CA2113940A1 - Size press and method for coating a web therein - Google Patents
Size press and method for coating a web thereinInfo
- Publication number
- CA2113940A1 CA2113940A1 CA002113940A CA2113940A CA2113940A1 CA 2113940 A1 CA2113940 A1 CA 2113940A1 CA 002113940 A CA002113940 A CA 002113940A CA 2113940 A CA2113940 A CA 2113940A CA 2113940 A1 CA2113940 A1 CA 2113940A1
- Authority
- CA
- Canada
- Prior art keywords
- nip
- roll
- web
- size
- press
- 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
Abstract
ABSTRACT
A size press arrangement including a first roll mounted rigidly on a frame of the size press and a second roll which forms a size-press nip with the first roll. The second roll is mounted at a level higher than the level of the first roll and, on a loading arm that is supported pivotally on a transverse shaft on the frame of the size press. The loading arm is pivoted by loading cylinders so as to produce a desired pressure level in the nip and to open the nip for threading of the web and for replacement of rolls. The paper web is passed into the nip as guided by a guide roll and out of the nip over a spreader roll or an air-turning device. The rolls that form the size-press nip are arranged in relation to one another such that the nip plane passing through the rolls forms an angle of from about 35° to about 120°, advantageously from about 50° to about 60°, preferably 55°, in relation to the horizontal plane. The web is passed into the nip at an angle of substantially about 90° in relation to the nip plane and to be passed out of the nip at an angle of about 90° ? 7° in relation to the nip plane.
A size press arrangement including a first roll mounted rigidly on a frame of the size press and a second roll which forms a size-press nip with the first roll. The second roll is mounted at a level higher than the level of the first roll and, on a loading arm that is supported pivotally on a transverse shaft on the frame of the size press. The loading arm is pivoted by loading cylinders so as to produce a desired pressure level in the nip and to open the nip for threading of the web and for replacement of rolls. The paper web is passed into the nip as guided by a guide roll and out of the nip over a spreader roll or an air-turning device. The rolls that form the size-press nip are arranged in relation to one another such that the nip plane passing through the rolls forms an angle of from about 35° to about 120°, advantageously from about 50° to about 60°, preferably 55°, in relation to the horizontal plane. The web is passed into the nip at an angle of substantially about 90° in relation to the nip plane and to be passed out of the nip at an angle of about 90° ? 7° in relation to the nip plane.
Description
~11394`~
8~Z2 PR~BB AND ~T~OD FOR COATIN~ ~ W~ TH~R~IN
BA~ROUND OF ~a~ INV~NTION
The present invention relates to a size press, comprising a first roll which is mounted ~igidly on the frame of the size press, and a second roll which forms a size-press nip with the fir~t roll.
The second roll is mounted at a level higher than the level of the first roll and on a pivotable loading arm that is supported on a transverse shaft of the frame of the size press. The rolls that form the size-press nip are provided with coating devices, e.g., of the short-dwell type, for spreading films of coating agent onto faces of the rolls. The coating agent is transferred from the roll faces in the nip, and adheres to the paper web or equivalent that passes through the nip. The loading arm is pivoted by means of loading cylinders so as to produce the desired pressure level in the nip and to open the nip for threading the web and for replacement of the rolls, when needed. The paper web or equivalent is guided by a guide roll and passed into the nip and is passed out of the nip over a spreader roll or an air-turning device. A method for coating a paper web using the size-press is also described.
An important objective of the surface sizing of paper is, in view of improving the printing qualities of the paper, to increase - the bonds between the fibers by using binding agents soluble in water, most commonly starch. The surface-treatment device most commonly used in s~rface sizing is a size press. A typical prior art size press comprises size press rolls mounted in a conventional way on the frame of the press and which form a nip with one another 21~3~
such that the paper web is passed through the nip. In a conventional mode of adding size to the paper face, a size pond is arranged in a gap placed before the nip and formed by the rolls such that the paper web runs through the pond. The web is guided by a guide roll and introduced into the nip so that the web is guided into the nip in the direction of the tangent of each press roll as precisely as possible.
A further development of the prior art size presses that make use of the size pond principle consists of film-size presses in which each roll in the size press is provided with a coating device, preferably of the short-dwell type. This type of devics spreads and smoothes a size film, or equivalent, onto the roll faces. The films on the roll faces are then transferred in the roll nip to the paper web to be treated. In addition to surface sizing, such film-size presses may also be used for the pigmenting of paper.
It is a conventional construction in size presses that a lower one of the size press rolls that form the size-press nip is mounted on the size-press frame in a stationary position, whereas the other roll, i.e., the upper size-press roll, is mounted on a particular pivotable loading arm which is linXed on the frame of the size press. Between the size-press frame and the loading arm, loading cylinders are arranged, by whose means the desired nip pressure can be produced in the size-press nip. Also, by means of the cylinders, the nip can be opened for tail threading of the web and further, for replacement of the rolls. In the size presses operating with the size-pond principle, the size-press rolls are usually arranged so that the plane that passes through the axes of the rolls, i.e., the nip plane, is substantially horizontal or only slightly inclined from the horizontal plane. By means of such an arrangement in which the nip plane is substantially horizontal, it is possible to form a suitable size pond in the gap placed before - 2~394~
the roll nip.
The film size presses that have been developed further from these size presses operating with the size-pond principle, and in which the size-press rolls are provided with particular coating devices, have a substantially similar, basic construction in the conventional technology. Thus, also in these prior art film-size presses, the size-press rolls are arranged so that the angle between the rolls, i.e., the angle of the nip plane in relation to the horizontal plane, is very small, generally of an order of only from about 15 to about 30O. One such device is described, e.g., in the assignee's Finnish Patent No. 87,475 of earlier date. In the device shown in FI 87,475, the paper guide roll, over which the web is passed into the nip, is arranged above the lower size-press roll. The lower size-press roll is attached to a pivot arm which is linked pivotally on the frame of the size press by ~eans of a transverse pivot shaft so that, for replacement of the roll, the paper guide roll can be pivoted into a position that has been shifted aside from the running position. One particular drawback of such a device is the complicated construction, and, as a result of this, a comparatively high cost.
Ordinarily, the paper guide roll is attached to a frame of its own, which is separate from the frame of the size-press rolls.
Owing to the relative location of the size-press rolls, it has been necessary to construct the frame of the paper guide roll to be quite massive, because it is necessary to support the paper guide roll above the size press. It has also been necessary to support the paper guide roll above the size press in order that it should be possible to make the web pass into the nip parallel to the tangent of each press roll as precisely as possible. In such an embodiment, it has not been possible to attach the paper guide roll to its frame directly, but generally, it has been attached by means of an articulated pivot arm linked to the frame construction in -2113~4 3 order to facilitate the lifting of the guide roll out of the way when replacing the press rolls. Thus, in these prior art devices, it is a problem that they require a considerable amount of space both in the machine direction and in the vertical direction, in view of the pivoting of the quide roll. ~uring pivoting or lifting of the guide roll, the paper guide roll and its pivot arm rise to a very high level, which is, in connection the prior art devices, a factor determining the height of the paper mill hall.
Owing to the fact that the angle of the nip plane of the size-press rolls in relation to the horizontal plane has been verylittle in prior art devices, i.e., of an order of only from about 15~ to about 30, it has been necessary to pass the web out of the nip so that the web follows the face of the upper roll over some distance. This has resulted in a significant drawback in that the web is separated from the upper roll indefinitely, and often causes so-called "web-stealing", i.e., a tendency of the web to follow the lower roll. This produces a fluttering movement in the web as the web is alternatingl~ separated from, and adheres to, the lower roll. This has had the consequence, especially in pigmenting processes, that the quality of the coating applied to the web has deteriorated, and a fully even coating is not produced.
In view of improving the web separation properties, in some cases, air-blow boxes have been used underneath the size press rolls in an attempt to separate the web from the faces of the size-press rolls by means of the air jets being directed from the air-blow boxes. Since the air-blow boxes are placed underneath the size-press rolls, contamination of the air-blow boxes has, however, constituted quite an significant drawback. The eame drawback al~o applies to the web guide roll placed underneath the nip. In particular in the case of pigmenting processes, for reasons of guality, it would be optimal if the web could be taken out of the nip at an angle of about 90 in relation to the nip plane. In such ~. : . , , : :
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a case, the quality of the coating would become as good as possible.
Further, it is a drawback of the prior art devices tha* the size-press rolls have a different hardness, i.e., the lower size-press roll and the upper size-press roll are provided with coatings of different hardness. This emanates from the fact tha*, after ~he nip, the web initially follows the upper roll and, nevertheless, a*tempts to adhere to the lower roll. In the prior art, the upper size-press roll has generally been harder than the lower roll.
Thus, for the size press, it has been necessary to keep spare rolls of two types in stock, i.e., some for replacement of the upper roll and others for the replacement of the lower roll. This drawback has constituted quite an important cost factor, and in some cases also results in a problem of the space needed to store a sufficient supply of both types of rolls.
O~JBCT~ AND B~NARY OF T~B INY~NTION
Accordingly, it is an object of the present invention to provide a new and improved size press by whose means the drawbacks associated with the prior art devices are substantially eliminated.
It is another object of the present invention to provide a new and improved size press by whose means the coating result can be improved over that obtained by the prior art devices.
It is yet another object of the present invention to provide a new and improved size press in which two size-press rolls having a substantially equal hardness can be utilized.
In view of achieving the objects stated above, and others, in the present invention, the pair of rolls that form the size-press nip are arranged in such a way in relation to one another that the nip plane passing through the rolls ~orms an angle o from about 35 to about 120, preferably from about 50 to about 60, in relation to the horizontal plane. The web is arranged to be passed .. : .
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into the nip at an angle of substantially about 9o in relation to the nip plane and to be passed out of the nip at an angle of substantially about 90 in relation to the nip plane.
By means of the present invention, compared with the prior art device, a number of advantages are obtained, of which, e.g., the following should be mentioned in this connection. In the present invention, the running line of the web can be made very smooth, which results in easy tail threading and good runnability of the web. The web can be separated from the nip at an angle of about 90 without any extra support members, such as air-blow boxes or equivalent. In connection with the present invention, it is, however, possible to use such support members if they are considered necessary, or desired.
AB the web is passed out of the nip substantially at an angle of about gOc, the quality of the coating is very good, in comparison to the coating results of the prior art arrangements. ~ ;~
In a size press in accordance with the present invention, it is possible to use rolls of equal hardness, unlike the prior art devices in which the one-sided separation of the web required rolls of different hardness. Thus, for the size press of the present invention, a lower number of spare rolls are needed than in the -prior art devices. The present invention enables the paper guide roll that precedes the nip to be mounted on a separate, stationary frame so that it does not hamper the replacement of the nip rolls in any way. In the size-press in accordance with the present invention, the nip is constructed to be opened in two stages so that the first open position is a normal tail threading position, whereas the second open position is a roll replacement position.
In this manner, the lower nip roll can be replaced even if the upper roll remains in its position.
It is a further advantage of the present invention that it is possible to minimize the entire space that is required by the size ,'.;;.,", ~ : ~; :
211394 ~
press in the longitudinal direction of the machine, i.e., in the machine direction.
In the method for coating a paper web in a size press in accordance with the present invention, a first roll is arranged on a frame of the size press and a second roll is arranged to form a size-press nip with the first roll ~uch that a nip plane between the first and second rolls forms an angle of from about 35 to about 120~ in relation to a horizontal plane. Coating devices are arranged to spread a film of coating agent onto faces of the first and second rolls. The paper web is passed through the nip such that the coating agent is transferred in the nip from the faces of the first and second rolls to the paper weh. The web is passed into the nip at an angle of substantially about 90 in relation to the nip plane, and guided out of the nip at an outlet angle of lS substantially about goo in relation to the nip plane. The second roll may be mounted on a loading arm which is supported on a transverse shaft on the frame. Loading cylinders are then arranged to pivot the loading arm to produce the deeired pressure level in the nip, to open the nip for threading of the web and for replacement of the rolls, when needed. The outlet angle is adjusted by means of a spreader roll or an air-turning device.
Further advantages and characteristic features of the invention will come out from the following detailed description of the invention with reference to the accompanying drawings.
BRIEF DE8CRIPTION OF T~E DRA~ING8 The following drawings are illustrative of embodiments of the present invention and are not meant to limit the scope of the invention as encompassed by the claims.
Figure 1 is a fully schematic side view of a size press in accordance with the present invention and used in a method in accordance with the invention.
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Figure 2 is a schematic sectional view of a coating device of the short-dwell type used in the size press and method in accordance with the present invention.
Eigure 3 is a schematic illustration of the running of the web line in the size press and method in accordance with the present invention.
Figure 4 is an illustration corresponding to Fig. 1 of the size press having contact free dryers are arranged in the path of the web coming out of the dryer before the drying cylinder.
Figure 5 is a schematic illustration of a embodiment having air-turning devices arranged to turn, spread and guide the weh after the nip.
DETAILED DE~CRIPTION OF T~B INV~NTION
In Fig. 1, a size press in accordance with the present invention is denoted generally with reference numeral 10. The size press 10 compriseæ a size-press frame 11 which is mounted on a base B. Size-press rolls 12,16 are mounted on base B in a conventional way. A bearing housing 13 of the first size-press roll 12, i.e., the lower roll, is mounted directly on the frame 11 of the size press and preferably attached to it rigidly. Bearing housing 17 of the second size-press roll, i.e., the upper roll, is mounted on a loading arm 19 which is linked pivotally to the size-press frame 11 - by means of a pivot shaft 20 arranged transverse to the machine direction. Loading cylinders 22 are arranged between the loading arm 19 and the size-press frame 11, by whose means the loading arm 19 is loaded so as to produce a nip pressure of the desired magnitude in the nip N formed by the lower roll 12 and the upper roll 16. Either one of the size-press rolls 12,16, preferably the upper roll 16, or alternatively both of the size press rolls 12,16, may be variable-crown rolls so that the pressure in the nip N can be brought to a desired level in the transverse direction of the ~3~4~1 machine.
Each size-press roll 12,16 is provided with a coating device 15,21, e.g~, of the short-dwell type, by whose means size films, or equivalent coating-agent films, are applied andismoothed onto faces 14,18 of the rolls 12,16, respectively. When the web W runs through the nip N, the films of coating agent are transferred from the faces 14,18 of the roll 12,16 to the web W', i.e., the coated web. The uncoated web W is passed into the size-pre6s nip N over a guide roll 23 which is mounted on a stationary frame 24 installed on the base B. After the size-press nip N, the coated web ~' is passed over a spreader roll 25 and further to the dryer section, whose first drying cylinder is denoted with reference numeral 26.
The construction and the operation of the coating devices 15,21 of the short-dwsll type are described in more detail in the description related to Fig. 2. The means of support of the spreader roll 25 are not described in more detail in this application; however, any known roll support means can be utilized.
Fig. 2 is a more detailed schematic sectional view of the construction of one specific coating device of the short-dwell type used in a size press in accordance with the present invention.
Other short-dwell coating devices may also be applied in accordance with the present invention. Fig. 2 shows the coating device lS of the short-dwell type placed in connection with the first size-press - roll 12 in the size press 10. It is obvious that the coating device 21 placed in connection with the second size-pxess roll 16 may have a construction of a corresponding or related type. In the coating device 15 in accordance with the invention, as is also the case in coating devices of the short-dwell type in general, the application of the coating-agent film onto the face 14 of the roll 12 is carried out so that, in the coating device 15, the coating agent is supplied preferably under pressure, into a coating-agent chamber 153. Coating agent chamber 153 is defined by a coating member 151, a front edge 152 of the coating-agent chamber 153, the face 14 of the size-press roll, and lateral seals (not shown).
The front edge 152 of the pressurized coating-agent chamber 153 may be similar to that shown in Fig. 2, so that the front edge 152 rests against the roll face 14. Alternatively, there may be a gap between the front edge 152 of the coating-agent chamber and the roll face 14, through which overflow of the coating agent passes from the coating-agent chamber 153 into a collecting basin.
In the embodiment shown in Fig. 2, the coating member that is used is a coating bar 151 which is mounted rotatably in a bar cradle 154, made of, e.g., polyurethane or an equivalent material.
The bar cradle 154 is mounted in a holder 155 and is secured in its position by a fastening device 156. A profile rib 158 is arranged behind the bar cradle 154 of the coating member, which rests against the rear face of the bar cradle 154 by the intermediate of a loading hose 157, i.e., the loading hose 157 is interposed between the profile rib 158 and the bar cradle 154. Adjusting spindles 159 are fixed to the frame of the coating device 15, by means o~ suitable fixing means (not shown). A number of such spindles are arranged to be uniformly spaced in the transverse direction of the machine. For each adjusting spindle 159, preferably spindle motors (not shown) are mounted on the frame of the coating device 15. By displacing the adjusting spindles 159, - the profile bar 158 is pulled and/or pushed so that the pro~ile bar 158 can be deflected as desired to coat the face 14 of the roll 12 in the desired way.
The coating device 15 as shown in Fig. 2 is provided with a coating-agent supply pipe 161 arranged transverse to the machine direction. The coating agent is supplied into the pipe 161 from one end or, preferably, from both ends of the supply pipe 161. The supply pipe 161 is provided with a large number of holes or equivalent nozzles 162 in the transverse direction of the machine.
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~he holes or nozzles 162 form a throttle for the flow of the coating agent. Thus, the coating agent is passed out of the supply pipe 161 through the nozzles 162 and into the coating-agent chamber 153. The front edge 152 of the coating-agent chamber 153 is installed in its holder 160 in a conventional manner. Other means to supply and apply coating agent onto the face 14 of the roll 12 may also be used in the present invention.
The embodiment æhown in Fig. 2 is one example of a coating device 15 of the short-dwell type used in a size press 10 in accordance with the present invention. Other constructions of the coating device may show even considerable variation within the scope of the invention. It is a common feature of the coating devices 15 of the short-dwell type that the device comprises a pressurized coating-agent chamber 153, which is defined by the 15coating member 151, the front edge 152 of the coating agent chamber, the roll face 14, and lateral seals (not shown).
In the following, in addition to Figs. 1 and 2, reference is also made to Fig. 3. As shown in Fig. 1 and especially in Fig. 3, the size-press rolls 12,16 are mounted in the size press in a 20manner different from the conventional arrangement, so that the angle a of the nip plane T-T, which runs through the central axes of the size press rolls 12,16, in relation to the horizontal plane S is substantially larger than in the prior art devices. In the present invention, the angle ~ is in a range from about 35 to 25about 120, advantageously from about 50O to about 60~, preferably about 55. In contrast to the present invention, in the prior art devices, the angle of the nip plane in relation to the horizontal plane is smaller, generally of an order of only from about 15 to about 30.
30The web W is passed into the nip N guided by the guide roll 23, so that the web W is guided into the nip N substantially parallel to the tangent of each press roll 12,16 as precisely as -11- :' : : ~ ' ,. ':
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possible. Thus, the web W is passed into the nip N substantially at an angle of about 90D in relation to the nip plane T-T. The ; inlet angle of the web running line in relation to the nip plane is, in Fig. 3, denoted with reference character Bl.
In the embodiment of Fig. 3, the coated web W' is passed from the nip N over the spreader roll 25 to further processing. As 0 stated in the description above, especially in pigmenting proces es, it is preferable to pass the coated web W' out of the nip N as precisely as possible at an angle of about 90 in relation to the nip plane T-T. As shown clearly in the figures, in the i present invention this objective is achieved so that the coated web W' can be passed out of the nip N at an angle B2 which is about 90 + 7, i.e., there is a small allowance on both sides of 90. The variation in the outlet angle B2 of the web line is produced so that the position of the spreader roll 25 is adjustable in the vertical direction. This adjustability can be arranged in a simple way by conventional means. By means of the adjustability of the position of the spreader roll 25, it is possible to regulate the outlet angle A2 of the web line in relation to the nip plane T-T in the desired way. Such a need of adjustment may arise, for example, when the properties of the upper face and the lower face of the web W to be coated differ from one another, e.g., in respect of the porosity or smoothness desired. These properties of the web W
affect the adhesion between the web W and the faces 14,18 of the rolls 12,16, respectively.
The size press 10 shown in Fig. 4 is similar to that already described with reference to Fig. l. The embodiment shown in Fig.
4 differs from that shown in Fig. 1 in that the web W' is passed from the size-press nip N onto a first drying cylinder 26 in the dryer section. Before the drying cylinder 26 and after a spreader roll 35, the web W' is dried by means of contact-free dryers 36,37 arranged. Contact-free dryers suitable for this purpose are, for -~
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',: !' ~, 2~l3~4a example, convection dryers, infrared dryers and/or air dryers, such as hot-air blow dryers. Contact-free dryers 36,37 are advantageous and necessary, especially when large coating quantities are applied onto the web W' by means of the ~ize press 10. As shown in Fig. 4, dryer 36 is arranged to operate in an opposite direction to that of dryer 37, e.g., to thereby dry both ~ides of the web.
In Fig. 4, it is shown further that, in the guiding of the web W' onto the drying cylinder 26, air blowing by means of an air-turning device or an equivalent blow box 38 is used as an aid.
Blow box 38 is arranged after dryers 36,37.
The embodiment shown in Fig. 5 differs from that shown in Fig.
4 in that, in the embodiment of Fig. 5, the spreader roll 35 as shown in Fig. 4 has been completely substituted for by air-turning devices 38a,38b, by whose means the web W' is turned and guided onto the first drying cylinder 26 in the dryer section. In the embodiment of Fig. 5, it is shown further that air blows coming out of blow boxes 3~c,38d, or equivalent air-turning devices which provide a directed flow of air, are arranged to support the web W' and are directed at an angle to the running direction of the web.
In the embodiment of Fig. 5, it is also possible to use contact-free web W' dryers similar to those described in relation to Fig.
4. The air-turning devices 38a,38b,38c and 38d cooperate to turn the web in desired directions. -In a size press 10 constructed in the manner described above, rolls of equal hardness can be used as the upper and lower rolls 12,16. The rolls 12,16 can be provided with identical coatings, in which case a high number of spare rolls are not needed as were needed in the prior art devices in which the upper and lower rolls have different coatings.
Replacement of the rolls 12,16 can also be carried out in a simple way in a size press 10 in accordance with the present invention. As shown in particular in Figs. 1, 4 and 5, by pivoting .: . .
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the loading arm 19, the rolls 12,16 can be brought into a roll replacement position in which the lower roll 12 can also be replaced readily even if the upper roll 16 were in its position.
The nip N is prePerably constructed so that it is opened in two stages, so that, by means of the loading arm 19 and the loading cylinders 22, the upper roll 16 can be pivoted firet into a normal tail threading position, in which the tail threading of the web W
can be carried out very easily and simply because of the substantially straight web line. After the catches of the tail threading position (not shown) have been opened, the nip N can be opened to the roll replacement position.
The examples provided above are not meant to be exclusive.
Many other variations of the present invention would be obvious to those skilled in the art, and are contemplated to be within the scope of the appended claims.
8~Z2 PR~BB AND ~T~OD FOR COATIN~ ~ W~ TH~R~IN
BA~ROUND OF ~a~ INV~NTION
The present invention relates to a size press, comprising a first roll which is mounted ~igidly on the frame of the size press, and a second roll which forms a size-press nip with the fir~t roll.
The second roll is mounted at a level higher than the level of the first roll and on a pivotable loading arm that is supported on a transverse shaft of the frame of the size press. The rolls that form the size-press nip are provided with coating devices, e.g., of the short-dwell type, for spreading films of coating agent onto faces of the rolls. The coating agent is transferred from the roll faces in the nip, and adheres to the paper web or equivalent that passes through the nip. The loading arm is pivoted by means of loading cylinders so as to produce the desired pressure level in the nip and to open the nip for threading the web and for replacement of the rolls, when needed. The paper web or equivalent is guided by a guide roll and passed into the nip and is passed out of the nip over a spreader roll or an air-turning device. A method for coating a paper web using the size-press is also described.
An important objective of the surface sizing of paper is, in view of improving the printing qualities of the paper, to increase - the bonds between the fibers by using binding agents soluble in water, most commonly starch. The surface-treatment device most commonly used in s~rface sizing is a size press. A typical prior art size press comprises size press rolls mounted in a conventional way on the frame of the press and which form a nip with one another 21~3~
such that the paper web is passed through the nip. In a conventional mode of adding size to the paper face, a size pond is arranged in a gap placed before the nip and formed by the rolls such that the paper web runs through the pond. The web is guided by a guide roll and introduced into the nip so that the web is guided into the nip in the direction of the tangent of each press roll as precisely as possible.
A further development of the prior art size presses that make use of the size pond principle consists of film-size presses in which each roll in the size press is provided with a coating device, preferably of the short-dwell type. This type of devics spreads and smoothes a size film, or equivalent, onto the roll faces. The films on the roll faces are then transferred in the roll nip to the paper web to be treated. In addition to surface sizing, such film-size presses may also be used for the pigmenting of paper.
It is a conventional construction in size presses that a lower one of the size press rolls that form the size-press nip is mounted on the size-press frame in a stationary position, whereas the other roll, i.e., the upper size-press roll, is mounted on a particular pivotable loading arm which is linXed on the frame of the size press. Between the size-press frame and the loading arm, loading cylinders are arranged, by whose means the desired nip pressure can be produced in the size-press nip. Also, by means of the cylinders, the nip can be opened for tail threading of the web and further, for replacement of the rolls. In the size presses operating with the size-pond principle, the size-press rolls are usually arranged so that the plane that passes through the axes of the rolls, i.e., the nip plane, is substantially horizontal or only slightly inclined from the horizontal plane. By means of such an arrangement in which the nip plane is substantially horizontal, it is possible to form a suitable size pond in the gap placed before - 2~394~
the roll nip.
The film size presses that have been developed further from these size presses operating with the size-pond principle, and in which the size-press rolls are provided with particular coating devices, have a substantially similar, basic construction in the conventional technology. Thus, also in these prior art film-size presses, the size-press rolls are arranged so that the angle between the rolls, i.e., the angle of the nip plane in relation to the horizontal plane, is very small, generally of an order of only from about 15 to about 30O. One such device is described, e.g., in the assignee's Finnish Patent No. 87,475 of earlier date. In the device shown in FI 87,475, the paper guide roll, over which the web is passed into the nip, is arranged above the lower size-press roll. The lower size-press roll is attached to a pivot arm which is linked pivotally on the frame of the size press by ~eans of a transverse pivot shaft so that, for replacement of the roll, the paper guide roll can be pivoted into a position that has been shifted aside from the running position. One particular drawback of such a device is the complicated construction, and, as a result of this, a comparatively high cost.
Ordinarily, the paper guide roll is attached to a frame of its own, which is separate from the frame of the size-press rolls.
Owing to the relative location of the size-press rolls, it has been necessary to construct the frame of the paper guide roll to be quite massive, because it is necessary to support the paper guide roll above the size press. It has also been necessary to support the paper guide roll above the size press in order that it should be possible to make the web pass into the nip parallel to the tangent of each press roll as precisely as possible. In such an embodiment, it has not been possible to attach the paper guide roll to its frame directly, but generally, it has been attached by means of an articulated pivot arm linked to the frame construction in -2113~4 3 order to facilitate the lifting of the guide roll out of the way when replacing the press rolls. Thus, in these prior art devices, it is a problem that they require a considerable amount of space both in the machine direction and in the vertical direction, in view of the pivoting of the quide roll. ~uring pivoting or lifting of the guide roll, the paper guide roll and its pivot arm rise to a very high level, which is, in connection the prior art devices, a factor determining the height of the paper mill hall.
Owing to the fact that the angle of the nip plane of the size-press rolls in relation to the horizontal plane has been verylittle in prior art devices, i.e., of an order of only from about 15~ to about 30, it has been necessary to pass the web out of the nip so that the web follows the face of the upper roll over some distance. This has resulted in a significant drawback in that the web is separated from the upper roll indefinitely, and often causes so-called "web-stealing", i.e., a tendency of the web to follow the lower roll. This produces a fluttering movement in the web as the web is alternatingl~ separated from, and adheres to, the lower roll. This has had the consequence, especially in pigmenting processes, that the quality of the coating applied to the web has deteriorated, and a fully even coating is not produced.
In view of improving the web separation properties, in some cases, air-blow boxes have been used underneath the size press rolls in an attempt to separate the web from the faces of the size-press rolls by means of the air jets being directed from the air-blow boxes. Since the air-blow boxes are placed underneath the size-press rolls, contamination of the air-blow boxes has, however, constituted quite an significant drawback. The eame drawback al~o applies to the web guide roll placed underneath the nip. In particular in the case of pigmenting processes, for reasons of guality, it would be optimal if the web could be taken out of the nip at an angle of about 90 in relation to the nip plane. In such ~. : . , , : :
:, ...;
.,,., . ~ ~ .
;..'::
2~ 3~4~
a case, the quality of the coating would become as good as possible.
Further, it is a drawback of the prior art devices tha* the size-press rolls have a different hardness, i.e., the lower size-press roll and the upper size-press roll are provided with coatings of different hardness. This emanates from the fact tha*, after ~he nip, the web initially follows the upper roll and, nevertheless, a*tempts to adhere to the lower roll. In the prior art, the upper size-press roll has generally been harder than the lower roll.
Thus, for the size press, it has been necessary to keep spare rolls of two types in stock, i.e., some for replacement of the upper roll and others for the replacement of the lower roll. This drawback has constituted quite an important cost factor, and in some cases also results in a problem of the space needed to store a sufficient supply of both types of rolls.
O~JBCT~ AND B~NARY OF T~B INY~NTION
Accordingly, it is an object of the present invention to provide a new and improved size press by whose means the drawbacks associated with the prior art devices are substantially eliminated.
It is another object of the present invention to provide a new and improved size press by whose means the coating result can be improved over that obtained by the prior art devices.
It is yet another object of the present invention to provide a new and improved size press in which two size-press rolls having a substantially equal hardness can be utilized.
In view of achieving the objects stated above, and others, in the present invention, the pair of rolls that form the size-press nip are arranged in such a way in relation to one another that the nip plane passing through the rolls ~orms an angle o from about 35 to about 120, preferably from about 50 to about 60, in relation to the horizontal plane. The web is arranged to be passed .. : .
'.: ~: .
' , ~ ` .
:, : ' , :.:
2~13~'~ u~
into the nip at an angle of substantially about 9o in relation to the nip plane and to be passed out of the nip at an angle of substantially about 90 in relation to the nip plane.
By means of the present invention, compared with the prior art device, a number of advantages are obtained, of which, e.g., the following should be mentioned in this connection. In the present invention, the running line of the web can be made very smooth, which results in easy tail threading and good runnability of the web. The web can be separated from the nip at an angle of about 90 without any extra support members, such as air-blow boxes or equivalent. In connection with the present invention, it is, however, possible to use such support members if they are considered necessary, or desired.
AB the web is passed out of the nip substantially at an angle of about gOc, the quality of the coating is very good, in comparison to the coating results of the prior art arrangements. ~ ;~
In a size press in accordance with the present invention, it is possible to use rolls of equal hardness, unlike the prior art devices in which the one-sided separation of the web required rolls of different hardness. Thus, for the size press of the present invention, a lower number of spare rolls are needed than in the -prior art devices. The present invention enables the paper guide roll that precedes the nip to be mounted on a separate, stationary frame so that it does not hamper the replacement of the nip rolls in any way. In the size-press in accordance with the present invention, the nip is constructed to be opened in two stages so that the first open position is a normal tail threading position, whereas the second open position is a roll replacement position.
In this manner, the lower nip roll can be replaced even if the upper roll remains in its position.
It is a further advantage of the present invention that it is possible to minimize the entire space that is required by the size ,'.;;.,", ~ : ~; :
211394 ~
press in the longitudinal direction of the machine, i.e., in the machine direction.
In the method for coating a paper web in a size press in accordance with the present invention, a first roll is arranged on a frame of the size press and a second roll is arranged to form a size-press nip with the first roll ~uch that a nip plane between the first and second rolls forms an angle of from about 35 to about 120~ in relation to a horizontal plane. Coating devices are arranged to spread a film of coating agent onto faces of the first and second rolls. The paper web is passed through the nip such that the coating agent is transferred in the nip from the faces of the first and second rolls to the paper weh. The web is passed into the nip at an angle of substantially about 90 in relation to the nip plane, and guided out of the nip at an outlet angle of lS substantially about goo in relation to the nip plane. The second roll may be mounted on a loading arm which is supported on a transverse shaft on the frame. Loading cylinders are then arranged to pivot the loading arm to produce the deeired pressure level in the nip, to open the nip for threading of the web and for replacement of the rolls, when needed. The outlet angle is adjusted by means of a spreader roll or an air-turning device.
Further advantages and characteristic features of the invention will come out from the following detailed description of the invention with reference to the accompanying drawings.
BRIEF DE8CRIPTION OF T~E DRA~ING8 The following drawings are illustrative of embodiments of the present invention and are not meant to limit the scope of the invention as encompassed by the claims.
Figure 1 is a fully schematic side view of a size press in accordance with the present invention and used in a method in accordance with the invention.
:, ~: :: -2~ 1394~
Figure 2 is a schematic sectional view of a coating device of the short-dwell type used in the size press and method in accordance with the present invention.
Eigure 3 is a schematic illustration of the running of the web line in the size press and method in accordance with the present invention.
Figure 4 is an illustration corresponding to Fig. 1 of the size press having contact free dryers are arranged in the path of the web coming out of the dryer before the drying cylinder.
Figure 5 is a schematic illustration of a embodiment having air-turning devices arranged to turn, spread and guide the weh after the nip.
DETAILED DE~CRIPTION OF T~B INV~NTION
In Fig. 1, a size press in accordance with the present invention is denoted generally with reference numeral 10. The size press 10 compriseæ a size-press frame 11 which is mounted on a base B. Size-press rolls 12,16 are mounted on base B in a conventional way. A bearing housing 13 of the first size-press roll 12, i.e., the lower roll, is mounted directly on the frame 11 of the size press and preferably attached to it rigidly. Bearing housing 17 of the second size-press roll, i.e., the upper roll, is mounted on a loading arm 19 which is linked pivotally to the size-press frame 11 - by means of a pivot shaft 20 arranged transverse to the machine direction. Loading cylinders 22 are arranged between the loading arm 19 and the size-press frame 11, by whose means the loading arm 19 is loaded so as to produce a nip pressure of the desired magnitude in the nip N formed by the lower roll 12 and the upper roll 16. Either one of the size-press rolls 12,16, preferably the upper roll 16, or alternatively both of the size press rolls 12,16, may be variable-crown rolls so that the pressure in the nip N can be brought to a desired level in the transverse direction of the ~3~4~1 machine.
Each size-press roll 12,16 is provided with a coating device 15,21, e.g~, of the short-dwell type, by whose means size films, or equivalent coating-agent films, are applied andismoothed onto faces 14,18 of the rolls 12,16, respectively. When the web W runs through the nip N, the films of coating agent are transferred from the faces 14,18 of the roll 12,16 to the web W', i.e., the coated web. The uncoated web W is passed into the size-pre6s nip N over a guide roll 23 which is mounted on a stationary frame 24 installed on the base B. After the size-press nip N, the coated web ~' is passed over a spreader roll 25 and further to the dryer section, whose first drying cylinder is denoted with reference numeral 26.
The construction and the operation of the coating devices 15,21 of the short-dwsll type are described in more detail in the description related to Fig. 2. The means of support of the spreader roll 25 are not described in more detail in this application; however, any known roll support means can be utilized.
Fig. 2 is a more detailed schematic sectional view of the construction of one specific coating device of the short-dwell type used in a size press in accordance with the present invention.
Other short-dwell coating devices may also be applied in accordance with the present invention. Fig. 2 shows the coating device lS of the short-dwell type placed in connection with the first size-press - roll 12 in the size press 10. It is obvious that the coating device 21 placed in connection with the second size-pxess roll 16 may have a construction of a corresponding or related type. In the coating device 15 in accordance with the invention, as is also the case in coating devices of the short-dwell type in general, the application of the coating-agent film onto the face 14 of the roll 12 is carried out so that, in the coating device 15, the coating agent is supplied preferably under pressure, into a coating-agent chamber 153. Coating agent chamber 153 is defined by a coating member 151, a front edge 152 of the coating-agent chamber 153, the face 14 of the size-press roll, and lateral seals (not shown).
The front edge 152 of the pressurized coating-agent chamber 153 may be similar to that shown in Fig. 2, so that the front edge 152 rests against the roll face 14. Alternatively, there may be a gap between the front edge 152 of the coating-agent chamber and the roll face 14, through which overflow of the coating agent passes from the coating-agent chamber 153 into a collecting basin.
In the embodiment shown in Fig. 2, the coating member that is used is a coating bar 151 which is mounted rotatably in a bar cradle 154, made of, e.g., polyurethane or an equivalent material.
The bar cradle 154 is mounted in a holder 155 and is secured in its position by a fastening device 156. A profile rib 158 is arranged behind the bar cradle 154 of the coating member, which rests against the rear face of the bar cradle 154 by the intermediate of a loading hose 157, i.e., the loading hose 157 is interposed between the profile rib 158 and the bar cradle 154. Adjusting spindles 159 are fixed to the frame of the coating device 15, by means o~ suitable fixing means (not shown). A number of such spindles are arranged to be uniformly spaced in the transverse direction of the machine. For each adjusting spindle 159, preferably spindle motors (not shown) are mounted on the frame of the coating device 15. By displacing the adjusting spindles 159, - the profile bar 158 is pulled and/or pushed so that the pro~ile bar 158 can be deflected as desired to coat the face 14 of the roll 12 in the desired way.
The coating device 15 as shown in Fig. 2 is provided with a coating-agent supply pipe 161 arranged transverse to the machine direction. The coating agent is supplied into the pipe 161 from one end or, preferably, from both ends of the supply pipe 161. The supply pipe 161 is provided with a large number of holes or equivalent nozzles 162 in the transverse direction of the machine.
2-1 ~3~
~he holes or nozzles 162 form a throttle for the flow of the coating agent. Thus, the coating agent is passed out of the supply pipe 161 through the nozzles 162 and into the coating-agent chamber 153. The front edge 152 of the coating-agent chamber 153 is installed in its holder 160 in a conventional manner. Other means to supply and apply coating agent onto the face 14 of the roll 12 may also be used in the present invention.
The embodiment æhown in Fig. 2 is one example of a coating device 15 of the short-dwell type used in a size press 10 in accordance with the present invention. Other constructions of the coating device may show even considerable variation within the scope of the invention. It is a common feature of the coating devices 15 of the short-dwell type that the device comprises a pressurized coating-agent chamber 153, which is defined by the 15coating member 151, the front edge 152 of the coating agent chamber, the roll face 14, and lateral seals (not shown).
In the following, in addition to Figs. 1 and 2, reference is also made to Fig. 3. As shown in Fig. 1 and especially in Fig. 3, the size-press rolls 12,16 are mounted in the size press in a 20manner different from the conventional arrangement, so that the angle a of the nip plane T-T, which runs through the central axes of the size press rolls 12,16, in relation to the horizontal plane S is substantially larger than in the prior art devices. In the present invention, the angle ~ is in a range from about 35 to 25about 120, advantageously from about 50O to about 60~, preferably about 55. In contrast to the present invention, in the prior art devices, the angle of the nip plane in relation to the horizontal plane is smaller, generally of an order of only from about 15 to about 30.
30The web W is passed into the nip N guided by the guide roll 23, so that the web W is guided into the nip N substantially parallel to the tangent of each press roll 12,16 as precisely as -11- :' : : ~ ' ,. ':
.! ' : : , .' . . ' ' :':"' : . ' ~ ~.: . `
''. " : " , - 2~13~4~
possible. Thus, the web W is passed into the nip N substantially at an angle of about 90D in relation to the nip plane T-T. The ; inlet angle of the web running line in relation to the nip plane is, in Fig. 3, denoted with reference character Bl.
In the embodiment of Fig. 3, the coated web W' is passed from the nip N over the spreader roll 25 to further processing. As 0 stated in the description above, especially in pigmenting proces es, it is preferable to pass the coated web W' out of the nip N as precisely as possible at an angle of about 90 in relation to the nip plane T-T. As shown clearly in the figures, in the i present invention this objective is achieved so that the coated web W' can be passed out of the nip N at an angle B2 which is about 90 + 7, i.e., there is a small allowance on both sides of 90. The variation in the outlet angle B2 of the web line is produced so that the position of the spreader roll 25 is adjustable in the vertical direction. This adjustability can be arranged in a simple way by conventional means. By means of the adjustability of the position of the spreader roll 25, it is possible to regulate the outlet angle A2 of the web line in relation to the nip plane T-T in the desired way. Such a need of adjustment may arise, for example, when the properties of the upper face and the lower face of the web W to be coated differ from one another, e.g., in respect of the porosity or smoothness desired. These properties of the web W
affect the adhesion between the web W and the faces 14,18 of the rolls 12,16, respectively.
The size press 10 shown in Fig. 4 is similar to that already described with reference to Fig. l. The embodiment shown in Fig.
4 differs from that shown in Fig. 1 in that the web W' is passed from the size-press nip N onto a first drying cylinder 26 in the dryer section. Before the drying cylinder 26 and after a spreader roll 35, the web W' is dried by means of contact-free dryers 36,37 arranged. Contact-free dryers suitable for this purpose are, for -~
' ~
. : . :
',: !' ~, 2~l3~4a example, convection dryers, infrared dryers and/or air dryers, such as hot-air blow dryers. Contact-free dryers 36,37 are advantageous and necessary, especially when large coating quantities are applied onto the web W' by means of the ~ize press 10. As shown in Fig. 4, dryer 36 is arranged to operate in an opposite direction to that of dryer 37, e.g., to thereby dry both ~ides of the web.
In Fig. 4, it is shown further that, in the guiding of the web W' onto the drying cylinder 26, air blowing by means of an air-turning device or an equivalent blow box 38 is used as an aid.
Blow box 38 is arranged after dryers 36,37.
The embodiment shown in Fig. 5 differs from that shown in Fig.
4 in that, in the embodiment of Fig. 5, the spreader roll 35 as shown in Fig. 4 has been completely substituted for by air-turning devices 38a,38b, by whose means the web W' is turned and guided onto the first drying cylinder 26 in the dryer section. In the embodiment of Fig. 5, it is shown further that air blows coming out of blow boxes 3~c,38d, or equivalent air-turning devices which provide a directed flow of air, are arranged to support the web W' and are directed at an angle to the running direction of the web.
In the embodiment of Fig. 5, it is also possible to use contact-free web W' dryers similar to those described in relation to Fig.
4. The air-turning devices 38a,38b,38c and 38d cooperate to turn the web in desired directions. -In a size press 10 constructed in the manner described above, rolls of equal hardness can be used as the upper and lower rolls 12,16. The rolls 12,16 can be provided with identical coatings, in which case a high number of spare rolls are not needed as were needed in the prior art devices in which the upper and lower rolls have different coatings.
Replacement of the rolls 12,16 can also be carried out in a simple way in a size press 10 in accordance with the present invention. As shown in particular in Figs. 1, 4 and 5, by pivoting .: . .
,.. . ~
- 2~ 4~
the loading arm 19, the rolls 12,16 can be brought into a roll replacement position in which the lower roll 12 can also be replaced readily even if the upper roll 16 were in its position.
The nip N is prePerably constructed so that it is opened in two stages, so that, by means of the loading arm 19 and the loading cylinders 22, the upper roll 16 can be pivoted firet into a normal tail threading position, in which the tail threading of the web W
can be carried out very easily and simply because of the substantially straight web line. After the catches of the tail threading position (not shown) have been opened, the nip N can be opened to the roll replacement position.
The examples provided above are not meant to be exclusive.
Many other variations of the present invention would be obvious to those skilled in the art, and are contemplated to be within the scope of the appended claims.
Claims (18)
1. A size press in which a paper web is coated, comprising:
a frame, a first roll mounted on said frame, a second roll arranged on said frame and forming a size-press nip with said first roll, said first roll and said second roll being arranged in relation to one another such that a plane of the size-press nip between said first and second rolls forms an angle of from about 35° to about 120° in relation to a horizontal plane, guide means for directing the web into the nip at an angle of substantially about 90° in relation to the nip plane and for directing the web out of the nip at an outlet angle of substantially about 90° in relation to the nip plane, and coating devices arranged in connection with said first and second rolls for spreading a film of coating agent onto faces of said first and second rolls, the coating agent being transferred in the nip from the faces of said first and second rolls to the paper web that passes through the nip.
a frame, a first roll mounted on said frame, a second roll arranged on said frame and forming a size-press nip with said first roll, said first roll and said second roll being arranged in relation to one another such that a plane of the size-press nip between said first and second rolls forms an angle of from about 35° to about 120° in relation to a horizontal plane, guide means for directing the web into the nip at an angle of substantially about 90° in relation to the nip plane and for directing the web out of the nip at an outlet angle of substantially about 90° in relation to the nip plane, and coating devices arranged in connection with said first and second rolls for spreading a film of coating agent onto faces of said first and second rolls, the coating agent being transferred in the nip from the faces of said first and second rolls to the paper web that passes through the nip.
2. The size press of claim 1, wherein said second roll is arranged at a level higher than the level of said first roll.
3. The size press of claim 1, further comprising a pivotable loading arm on which said second roll is mounted, said loading arm being supported on a transverse shaft on the frame, loading cylinders arranged to pivot said loading arm so as to produce a desired pressure level in the nip and to open the nip for threading of the web and for replacement of the rolls, and said guide means comprising a guide roll for guiding the paper web into the nip, and one of a spreader roll and an air-turning device for guiding the paper web out of the nip.
4. The size press of claim 1, wherein the angle of the nip plane in relation to the horizontal plane is from about 50° to about 60°.
5. The size press of claim 1, wherein said outlet angle is adjustable at an allowance on both sides of 90°.
6. The size press of claim 5, wherein the allowance for adjustment of said outlet angle of the nip plane is ? about 7°.
7. The size press of claim 1, wherein said guide means comprises adjusting means to adjust said outlet angle.
8. The size press of claim 7, wherein said adjusting means comprise one of a spreader roll and an air-turning device arranged to adjust said outlet angle in a vertical direction.
9. The size press of claim 8, further comprising contact-free web dryers arranged in the path of the web after said adjusting means.
10. The size press of claim 9, wherein said contact-free web dryers are selected from the group consisting of convection dryers, infrared dryers and hot-air blow dryers.
11. The size press of claim 1, wherein the angle of the nip plane in relation to the horizontal plane is about 55°.
12. The size press of claim 3, further comprising a second frame on which said guide roll is mounted in a stationary position, said second frame being separate from said frame of said size press.
13. The size press of claim 1, wherein said first and second rolls comprise respective coatings which have substantially equal hardness.
14. A method for coating a paper web in a size press, comprising the steps of:
arranging a first roll on a frame of the size press, arranging a second roll to form a size-press nip with the first roll such that a nip plane between said first and second rolls forms an angle of from about 35° to about 120° in relation to a horizontal plane, passing a paper web through the nip, arranging coating devices for spreading a film of coating agent onto faces of said first and second rolls, and transferring the coating agent in the nip from the faces of said first and second rolls to the paper web.
arranging a first roll on a frame of the size press, arranging a second roll to form a size-press nip with the first roll such that a nip plane between said first and second rolls forms an angle of from about 35° to about 120° in relation to a horizontal plane, passing a paper web through the nip, arranging coating devices for spreading a film of coating agent onto faces of said first and second rolls, and transferring the coating agent in the nip from the faces of said first and second rolls to the paper web.
15. The method of claim 14, further comprising passing the web into the nip at an angle of substantially about 90° in relation to the nip plane, and guiding the web out of the nip at an outlet angle of substantially about 90° in relation to the nip plane.
16. The method of claim 14, further comprising mounting said second roll on a loading arm, supporting said loading arm on a transverse shaft on the frame, and arranging loading cylinders to pivot said loading arm to produce the desired pressure level in the nip, to open the nip for threading of the web and for replacement of rolls.
17. The method of claim 15, further comprising adjusting the outlet angle by means of one of a spreader roll and an air-turning device.
18. The method of claim 14, wherein said second roll is arranged such that the nip plane forms an angle of from about 50°
to about 60° in relation to the horizontal plane.
to about 60° in relation to the horizontal plane.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI930255A FI93044C (en) | 1993-01-22 | 1993-01-22 | The size press |
| FI930255 | 1993-01-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2113940A1 true CA2113940A1 (en) | 1994-07-23 |
Family
ID=8536867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002113940A Abandoned CA2113940A1 (en) | 1993-01-22 | 1994-01-21 | Size press and method for coating a web therein |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0608206B1 (en) |
| AT (1) | ATE141359T1 (en) |
| CA (1) | CA2113940A1 (en) |
| DE (1) | DE69400357T2 (en) |
| FI (1) | FI93044C (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4431202A1 (en) * | 1994-09-02 | 1996-03-07 | Jagenberg Papiertech Gmbh | Device for coating a material web on both sides |
| FI115543B (en) | 2000-06-20 | 2005-05-31 | Metso Paper Inc | Procedure for preliminary calendering, post-processing and apparatus for carrying out the processes |
| US6634120B2 (en) | 2001-03-26 | 2003-10-21 | Voith Paper Patent Gmbh | Apparatus for coating moving fiber webs |
| DE60129409T2 (en) * | 2001-03-26 | 2008-04-03 | Voith Patent Gmbh | Apparatus for coating a moving web, in particular a paper or board web |
| FI20045464A (en) | 2004-11-30 | 2006-05-31 | Metso Paper Inc | Process for making surface-glued paper / surface-glued cardboard |
| DE102008054948A1 (en) | 2008-12-19 | 2010-07-01 | Voith Patent Gmbh | Device for coating a fluid to pasty coating medium such as glue, starch or coating color on a side of a running paper, cardboard or other fiber material web, comprises two rotatable transfer elements or rotatable endless bands |
| DE102011002671A1 (en) | 2011-01-13 | 2012-07-19 | Metso Paper, Inc. | Glue supply system for supplying glue to a paper or board web |
| WO2013050821A1 (en) * | 2011-04-04 | 2013-04-11 | PMT Italia | A size press apparatus |
| DE102012213026A1 (en) | 2012-07-25 | 2014-01-30 | Voith Patent Gmbh | Device for treating moving paper, cardboard or other fibrous web, comprises applicator unit for applying application medium comprising e.g. glue and starch, coating unit for single-sided or double-sided coating, and pair of press rolls |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE427531C (en) * | 1926-04-09 | Bernhard Kremler | Device for gluing, dyeing and drawing paper webs in and outside the paper machine | |
| US3379170A (en) * | 1965-02-16 | 1968-04-23 | Appleton Mach | Liquid applicator |
| FI88063C (en) * | 1990-10-12 | 1993-03-25 | Valmet Paper Machinery Inc | Device for dosing of coating on a moving surface |
-
1993
- 1993-01-22 FI FI930255A patent/FI93044C/en active
-
1994
- 1994-01-21 DE DE69400357T patent/DE69400357T2/en not_active Revoked
- 1994-01-21 EP EP94850012A patent/EP0608206B1/en not_active Revoked
- 1994-01-21 AT AT94850012T patent/ATE141359T1/en not_active IP Right Cessation
- 1994-01-21 CA CA002113940A patent/CA2113940A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| FI93044B (en) | 1994-10-31 |
| DE69400357D1 (en) | 1996-09-19 |
| EP0608206B1 (en) | 1996-08-14 |
| ATE141359T1 (en) | 1996-08-15 |
| DE69400357T2 (en) | 1997-01-16 |
| EP0608206A1 (en) | 1994-07-27 |
| FI93044C (en) | 1995-02-10 |
| FI930255A0 (en) | 1993-01-22 |
| FI930255A (en) | 1994-07-23 |
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| Date | Code | Title | Description |
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| EEER | Examination request | ||
| FZDE | Discontinued |