05-27 | Voith Sulzer Papiertech Patent | Device for the indirect application of a liquid or pasty medium to a material web, in particular made of paper or cardboard |
| DE19800954A1 (en) * | 1998-01-13 | 1999-07-15 | Voith Sulzer Papiertech Patent | Device for direct or indirect application of a liquid or pasty application medium to a running material web, in particular made of paper or cardboard |
| DE10126365A1 (en) * | 2001-05-30 | 2002-12-05 | Voith Paper Patent Gmbh | To coat a moving paper/cardboard web on both sides, a coating is applied indirectly to one side to give a shallow penetration depth, and coated indirectly on the other side with a greater penetration depth |
| DE102009003065A1 (en) | 2009-05-13 | 2010-11-18 | Voith Patent Gmbh | Device for single or double side coating of a fluid to pasty coating medium on a running paper-, cardboard- or other fiber material web during its production and/or finishing process, comprises support elements |
| CN105665230B (en) * | 2016-04-01 | 2017-10-13 | 马鞍山联洪合成材料有限公司 | A kind of damping fin barrier paper glue spreading apparatus and glue spreading method |
| EP3479908A1 (en) * | 2017-11-03 | 2019-05-08 | A & R Carton OY | Method of and coating application unit for applying a coating on a web of material |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2334102A (en) * | 1940-08-26 | 1943-11-09 | Dow Chemical Co | Coating equipment |
| US3203392A (en) * | 1961-06-27 | 1965-08-31 | Du Pont | Freely supported rod for smoothing coating composition applied to webs |
| DE1804824A1 (en) * | 1968-10-24 | 1970-05-27 | Ind Technik Plastikmaschinen G | Artificial leather prodn |
| GB2057302A (en) * | 1978-02-14 | 1981-04-01 | Carnation Co | Sensitizing screen process film |
| DE8414413U1 (en) * | 1984-05-11 | 1987-11-19 | J.M. Voith Gmbh, 7920 Heidenheim, De | |
| DE3417487A1 (en) * | 1984-05-11 | 1985-11-21 | J.M. Voith Gmbh, 7920 Heidenheim | DEVICE FOR APPLYING A LIQUID ON A RUNNING TRAIN |
| DE3725893C1 (en) * | 1987-08-05 | 1988-12-15 | Voith Gmbh J M | Process and device for coating and for smoothing the coating |
| DE3934418A1 (en) * | 1989-10-14 | 1991-04-18 | Voith Gmbh J M | RAKEL |
-
1993
- 1993-01-29 DE DE19934302435 patent/DE4302435A1/en not_active Withdrawn
- 1993-12-11 EP EP93120015A patent/EP0610574A1/en not_active Withdrawn
-
1994
- 1994-01-25 FI FI940358A patent/FI940358A/en not_active Application Discontinuation
- 1994-01-28 CA CA 2114464 patent/CA2114464A1/en not_active Abandoned
- 1994-01-31 JP JP1008994A patent/JPH07204555A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5830275A (en) * | 1994-05-04 | 1998-11-03 | Voith Sulzer Papiermaschinen Gmbh | Paper coating apparatus |
| US6699362B1 (en) | 1999-05-12 | 2004-03-02 | Metso Paper, Inc. | Method for the manufacture of paper, and paper machine line |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0610574A1 (en) | 1994-08-17 |
| JPH07204555A (en) | 1995-08-08 |
| FI940358A0 (en) | 1994-01-25 |
| DE4302435A1 (en) | 1993-08-12 |
| FI940358A (en) | 1994-07-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 19980128 |