JPH07505573A - Paper web coating method and apparatus - Google Patents

Abstract

The coating is applied at stations. Part of the total coating is applied at each station, and the sum of the coating stations equals the amt. of coating to be applied. The paper web is dried between each coating station. Pref. coating station which gives an indirect cladding action comprises two parallel rollers with a gap between them for the paper web to pass through. Applicator jet(s) is directed at the mantle surface of one roller for the coating medium to be transferred to the web at the roller gap. Each coating station delivers only part of the total coating, and a dryer is after each station. The total vol. of coating material is pref. initially applied to one side of the web, required for that side, and the web is dried. The amt. of coating required for the other side is then applied, and the web is dried again. With station(s) part of the coating is applied and the web is dried, and a further station where the remainder of the coating is applied and the web is dried again. The amt. of coating applied to each side of the web is more than 3 g/m2, e.g. 4-8 g/m2. After each coating, the web is dried to less than 70% of the dry rating. Each station is pref. a double coating station, with a jet directed at each roller mantle. Or each station is a single applicator station, with a jet directed at only one roller mantle. In the assembly, station(s) is a double unit and station(s) is a single applicator machine.

Description

[Detailed description of the invention] Paper web coating method and apparatus The present invention relates to a paper web coating method and apparatus. Method claims and equipment See the preamble to the claim.

The prior art is known from the publications listed below.

(1) German Utility Model Registration Publication No. 8414413 (2) U.S. Patent Publication No. 27 No. 29192 (3) U.S. Patent Publication No. 2946307 (4) U.S. Patent Publication No. 30 No. 84663 (5) 1 Weekly Newspaper 1973, pages 164 to 169 (6 ) Papermaking Weekly Newspaper 1978, pp. 773-778 (7) U.S. Patent Publication No. No. 5112653 The present invention starts from publication (1), in particular from FIG. 2 thereof.

In this case, two applicator rolls are provided and these applicator rolls are connected to each other. A gap is formed between them, and the paper web passes through the gap. Both applicator rolls have their own The nozzle coating equipment is arranged so that each coated film can be applied to the corresponding rotor. Apply on the outside surface of the ball. The nozzle applicator has two nozzle lips. one of their nozzle lips has a roll scraper at its free end. keeping. This is a rod that has a grooved outer surface. Therefore, applicable It is possible to apply a metered quantity of paint onto the outer surface of the roll. Therefore, this method The coating is first applied to the outer surface of the roll and from there transferred onto the paper web Therefore, it is an indirect application method.

Paper and carton production has already been used for several years, especially for sanitary papers and newsprint. Paper is used. In contrast, used paper for writing and printing has not been used until now. few.

The use of recycled paper is highly desirable since it is a semi-finished paper stock that is relatively cheap and available in large quantities. stomach. On the other hand, waste paper poses technical problems. One problem is the large amount of waste paper input. Due to the relatively low strength of paper, the problem with ponding is that waste paper naturally contains filth in the form of dust. , which is particularly a problem in offset printing presses. Coating containing waste paper The low strength of the base paper also manifests itself as discomfort during the coating process.

Coating paint means full coating! Contains high water content of approximately 50% of f=I .

During coating, most of this water penetrates into the paper, in which case its strength naturally decreases. Declines rapidly. Therefore, the risk of breakage due to this is greatly increased. 27m With the relatively small amount of paint represented by 2, a relatively small amount of water will penetrate the paper, so it will not be strong enough. degree reduction is acceptable. However, if the coating weight is about 5 g/m2 or more, The risk of rupture is greatly increased.

The second problem factor is the above-mentioned dust contamination tendency (S The second source of problems is the large number of possible commands. requires careful selection of coating method from coating method.

The problem of the present invention is that, especially when based on waste paper, low strength paper To provide a method and apparatus by which a web can be coated without risk of breakage. Based on.

This problem is solved by the features stated in the first method claim and the first device claim. resolved.

The present invention will be explained in detail with reference to the drawings. Both diagrams show two so-called on-machine components. 1 schematically shows an On-Machine-Coater. present invention Of course, it can also be used as an Off-Line Coater. It can also be used when

In FIG. 1, a number of drying cylinders are shown around which a paper web 2 is guided in a serpentine manner. It can be seen that the end region of the drying section has a The drying section has two rows, i.e. The drying section has a number of upper drying cylinders and lower drying cylinders, each of which has two cylinders. arranged in horizontal rows. As the paper web revolves around the individual drying cylinders, the It is wrapped like a sandwich between the outer surface of the drying cylinder and the drying sieve.

In the illustrated installation, the so-called soft-nip-calender C3of-Nip-C Next follows a smooth roll, which is implemented as an alender.

As can be seen, therefore, the paper web moves vertically downwards on the guide roller 4. The direction is changed. Thereto a series of further guide rollers 4.1.4, 2.4. 3.4.4 continues. Coating station for these guide rollers 5 is connected. The coating station 5 has two rolls 5. 1 and and 5 and 2. These rolls are arranged parallel to each other and roll against each other. A gap is formed through which the paper web 2 passes. Both roles are Roll 5.2 is arranged vertically above roll 5.1. roll 5 ．． 1 is equipped with a nozzle coating device 5.3 (according to German Utility Model Registration Bulletin No. 1). 81114413). This nozzle application device 5.3 is shown in detail in this figure. Two machine width nozzle lips (Duesen l1ppen) not shown have. In the direction of rotation of the rolls 5 and 1, the second nozzle lip is in the groove. It has a roll scraper having a smeared outer surface. This roll scraper dispenses a precise amount of paint onto the outer surface of the roll 5.1. The amount of this paint onto the incoming paper web 2 precisely in the gap between the rolls and, of course, on the negative side. transferred only to the side. A scraper 584 is arranged on the roll 5.2. So The paper web 2 coated on the face side passes through the nip of the rolls as follows. , guide rolls 451.16.4.7 and 4.8 are reached, in which case the paper web 2 passes through a drying station 6, for example. Furthermore, the pond guide roll is removed. This is then followed again by a mini-drying section 7 with a drying cylinder. And the second Two coating stations 8 are connected. This second coating step The system also has two rolls 8.1 and 82. to roll 8.1 Also arranged is a nozzle applicator 8.3, which is identical to the nozzle applicator 53. It is configured the same way. This gives the coating to the other side of the paper web. It will be done.

A further mini-drying group 9 and a winding device 10 are connected to this.

In this installation, in the method according to the invention, the coating is carried out in portions.

That is, in the first coating station 5, one side of the paper web is first completely coated and then in the second coating station 8 The other side of the paper web is coated. Therefore, the application of each paint respectively applied at the applicable coating station, it is also It is also the final paint mold weight of the surface. With this division of the coating process, Relatively small amounts of paper white are reached during the individual coating processes and therefore also It is guaranteed that the strength decrease will be relatively small. dry to coating process By connecting the process the intensity will quickly become high again. second coatin The new coating process is ruptured by suitable water seepage. such that the paper web has sufficient high strength by prior drying to overcome in position.

coated with a relatively large amount of waste paper and therefore has a relatively low initial strength. The printing base paper can be run in this way. In that case, the amount of paint applied is 8g/m Up to 2.

Furthermore, according to the invention, the paper web is provided with indirect application and the coating is rolled. The specified coating stage tongue, which is transferred from the outer surface of the roll onto the paper web, is used. It is important that In this case, the coating is already on the outer surface of the roll and its The scraping element is not applied to the paper web because the final thickness and quantity have been reached This is even more important. Selected coating stations that have an indirect application method In this case, the coated side of the paper web is completely sealed with paint. Completely covers dust and other particles that adhere to the surface in the case of waste paper-based papers guaranteed.

1a, 1b and 1c are further illustrative examples of the installation according to FIG. This fruit In the example, the spreader (!11 rub) element 20.1.20.2.203 respectively Or is provided. This can be used for large or small diameter round rods (Figure 18 or Figure 1 b) or if it is a rod with a non-circular cross section (Fig. 1c) good. The spreader element can either vibrate in its own longitudinal direction or in the direction of travel of the spreader, or around its own axis in the case of round spreader parts. Wear. Rotational photography is also possible. Their surfaces are very different, even be completely smooth, polished, grooved, or rotated. It is made from wire.

The installation illustrated in FIG. 2 is constructed similarly to the installation according to FIG. From this figure In addition, the ends of the two rows of cylinder drying sections 1, the smooth rolls 3, and the first The coating station 5, the dryer 6 connected next, and the drying cylinder (cylinder) a second coating station 8; A dryer 9 in the pond, a drying section 9.1 having a drying cylinder, and a take-up rotor. It turns out to be Rusten Yono 10.

Contrary to the installation according to FIG. 1, both coating stations 5 or 8 5. Two nozzle coating devices each. 1.5. 2 or 8.1 and 8.2 ing. This means that the paper web 2 is coated on both sides at each coating station. means that it can be targeted. Dry fi6 and 9 are empty An air dryer, this dryer holds the web free and then moves it to the next cylinder (series). (under) such dryness until the drying section 7 or 91 is accessible. (preferably at least 70% completely dry contents).

FIG. 28 shows a modified embodiment of FIG. In this case, first infrared drying 30 is installed, followed by a floating dryer vA (air dryer) 6.9. Ru.

The installation according to FIG. 3 differs from the installation according to FIG. 2 in the following respects: 5 is placed on one of both rolls of the coating station 5. It has only one coating station 51. This figure also shows the coatin. A spreader element 20.5 is connected after the cleaning station 5. coati The coating station 8 likewise has only one application stage tongue 8.1.

A spreader part 20.6 is connected afterwards. Therefore, each coat only one side at the printing station 5 or 8.

The basic concept of the split coating according to the invention with subsequent drying can be applied to various different It can be implemented using the following method. For example, initially only one side of the paper web is coated; It is then dried and then the other side of the paper web is coated and dried.

However, it is also possible to coat both sides of the paper web at the same time; Only in partial quantities.

Furthermore, it is possible to coat both sides at the same time, but one side Does the surface have a minimum amount of paint coverage and other surfaces have a relatively higher amount of paint coverage? However, this is still not the total amount of paint that should be applied to this surface.

Also, for example, it has -the partial amount fi (Teilgewicht) per surface. Simultaneous two-sided coating followed by further processing at the second coating station Application of one surface, with further application to completely cover the coating on one surface. This is followed by a third coating station application. Therefore, we can also consider a combination consisting of application that completes the coating on the second surface. It will be done. Appropriate drying equipment must be provided after each coating process. It goes without saying that this is a must. Selection of drying method and corresponding drying equipment The choice is left to the parties involved. Parties, e.g. infrared dryer, air supply A dryer or cylinder dryer can be used. In the example according to FIG. For example, dryers 6 and 9 are connected to the coating station and the cylinder dryer. It has a high drying capacity that eliminates the need for additional drying equipment between the dryer and the dryer. Ru.

4 and 11 schematically show possible relative arrangements applying the invention. Ru. In all these relative arrangements, the two coating stations are common. are doing. For clarity, only the important components of each relative position are detailed. is shown.

In the installation according to FIG. 4, the paper web passes through the first coating stage from below in the direction of the arrow. coating station 1, then a second coating station 2, a first infrared line course 3, second infrared course 4, floating web dryer 5 and finally drying section Sent to 6. In that case, the first coating station 1 comprises gluing or is useful for coloring or priming (pre-coating). This is the nozzle coating device 1. 1 first applies the coating to the applicator roll 1.2, then the coating It can be called an indirect coating method because the coating is transferred to the paper web.

In the second coating station 2, the paint is first applied to the first nozzle applicator. 2. 1 directly onto the paper web, and then a second nozzle coating device, in particular Application using an integral scraping plate during short residence times (so-called 5DTA-principle) do. In this structure, the first nozzle application device 2.1 also has a scraping plate 2.3. The second nozzle coating device 2.2, which is also It can be swiveled out to the side when necessary to prevent it from being damaged. This relationship is Similar to the case of the installation according to FIG. In this case, the first coating step An infrared drying unit is installed between the coating station 1 and the second coating station 2. 6 and a hot air drying unit 7 are inserted in between.

Figures 4a and 4b show an interesting variation.

The nozzle coating device 2l is described, for example, in "Voith Special Bulletin", page 2865 (199 It may be a so-called 5DTA as shown in FIG. 20 (November 2013).

This applicator is a bar-shaped scraping plate with a smooth or textured outer surface. but may also be a blade. In that case, the so-called /Yutif blade (stiff blade) J or "bent brake" Bent blade J can be considered.

The application device 2.1 can, however, also be used to coat the paper web as a "curtain" (so-called "fabric"). Fountain-Coating, tyyu cashier Any nozzle coating device that does not have a scraping element may be used for coating the paint. So Such a coating device is shown in FIG. 19 of the above-mentioned Voith Publication J.

In the embodiment according to FIG. 4b, the accuracy of the contact angle is determined before and after the coating station 1. For precise adjustment, guide rollers 15 and 16 are provided.

In coating station 1, even in the case of the embodiment according to FIG. Even in such embodiments, the opposite roll can be removed from use.

Particularly the structure of the nozzle, the roll lift, and the front and back as shown in Figures 4a and 4b. Features regarding the guide roller connected to the can also be present in all embodiments according to the invention.

In Stain=l/2, a roll coating device is also installed instead of the nozzle coating device 2l. It's okay to be kicked.

In the coating device 1, the so-called scraping in FIG. A coating fschleifen auftrag) can be provided on the roll 12. , in this case there is a speed difference between the web speed and the peripheral speed of the roll 1.2. this The speed difference is 0.1 times the web speed and 0.1 times in both directions. web and The contact angle with roll 12 is typically between 5 and 25 degrees.

In the installation according to FIG. 6, further parts are provided. coating stain Yo/1 is the second nozzle coating device, that is, the nozzle placed on roll l4. The coating amount [tl] is 3. Additionally, the side facing the drying devices 6 and 7 An infrared dryer FL8 is installed.

The installation according to FIG. 7 substantially corresponds to the installation according to FIG. But in this case are placed on both sides of the paper web, between both coating stations and 2, respectively. Infrared drying equipment and hot air drying equipment 6.1.62 and 7. ], 7°2 is medium inserted in between.

In the embodiment according to FIG. 8, the paper web runs substantially horizontally directly on both coaties. It is running through Nog Stations 1 and 2. Coating station 1 also has a coating device 11 with a coating roll 12. coating stay The machine/2 has a first nozzle coating device 2.1 and an integrated scraping plate 2.3. A second nozzle coating device 2.2 is arranged. This allows floating web drying Machine 5 and finally drying group 6 follow.

The device according to FIG. 9 is almost the same as the device according to FIG. However, in this case is an infrared light source on one side of the paper web, between both coating stations 1 and 2. A line dryer 6 and a hot air dryer 7 are inserted in between.

The device according to FIG. This is different from the device according to No. 9. Devices 6.1.6.2 and 6.1.6.2 on each side of the paper web It can be seen that there are 7 l and 72.

The equipment according to Fig. 11 is different from the equipment according to Fig. 10 up to coating station 1. It's the same. This equipment, in other words, corresponds to the roll 1. Placed in 2.1.4 It has two nozzle coating devices 1, 1.1.3.

The various relative devices shown and described herein are capable of most different operations.

Thus, for example, in the installation according to FIG. Option 1, in which case a nozzle coating device and a scraping plate are provided. The present coating station 2 is pivoted out of use. Equipment according to Figure 8 Then, the predetermined amount of paint is nozzle applicator 2.1 of coating station 2. It can be applied by brushing.

Furthermore, in the installation according to Figure 4, approximately 0.35 g/m2 to 2.0 g/m2 of glue The suspension and approximately between 2 g/m2 and 8 g/m2 of the pigment suspension are coated. applied by the nozzle applicator in station 1, and then approximately 4g/m2 A second application is carried out at coating station 2 at 12 g/m2. So Coating blades or flat rods on scraping plates connected from one to the next Equalization is performed by

Yet another variant is the suspension of glue by the nozzle applicator of coating station 1. It is an application of liquid or pigment. At the second coating station 2, 5DTA - the nozzle applicator has a coating weight of 4 g/m2 to 6 g/m2; Apply the next coating layer and, in case of simultaneous equalization, by a blade or rod. Apply. In this case, the second nozzle coating device FL2. 1 will be removed from use .

The equipment according to Figure 4 operates on the so-called wet-in-wet principle. It works.

The intermediate drying of the coating applied with the coating station 7l is effective. There is also. Various infrared drying devices or air drying devices are useful for this purpose.

In the installation according to FIG. 6, as already mentioned, the coating station 1 has two nozzles. Coating device 1. 1 and 1.3. In this case, use an infrared dryer and It is particularly effective to connect an air dryer immediately after. With this application concept, coating At the printing station l, glue and pigment are applied to both sides of the paper at the same time, The coating then contacts the opposite roll at coating station 2. It is possible to dry completely to the touch.

In coating station 2, the surface coating on the paper side is therefore carried out in the first stage. 1 nozzle coating device 21 or 5DTA-nozzle coating connected next It is applied by device 2.2. Equalization is done by blades or rods.

The two construction principles are transformed so that the advantages are combined and no disadvantages appear. That is, it is combined with equipment 6. In detail, it is as follows.

Indirect application by nozzle applicator - i.e. first on the outside surface of the roll and then Application onto paper webs has the advantage of complete coverage of the paint without worrying scratch streaks. are doing. However, in the case of using waste paper, such a device as an equalizing element is The coating of the blade is a problem.

Has a nozzle applicator and a coating blade or rod as an equalizing element The structure of coating station 2 leaves no scraping marks and is clean. It is very suitable for removing the so-called film splitting phenomenon.

Such a combined method has the desired final coating weight and It is possible to produce paper containing waste paper. At the first coating station, The base paper, including waste paper, can be pre-processed without any problems using the Zuru coater, and the second coating method can be applied. coating station with its nozzle applicator and coating blade. , maintains the desired coating quality in terms of smoothness, opacity and surface density. I testify.

In the method according to the invention or the apparatus according to the invention, a fluid film on a paper web is desired. Unusual orange peel effect s) Measures are taken to homogenize the film after coating to prevent .

The solution to this sub-challenge is to apply the free flow of the paper web immediately after the nip between the rolls. The device is provided with a spreader (friction) element. It is in the fact that This spreader member consists of a paper web on one side and a spreader on the other side. Due to the relative speed between the contact surface of the duct and the member, it is itself a dense, almost uniformly act so that a textured paper surface is achieved. In particular this means that the spreader Rotational movement of a member and/or its oscillating movement about the longitudinal direction and/or This is accomplished by its vibratory movement across or along the paper web.

Figure 12 shows a 20-le press. arranged parallel to each other's axis and rotated Roll l and roll 2, which are rotatably supported, mutually support the passage of the paper web 4. A roll gap 3 is formed for this purpose. Both rolls are driven in opposite directions Ru. Flowing to the side of the part that rotates from the bottom to the top around the rolls of each roll L and 2. An application unit 5.6 for sexual media is arranged. In that case, the coating device 5 The coating device 6 applies the paint and the glue onto the roll. Paper web 4 is from top to bottom It is fed through the roll nip 3 in the opposite direction. In that case, the roll gap forms with the paper web. In region 7.8, a film of flowable medium on the roll surface is applied onto the paper web. Ru. The desired coating thickness is achieved by feeding the paper web from top to bottom through the roll nip. A dye or glue is applied onto the paper web. In the next free flow of the paper web, the paint A spreader member 10 is arranged on the side. One part of this spreader is in the case of a rotationally symmetrical body 10a implemented as a roll, which is subject to a certain pressure. Force is being pushed onto a paper web coated with paint. This roll can be rotated is supported and driven by. This roll can be used in the running direction of the paper web or in the opposite direction. rotates about its own axis in the direction and is not shown in detail in this figure. A further drive provides a vibratory movement across the paper web. Then paper The rotation is carried out via a direction changing member, shown in this figure as guide roller 11a. Furthermore, it is sent to another processing device.

All drive possibilities (methods) can be accommodated by this method [1]. In that case, the main The main different characteristics are the running direction of the paper web and the relationship between roll rotation and paper web speed. is the direction of rotation with respect to the relative velocity of

The roll rotates in the web running direction and the relative speed between the roll rotation and the paper web If is equal to Zeda, then the spread (Verreibe effect) effect is The roll causes 1) a longitudinal vibratory movement on the paper web; 2) Oscillatory motion across the paper web 3) Hold only when performing a combination of transverse and longitudinal movements on the paper strip S. It is proved.

If the rotational speed of the roll is not equal to the paper web speed, i.e. the rotational speed of the roll and the paper web speed are If the relative velocity to the web is not equal to zero, the corresponding spread effect will be low. This is accomplished by the rotational movement of the wheel. It is increased by additional vibrations.

The superposition of roll rotation and additional vibratory movements on the paper web or the running of the paper web enables horizontal spreading in the paper web direction and paper web running direction. , while only the rotation of the rolls causes the most spreading in the running direction of the paper web. make it convenient. In summary, roll rotation and roll rotation in the paper web running direction In the case of the existence of a relative velocity between rotation and paper speed, the following possibilities are obtained.

1) The roll performs only pure rotational motion, 2) the roll provides additional vibratory motion across the paper web; 3) the roll provides additional vibratory motion across the paper web; 4) the roll is moved in the longitudinal and longitudinal directions relative to the paper web; Perform a combination of horizontal and horizontal movements.

When the roll rotates opposite to the running direction of the Gion web, the spreading effect is This is achieved by rotation alone, but only along the running direction of the paper web.

Additional vibration of the rolls transverse to the paper web running direction favors the spreading effect. This is the case. Vibratory motion along the paper web running direction and longitudinal direction relative to the paper web A combination of and lateral movements is possible.

Typically, the rolls are driven in the same or opposite direction relative to the paper web.

The relative speed required in this case is adjusted to an optimal value.

If the roll is rotatably journaled and not driven, the speed of the paper web They are thus rotated together by the paper web. Therefore, the spreading effect To achieve this, a device is needed to retard the roll. Furthermore, in this case, To ensure good spreading over the entire paper web plane, the roll is It is effective to perform a vibrating motion transverse to the running direction of the web.

The roll surface can be smooth or implemented as a textured profile. can be done. Yet another possibility exists on rolled rolls of wire.

Smooth rolls may be made of, for example, Teflon, rubber, polyurethane or ceramic. Preferably, it has an abrasion-resistant coating that repels paint. roll direct The diameter is preferably 100 mm to 400 mm.

FIG. 13 shows the same 20-le press as in FIG. arranged parallel to each other's axis is rotatably supported and has a roll nip 3 for the passage of the paper web 4. Roll 1 and roll 2 are formed with each other. both roles are opposite of each other driven in the direction. The part running from the bottom to the top around the roll of each roll 1.2 An application unit 5.6 for the flowable medium is arranged on the side of the unit. paper ware The roll 4 is fed through the nip 3 from above to below. In that case, the roll gap In the area 7.8 forming with the paper web, the film of flowable medium is attached to the paper web. It is applied on the surface. Both applicator devices apply paint onto the roll surface. roll By feeding the paper web from top to bottom through the gap, the desired thickness of paint is applied to the paper web. applied on top. Spreadin paint on both sides of the paper web next to the free flow 9 A spreader member is placed in each case for the purpose of cleaning. In the case shown, the rotation pair One of these spreader members, designated 10a, is a rod in the figure. The surface of the rod is In the case of , it is smooth and the diameter is preferably 10 mm to 30 mm. on the stick Wrap the wire or give its surface a textured profile. There is a possibility that it will increase.

The rod itself moves very slowly for self-cleaning purposes and to prevent local wear. Rotate. In order to achieve a good spreading effect, additional Additional drive possibilities (methods) are also available around the rod axis and along the paper web running direction. to achieve a vibrating motion transverse to the paper web direction or longitudinally relative to the paper web. and shall be provided for a combination of lateral movements.

This embodiment also allows the use of rolls on both sides of the paper web. Drive method The system and configuration are performed as explained in FIG.

Preferably, the spreading members are arranged on both sides of the paper web so that they are mutually arranged in the direction of travel. It is placed so that it is offset to the

After the spreading member, the paper web 4 passes through a deflection device, in this figure a guide roller. After passing through Lalla, it will be sent further. In this case, if the coat is still moist and damp, To prevent the rolled paper web from coming into contact with the guide roll lla, There is also the possibility of providing a drying process between the drawer and the spreading member. Ru.

FIG. 14 shows a modified version of the 20-press apparatus already described in FIG. are doing. They are driven in opposite directions and form a roll gap 3 with each other. Via rotatably supported rolls 1 and 2 parallel to two axes, the paint is The rolls are fed by two feeding devices 5 and 6, each located in one of the rolls. applied on the surface of the roll and during the passage of the paper web 4 through the roll nip 3. applied onto the web. In an open stream, this figure also shows spray on both sides. A lining member 10a is arranged. This is explained in Figure 2 or Figure 1. It can be implemented easily. Similarly, the driving method can also be realized as shown in the above diagram. .

In this case, the direction of the paper web is changed through the air arc nonyon direction changing device 911b. It is done without contact. It is a paper web still wet with paint. The direction can be changed without direct contact between the paper web surface and the direction changing member, It also has the advantage of not requiring an intermediate drying device in front of it. paper web Next, it is dried by the Sekiyu 1-line device 12a. Further drying possibilities (methods) ) is shown in FIG. 14b, and that is after the infrared dryer 12a of the paper web. , and further undergoes floating drying 12b.

The 20-le press device shown in FIG. 15 has substantially the structure and structure of the device described in FIG. and functions. Reference numerals are provided correspondingly. spreader one The member has a convex working surface 10b in its side view, and in this figure it has a hydropermeable surface 10b. A rod carried out as a tuni () lydrobar 5chuhe) is used. It is.

The radius of curvature of the working surface of rod 10b is preferably greater than the radius of the roll used for it. Since it is selected to be large, the effective working surface of the spreading member is formed large. It is.

The hydrobar shoes can be fixed or have a paper web (not shown). Additional drives can be provided for achieving a transverse oscillatory movement.

The hydrobar shoe may be smooth or as defined in Figures 16 and 17. A profile (surface pattern) can be provided. Preferably, the The lofil does not extend over the entire surface of the hydroburn knee, but instead runs on a paper web. It extends only over the first ascending curve in the row direction. The next descending part is flat. It is being implemented smoothly. Therefore, the paint coating becomes rough due to its unevenness. and then spread evenly. Then the paper web is The material 11 is then sent to, for example, the next drying device.

Possible profile shapes are shown in Figures 16a, 16b and 16c. There is. The working surface profile shown in Figure 16a is wavy. Figure 16b and Figure 16c demonstrates the possibility of using tooth and rank profiles.

Figures 7a1, 17b and 17c provide a top view overview of possible profile contours. It is shown in In that case parallel profile contours, profiles with an inclination Profile contours with contours and alternating slopes are conceivable.

The spreading elements to be used, their number, i.e. the spreading elements on the same paper web side. The selection of the possibility of continuous connection and drive possibility (method) of the connecting members depends on the specific done for the use and effect to be achieved.

Danq2 fence Dan 9 West dan9ka 2 dan9ka danhai Dan 92 Dan 9 Dan (Wataru) Continuation of front page (51) Int, C1,' Identification symbol Internal reference number D21H23156 I

Claims (25)

[Claims] 1.1.1 Paper coated on both sides, 1.2 Paper web or coating A low-strength (waste paper-based) paper web coating characterized by being dried after drying. In the coating method, 1.3 coatings are combined with two or many coatings. applied by 1.4 Each coating station applies a portion of the total coating amount. coated, in which case a portion of the individual coating amount contributes to the total coating process. Added to the total coating volume at the end, after each application of 1.5 part coating volume, the paper A method characterized in that the web is dried. 2.2.1 First apply the entire intended coating amount on one side of the paper web. cloth, 2.2 Then dry the paper web, 2.3 Then apply the full coating amount planned for it on the other side of the paper web. cloth, 2.4 Method according to claim 1, characterized in that the paper web is then dried again. Law. 3.3.1 One side of the paper web by at least one coating station 3.2 Then apply a portion of the total coating amount planned for this side to the top of the paper. the web is dried; 3. Third coating station or many next coating stations In the The missing part of the planned total coating amount is applied to this side, and 3.4 or A method according to claim 1, characterized in that the paper web is dried again. 4. Claims that the coating amount per surface is 0.5g/m2 and 12g/m2 The method according to any one of items 1 to 3. 5. If the paper web is 5. The method according to claim 1, wherein the degree of dryness is not less than about 70% at any point during the drying process. The method described in any one of the above. 6. A metered layer is applied onto the outside surface of the roll, and that layer is then applied onto the outside surface of the roll. at least one coated paper web such that the coating is transferred from the paper web onto the paper web. The method according to any one of claims 1 to 5, wherein the method is performed indirectly at a processing station. How to put it on. 7.7.1 with coating station for indirect coating; 7.2 The coating stations are arranged parallel to each other and pass through the paper web. Two rolls with a roll gap for Transfer the paint layer onto the outside surface of one roll to transfer the paint layer from the outside surface of the roll onto the paper web. 7.3 At least one application nozzle for metered application and having a drying device are doing 7. A device for carrying out the method according to claims 1 to 5, characterized in that:7. 4 Numerous coating stations are provided, 7.5 total coating volume Each station is designed and configured so that only a fraction of the amount of 7.6 A drying device is connected after each coating station. A device characterized by: 8. Each coating station has its own applicator roll for each roll. 7. The apparatus of claim 6, which is a double blue coating station. 9. Each coating station has coating nozzles on only one of both rolls. 7. The apparatus of claim 6, wherein only a single coating station is located. Place. 10. At least one coating station is a double coating station. and at least one coating is a single coating. 7. The device of claim 6, which is a station. 11. on at least one side of the paper web in free flow (9) after the roll nip; , a spreading member (10a, 10b) is provided, which substantially Apparatus according to any one of claims 7 to 10, extending over the entire width of the paper web. . 12. One applicator (5) applies the paint and the other applicator (6) applies the glue. It is applied to the outer surface of the rolls (1, 2) placed in such equipment, and the spreadin Claim 7, wherein the coating member is arranged on the surface of the paper web coated with paint. 12. The device according to any one of items 1 to 11. 13. Both applicator devices (5, 6) apply paint to the rolls placed on them. spreading members (10a, 10) applied on the outer surface and on both sides of the paper web. 13. Apparatus according to any one of claims 7 to 12, wherein b) is arranged. 14. Spreading members (10a, 10b) are connected to the paper web (4). 14. According to any one of claims 7 to 13, the lines are arranged on both sides of a common vertical line. equipment. 15. Spreading members (10a, 10b) are arranged on both sides of the paper web in the running direction. according to any one of claims 7 to 14, which are arranged offset from each other. Device. 16. The spreading element is implemented as a rotationally symmetrical body (10a). The device according to any one of claims 7 to 15. 17. 17. The device according to claim 16, wherein the rotationally symmetrical body (10a) is rotatably supported. Place. 18. 17. Device according to claim 16, wherein the rotationally symmetrical body (10a) is drivable. 19. Any one of claims 16 to 18, wherein the rotation speed of the rotationally symmetric body is not equal to the paper speed. The device according to item 1. 20. Claim 1: The rotationally symmetrical body (10a) rotates counter to the running direction of the paper web. 6. The device according to 6. 21. The spreading member comprises a rod having a convex working surface (10b) in side view. Coating the fluid medium according to any one of claims 7 to 15 carried out as equipment to be used. 22. Each spreading member vibrates about its own axis. 22. The device according to any one of 21. 23. Individual spreading members (10a, 10b) spread across the paper web. , and/or vibrating along the paper web. The device described in. 24. The working surfaces of the individual spreading members (10a, 10b) are smooth. 24. Apparatus according to any one of claims 7 to 23. 25. The working surfaces of the individual spreading members (10a, 10b) are substantially exposed. 24. A device according to any one of claims 7 to 23, wherein the surface is patterned.