FI108241B - Process for the manufacture of coated fiber web, improved paper or paperboard machine and coated paper or paperboard - Google Patents

Description

108241

A process for making a coated fibrous web, improved paper or paperboard, quilted paper and coated paper or paperboard.

Förfarande för tillverkning av beläggd fiberbana, förbättrad pappers-eller kar-tongmaskin och beläggd papper eller cardboard 5

The present invention relates to a process for making a coated fibrous web, such as paper or board, according to the preamble of claim 1, to an improved paper or board machine according to the preamble of claim 10, and to a coated paper or board of claim 19.

The process of the invention and the paper or board machine can be very widely applied to the manufacture of various types of paper and board where the conventional method would be to improve the quality of the paper or board by pre-coating. Typical such writing and printing papers include fine paper, LWC base paper, or improved newsprint, well known to those skilled in the art. The coating of different board grades has also increased in recent years. In the future, however, the invention will be described mainly in connection with the manufacture of fine paper without limiting the invention therein.

In this specification, fine paper refers to uncoated fine paper and coated fine paper. Uncoated fine paper typically has a basis weight of 40 to 230 g / m, coated 60 to 250 g / m 2. A typical pulp for fine-paper making comprises chemical fiber: short fiber obtained, for example, from birch, and the eucalyptus wood method is generally supplemented with long fiber material obtained from conifers.

The proportion of mechanical pulp is generally less than 10%. The filler 30 is added to the mass of about 15-30% and the filler may be stone, calcium carbonate, kaolin and / or 2,108,241 'other suitable mineral pigments. Recently, the use of recycled fiber has also begun to increase in the production of fine paper.

As mentioned above, the process of the invention and the papermaking machine 5 can advantageously produce paper corresponding to the pre-coated fine paper. Conventional pre-coating has, in this embodiment, sought to impart certain properties to the surface of the web, which are advantageous for further processing of the web. These features include: desired surface porosity and pore size distribution; and desired oil absorption level as measured, for example, by the Cobb-Unger method. Pig-10 blade coverage is also one feature to monitor. Thus, the fine paper manufacturing process of the invention, which does not employ conventional pre-coating, achieves the same values for said properties as when using a conventional pre-coating process.

Correspondingly, according to the coated fine paper, the invention can also be applied to paper grades containing mechanical pulp, which are coated at the final stage of the manufacturing process. Typical such paper grades are LWC and MWC.

The method and apparatus of the invention can also be used to produce 20 better newsprint without a surface sizing unit. This significance of the invention becomes all the more significant as the faster wordpress machines become or the thinner the newsprint develops. Four-color printing requires a firmer and dense surface. As is known, this has previously been shown to be achieved by surface treatment of the web.

25

Cartons are increasingly required to have a better printing surface. The Invention - Offers Good Opportunities Without Costly Investment in the Dry End of a Board Machine. In the manufacture of multilayer cartons, the invention also provides an advantageous solution for improving the printing properties of the webs 30 forming the multilayer carton surface layers. The pile strength of multi-ply paperboard can also be enhanced by feeding, for example, starch onto the web surfaces.

3, 108241. In prior art paper or board machines, the short circulation and other pulp system is most commonly constructed to blend fibers, fillers, fines, and additives into a homogeneous pulp for feeding to a paper or board machine headbox. It is also known in multilayer striping to use a plurality of separate pulp arrays to deliver different fiber suspensions to one or more headboxes. The headbox spreads the resulting pulp suspension evenly over the wire section, where dewatering and web felting begins. Various types of wire parts or formers known to the skilled artisan are known in the art. plane formers, hybrid formers and kit formers. Board machines may have multiple wire units. The most preferred former for the invention is a kitformer, in which the head jet lip jet is passed between two wires and most of the water is removed between said wires in two directions. A preferred dieformer solution is described in Presentation L. Verkasalo: Efficient Forming at High Speeds, 11th Valmet Paper Technology Days 1998. Prior art solutions have limited control over the fiber and filler distribution in the thickness direction of the web, e.g. with the placement and vacuum of former dewatering elements. Fillers often become enriched on the web surfaces during the dewatering steps.

20

As such, multilayer headboxes are known in the art, such as those described in M. Odell, Multilayering, Method or Madness ?, XI Valmet Paper Technology Days 1998, and U.S. Patent 92,729, and also described in P. Ahonen, Challenges for Digital Printing Paper. , XI Val-25 met Paper Technology Days 1998. Multilayer headboxes provide the desired layer structures to the web by depositing pulp layer by layer between the wires.

• Instead of the multi-layered headbox, especially some board grades, several headboxes and wire units have been used to provide a layered structure.

From the wire section, the web is introduced into a press section, where water is removed from the web by squeezing it against one or two felts. One of ordinary skill in the art is familiar with a variety of press solutions of 4,108,241, such as roller nipples marketed by the applicant under the trademark SymPress ™ II. Recently, all types of paper and board have increasingly used roll-over nipples instead of roll nipples because of their higher dewatering capacity 5 and / or web swing retention capability.

In paper and board machines known in the art, the dryer section is most commonly formed from a conventional single and / or double wire dryer, wherein the drying is performed mainly by cylinder drying as the wire 10 presses the web against the heated cylinder surface. At high speeds, single wire passage through the entire drying section has become more common in recent years. The most recent solution, for example, in patent application PCT / FI98 / 00945 is the combination of over-blowing with cylinder drying to provide a higher evaporation rate and a shorter drying section.

15

In some prior art solutions, the paper web is led from the dryer section to a pre-calender which, in known solutions, may have a hard or soft nip calender in which a paper web is led from the nip between rollers to provide smoothness to the paper web surface. The pre-calender also attaches loose fibers 20 or other pulp components to the surface of the web, but at the same time may also cause differences in density to the base paper and lose the bulk density of the web important to many grades. Pre-calendering is particularly important prior to web coating when blade coating is used. to avoid sharp lines.

25

According to the prior art, after the drying section or pre-calendering, the surfaces of the web are pre-coated with a starch or pigment solution, for example under the Applicant's trade name OptiSizer ™, marketed by a film adhesive press-type applicator. The pre-coating is typically carried out at this point on both sides of the web at the same time, but the web surfaces can also be pre-coated separately in successive units. The paper web is then dried using infra-dryers and fluidized dryers followed by a short set of cylinders.

Subsequently, as is known in the art, the web is surface-coated with prior art blade, roll or jet coating units and dried using infra and fluidized dryers and cylinder drying. The dried paper or board web is rolled, followed by a multi-nip calender to give the paper or board the desired level of smoothness and gloss. On-line calendering has also become more common lately.

10

On the other hand, in some prior art solutions, the calender and roller are often followed by a drying section. An unroll roller is then disposed from which the web is guided to an off-line coating station. Various coating stations are known in the art. In a known solution is first carried out of the paper web 15 of the second side of the pre-coating, followed by drying section and then esipääl-plated on one side of the paper web, followed by drying section. The pre-coated web thus obtained is finally coated with second coating layers and thereafter the web is dried and re-rolled. This is followed by unwinding and web calendering and rewinding. The final machine after the drying section may thus be an on or off line machine. 1 · «

Thus, prior to coating, as is known in the art, the paper may be very porous, so that after the dewatering and drying treatments, the paper web must be pre-coated before the actual surface coating. This also causes the paper web to be dried after pre-coating in order to add the actual coating to the surface of the paper web. The equipment and \ paper exports required by these steps greatly increase the length of the fine paper production line. With this dual coating of fine paper, i.e. front and actual surface coating, it has been sought to achieve a physically and visually smooth coated paper surface 30 for printing. The primary function of the pre-coating in this coating process is to properly reduce the pores in the surface structure of the base paper or board, so that the surface coating remains on the surface and does not sink into the structure of the paper or board. If the coating is very unevenly distributed on the surface of the paper or board, even after the surface coating, the paper or board is uneven and may exhibit, for example, a glossy finish or other visual defect. For example, with the fil-5 miniature transfer technique, it is possible to achieve a uniform surface coating layer and thus good coverage, which is a desirable property precisely during the pre-coating step, since flat pre-coating is a prerequisite for achieving a smooth surface coating. After the pre-coating, the web is known to be surface-coated, e.g. with a blade coating, to achieve a smooth surface. However, this places space requirements under the paper or cardboard post-processing line, since the paper or board is coated in 3 to 4 different stages, as often different sides of the paper or board web are coated at different stages.

Thus, in prior art paper and board machines, an adhesive press or a film transfer type coating is generally used to pre-coat the web. In this case, a surface adhesive or a similar coating agent is applied to both sides of the paper web in aqueous solution in one or two steps with the aim of bonding the fines and fibers to the surface of the web and thereby creating favorable conditions for any subsequent coating. From the prior art solutions, thus having 20 separate pre-coaters, one problem is that the length of the paper or board machine or coating line increases. This increases the investment costs for both the machine itself and the building. The lack of space for replication can sometimes be a direct barrier to the introduction of new technology. When applying aqueous material to the web, drying is required, which not only increases the machine length and investment costs, but also increases the need for drying energy. In addition, open exports need to be made to the paper machine, which can cause web breaks and other runnability problems *. especially with lighter paper types and high speeds.

Prior art related to the invention also refers to Applicant FI-30 Patent Applications 981330 and 981331. These provide an integrated papermaking machine disclosed in FI Patent Application 981330 which can produce high-quality paper at speeds in excess of 2000 m / min. current paper machines.

FI patent application 981331 discloses a paper machine specifically intended for the production of paper having copy paper properties and good porosity for color powder printing.

Figure 1 illustrates a cross-section of conventional paper according to the prior art. At present, surface sizing of fine paper base paper 1 utilizes pastes of typically low solids (8-12%) to provide surface sizing layers 11 to ensure penetration of the coating paste through the paper; thus, the adhesives to be pressed from the various sides of the paper must "face" in the middle of the paper and form a bond that increases the strength of the paper 2. Thus, a low dry solids content (8-12%) aims to reduce the viscosity of the applied coating paste. This is necessary in the present state of the art to achieve sufficient strength properties because, when the dry solids content of the paste is increased, the adhesive remains on the surface layers of the paper and the desired bonds to the inner parts of the paper or board cannot be formed.

20 The use of low solids (8-12%) pastes results in "thoroughly" wetting of the paper and thus a high post-drying need and problems with the runnability of the post-drying section. Raising the dry solids content of the coating paste alone reduces the paste penetration into the paper or board and thereby degrades the z-directional strength properties. On the other hand, lowering the viscosity of the high consistency paste by merely changing the properties of the starch easily leads to an increase in curvature and bubbling tendencies.

A problem with base paper or board in office papers is the z-directional distributions of paper or board, particularly the filler distribution, which copy paper should be of a type that has less filler in terms of dusting. On the other hand, office papers aim at the versatility of paper or board, i.e., 8 108241 paper or board should also be suitable for inkjet printing, whereby a filler is required on the surface to provide a dense surface.

It is an object of the invention to provide a novel and inventive method for producing a surface-glued paper or board web that can use pastes having a higher dry matter content (> 15%, preferably 15-25%) without compromising the strength properties of the formed web and the web. runnability. It is a specific object of the invention to reduce investment costs by providing a paper and board machine 10 which is shorter than the known solutions for producing paper and board grades traditionally demanding and thus provide an improved paper or board machine. It is a further object of the invention to provide an inventive paper or paperboard of novel structure which has good strength properties and is well suited for a variety of applications.

These objects have been achieved by a process for the manufacture of a fibrous web, such as paper or board, coated in the foregoing, having the particular features set forth in the characterizing part of the accompanying independent claim 1, with an improved paper or board machine. • and coated paper or board with specific characteristics are set forth in the characterizing section of the attached independent claim ♦.

The invention achieves significant advantages: 25 · The high dry solids content of the coating paste (> 15%, preferably 15-25%) results in the need to apply the web web and squeeze it into the surface layer or layers ** with a lower dry matter content (g / m2) - Substance content after the surface coating part, which results in less need for post-drying and better runnability of the post-drying part 30 · Chemicals in the middle layer (z-strength properties) and in the surface layer (surface strength) can be optimized independently.

9 108241 • When using single-wire export, the curl tendency caused by the post-drying section is reduced as the need for post-drying decreases. The resulting humidification curve adjustment devices can also be dispensed with, which further reduces the need for post-drying.

5 · The resulting paper is multifunctional (copy, ink-jet)

According to the invention, the multi-layer headbox uses an additive and filler coating on the pulp, and a single-layer headbox uses a mixture of additives or fillers on the pulp, which replaces the prior art post-treatment 10 part coating. In the coating of additives and fillers, the pulp can be divided into three different mass streams for the top layers and middle layer of the base or base layer, i.e. base paper or board, each of which is fed with the desired additives and fillers, particularly starch. If necessary, the additive and excipient may be fed from a plurality of sites or at several different stages into the mass flow. According to a preferred embodiment of the invention, fines may also be added. Further, in the context of the invention, fiber enhancement can be advantageously used, whereby the pulp is separated for the top and middle layers of the base paper or board so that the desired type of fibrous mass is led to the top layer or base layer of the base paper or board. In addition, retention agents known in the art which bind the filler and fines to the surface can be used, which prevents their migration away from the surface layers of the base paper or board with water. The retention agent may also be fed in layers.

Thus, according to the invention, the pre-coating is integrated into the initial part of the paper or board machine and the additives and fillers are introduced into the web surface right from the start of the web production. In this way, a sufficiently small pore size is obtained on the surface of the body or base layer, i.e. the base paper or board, so that the actual application coating surface, preferably the surface sizing paste, remains on the surface of the base paper board. This also creates an advantageous surface for printing processes where the ink does not penetrate deep into the web.

10108241

The invention can achieve a pore size of 1/10 of its original value on paper or board. Optimal surface sizing coverage is achieved when the pores on the surface of the base paper or board are so small that the surface sizing does not penetrate and thus remains on the surface. This is achieved by adding additives and fillers even before the headbox to the mass flows, and preferably by applying the fiber deposition, and possibly by adding fines to the mass flows to the surface layers of the base paper or board.

Thus, in the invention, pre-coating has been replaced by the deposition of additives and fillers on the head flows into the stream, thereby improving process efficiency and reducing investment costs. The paper or board machine of the invention, in which the pre-coating has been replaced by the additive and filler deposition technique for headbox mass flows, comprises, according to a preferred embodiment, a multi-layer headbox, kitformer, press section, dryer section, surface coating station / s.

In the process of the invention, a short rotation and a headbox can be applied which allows for the layering of additives, excipients and / or fine matter. One such pulp feeding arrangement which is preferably used in the invention is disclosed in U.S. Patent No. 92,729. Fillers, fines, and additives may also be supplied only in the headbox itself. One such arrangement is described in EP 824157. Short circular arrangements may be generally known per se in the art, but it is particularly advantageous for the invention to apply the short rotation marketed by the applicant under the trademark OptiFeed ™, such as described in FI patent 103676. OptiFeed ™ using the arrangement minimizes short-cycle mass volumes; a change of species can be made quickly on a paper or board machine according to our invention without long-term interference, for example in a pulp composition, 30 π 108241

The paper or board machine according to the invention thus has a short rotation and a multi-layer headbox or a single-layer headbox which at least allow the fillers to be deposited or mixed respectively. The former is most preferably a gritformer, which allows higher speeds than other types of former and has the ability to perform dewatering on both sides to obtain symmetrical paper. For example, one of the wire forming machines marketed by the Applicant under the trademark OptiFormer ™ or a similar type of form as described in the above-mentioned presentation by L. Verkasalo: Efficient Forming at High Speeds, XI Valmet Paper Technology Days 1998.

10

Known press solutions can be utilized in a paper or board machine according to the invention, but in many cases long nip presses are preferred. The so-called shoe press achieves good bulk and high solids and minimizes asymmetry in the web. For example, the use of Applicant 15 dual felt OptiPress ™ press sections achieves symmetrical dewatering and a surface symmetrical web. When aiming for high solids, it may be advantageous to replace the second blanket with a water-insoluble and highly web-transferable fabric, the so-called. the transfer belt. Although the invention substantially reduces the need for separate coating devices, in some applications it may be advantageous to combine surface sizing with a press section, whereby a separate post-drying surface sizing unit and associated subsequent treatment may not be required. One such solution (wet end sizing) is described, for example, in U.S. Patent No. 4,793,899.

The invention does not impose any particular requirements on the drying section, but in connection therewith, drying solutions known in the art can be applied, for example a drying section employing a single wire cloth, which may additionally be combined with an overflow * f »·; for drying power, profiling or rapid species conversion. Such a modern drying section is shown e.g. International Patent Application PCT / FI98 / 00945. In particular, for paper grades, it is advantageous to use a drying component marketed by the Applicant under the trademark OptiDry ™ or the like. If desired, the drying section may employ pre-calendering as disclosed in Example 10 0834 of FI 104434, which discloses calendering drying against a cylinder. Of course, pre-calendering can also be performed between two rolls. Of course, if necessary, pre-calendering can also be done after the drying section.

5

The remainder of the paper machine or board machine according to the invention has no pre-coating since the coating is done in a headbox where layers of fillers and / or starch are deposited and no surface sizing except for possible wet surface sizing with the press section. Thus, when the paper or board comes from the actual drying section, the surface is coated with one or more surface coating stations, followed by an on- or off-line multi-nip calender.

In those embodiments of the invention in which the web is separately coated at the coating station, for example, a blade coating, jet, film-transfer or spray-type coating apparatus is used for coating. With the coating device, the coating material is freely applied to the surface of the web either as a continuous jet or as a spray or the coating is applied by a roller. Preferably, for example, a coating device marketed by the applicant under the trademark OptiCoat Jet ™ or similar is used.

20

To eliminate web breaks, the web may be coated with a belt. The supported coating is disclosed, for example, in the Applicant's Finnish Patent FI 101489 and in the article 1998 Coating / Paper Machine Makers Conferens, TAPPI Proceedings.

25

Drying after surface coating can be started with a non-contact dry; such as the applicant's trademark PovverDry ™ or a similar type of dryer providing high drying power and, if necessary, rapid change in drying power. In fact, thanks to the invention, non-contact drying 30 can form even the main drying form so that the subsequent short cylinder group functions essentially only as a traction group.

is then 08241 ', Preferably followed by a multi-nip calender, most preferably on-line, marketed by the Applicant under the trademark OptiLoad ™ or the like, which differs from conventional super calendars in that its line loads 5 on each nip can be individually adjusted. In this way it is possible to save sweat, but achieve good shine and smoothness. Of course, reference is made to FI patent 96334 for this type of calender. Of course, off-machine calendars may also be used in connection with the invention.

10 Next, there is a roller, preferably a roller marketed by the applicant under the trademark OptiReel ™ or a type suitable for smooth web winding.

The process according to the invention can be used to produce paper or paperboard which corresponds to a web produced by a prior art machine provided with a pre-coating unit. However, the paper or board machine according to the invention does not comprise a pre-coating unit. According to a preferred embodiment of the invention, neither a surface sizing unit nor preferably a pre-calender is required.

20

In a paper or board machine according to the invention, the need for post-drying is substantially reduced compared to the conventional post-drying part. It is assumed that the paper machine capacities remain the same and that the normal low dry solids content of the coating paste is about 10%. When the dry solids content of the coating paste can be raised to a high level, e.g. to about 20%, according to the invention, assuming the base paper is dry when it enters the surface coating portion, it can be shortened to • half the current since only half the water is removed. If half of the coating paste is already deposited on the web with a headbox, the amount of water to be removed by the post-drying section is further reduced by half. Thus, the need for post-drying 30 in the paper machine according to the invention is only 25% of the current, i.e., for example, only one group of three cylinders is sufficient for the post-drying section instead of the previous post-drying section 12,410,8241. In this respect, it should be noted that the high dry solids content of the coating paste (> 15%, preferably 15-25%) results in the need to apply a smaller amount of paste (g / m 2) to the web, higher dry solids content after the surface coating portion. and improved runnability of the post-drying section, and when using a single-wire feed, the curl tendency caused by the post-drying section decreases as the need for post-drying decreases. In this case, wetting curves based on wetting can be dispensed with, which further reduces the need for post-drying.

10

In particular, it is to be noted in connection with the invention that several of the techniques used in the process of the invention and in paper or board binder have only become known recently.

Other aspects of the invention refer to the dependent claims.

In the following, the invention will be described in more detail with reference to the figures in the accompanying drawings, the details of which, however, are not to be narrowly limited.

FIG.2. schematically shows an improved paper or board machine according to the invention, and FIG. shows a cross-section of a paper or board according to the invention.

A preferred example of a paper or board according to the invention is shown in Figure 2.

the machine for carrying out the method according to the invention comprises, firstly, a headbox 100, which is preferably a multilayer headboard 30, as shown in the figure.

15108241

In the multilayer headbox 100, the pulp is deposited such that the mass flows to the surface layers comprise fillers and additives, e.g. starches and hydrophobic adhesives, and any retention agent. In addition to the coating of additives and fillers, fines may be deposited on the surface layers, if desired, or 5 layers of fibers may be used. If it is advantageous for the final product, in the multilayer headbox, the arrangement of the invention enables the desired fillers and additives and fines to be introduced into the desired layer, e.g., the required fillers and additives, etc., into the middle layer. However, for the invention, it is most important that the starch and optionally hydrophobic glue in the multilayer headbox are passed through at least one layer of the multilayer headbox into the pulp. When the multi-layer headbox is a 3-layer headbox, a conventional amount of starch is mainly deposited on the middle layer portion of the base or run layer 1 (cf. Figure 3), i.e. the base paper or board. When the headbox is a 1-layered headbox, a larger amount of starch is blended into the base paperboard. The head-15 mesh is followed by a wire section 200. The head box 100 and the wire section 200 are structured to provide a z-layer layered paper or board web structure and / or a desired z-direction additive or filler distribution (see Applicant's EP 0 651 092). By using the wire section 200 either with one or at least a suitable vacuum to support the retention agent added to the head box 100, the formation of 20 pores can be facilitated. However, it is also important that good formatting is achieved. The wire section 200 should be such that it does not damage the resulting deposition. The gritformer 250 according to the figure is well suited for this purpose, but other types of former are also suitable for use at least to a limited extent. The wire section 200 is followed by a press section 300. According to the figure, the press section 300 uses a long nip press 25, e.g., a shoe press 350, 360, thereby creating the conditions for maintaining porosity. The press section 300 according to the figure comprises two presses 350, 360. The front drying section 400, which follows the press section 300, is formed by an overblow drying section 450 and a conventional cylinder drying section 460 comprising single wire drying groups R1-n. 30 provided by a large diameter cylinder 420 located in the basement space and an overflow drying apparatus 422 disposed adjacent thereto. After the front drying section 400, 1610241 film adhesive presses 500 are placed, followed by a post-drying section 600 formed by a single wire outlet

In the paper or board machine of Figure 2, the passage W of a fibrous web, such as a paper or board web, is as follows. From the multilayer headbox 100, the pulp is fed to the gap between the former rollers 210, 220 of the grit 200 of the wire section 200, from where it is passed through the dewatering devices 230 further supported by the wire 215 to the press section 300. The press section 300 comprises two a press 350 between press rollers 311, 310 supported by a lower web 316. From the lower fabric 316, the web W is guided to the upper fabric 317 of the next press 360 and further between the upper fabric 317 and the lower fabric 318 between the press rollers 321, 320 of the press 360. Each press 350, 360 is formed as a shoe press. From the press section 300, the web 15W is led by transfer fabric 390, while the suction box 391 is held by the web W to the blow drying unit 400 of the dryer section 400, supported by the lower fabric 451 passing by the blow dryer apparatus 450 to single-wire RI. The cylinder drying groups R2 are configured to comprise a large diameter cylinder 420 located in the basement, with an overflow drying 422 in which the web passes supported by a wire 425. The drying fabric of the drying groups applying single-wire threading is denoted by reference numeral 415 and the upper row heated drying cylinders by reference numeral 410 and the lower row rotary cylinders or rolls by reference numeral 411. The web W runs from the lower against a heated cylinder surface. Subsequently, the web W is fed through a measuring device 490 to film adhesive presses 500 having rolls designated 545 and 547 and film transfer apparatuses 548 and 549. Through a non-contacting turning device 580, the web W is fed to a post-drying section 600 comprising one drying group R preferably a single-wire thread and comprising a drying wire 615 and heated drying cylinders 610, as well as turning cylinders / rolls 1111. After the after-drying section, the web is moistened with either water spray or steam to eliminate any curvature by means 650. Subsequently, the web W is fed to a calender 700 which is formed as a shoe calender and its rolls are designated by reference numeral 750, 751. Following the calender 700, the web W is fed to a roller 5, in which the web W is rolled into rolls 811, 812.

According to the invention, the base paper or board forming the base or backing layer 1 of the paper product is formed by optimally depositing headform 10 chips 100 fillers, starches and optionally hydrophobic adhesives in an additive deposition system such that a suitable compact and hydrophobic surface 10 is obtained.

By depositing in a surface coating portion, such as a film adhesive press, 500, the surface sizing layer 11 is formed between the base or body layer 1 and the surface sizing layer (s) 11 by the adhesive bonding layer (s) 1,11. Bandage 2 also affects the z-directional strength properties of paper or board. When the surface sizing layer 11 is starch, the problems of dusting of normal copy paper as the bulk starch improves the surface strength and the filler and fines binder are avoided. In turn, when the surface sizing layer 11 is hydrophobic glue, a suitable hydrophobic surface is provided for penetration of the adhesive into the paper or board (water retention) and for important ink uniformity on the ink-jet paper surface, avoiding ink penetration too deep or ink spreading on the paper.

25

When the multilayer headbox 100 is formed by layering a base paper or board web W having substantially dense and hydrophobic surfaces 10 and passed through a wire section 200 and a press section 300 and a front drying section 400 to a surface coating section 500, The surface sizing of the 30 rophobic surfaces is carried out in a surface coating portion 500 with a cavity coating paste in which an increased dry matter content is achieved by reducing the amount of starch and / or cardboard l and the surface sizing layer 11.

As illustrated in Figure 3, after surface drying, preferably surface sizing, after the pre-drying section, the coating paste is pressed only on the surface 10 of the paper or board layered base or backing layer 1 such that z or 2 bonding of the paper or board and surface-to-surface between the ap-10 plated chemical layer (s) 11. Thus, in the paper or board product of the invention, the surface coating layer 11 extends only a portion of the strength of the base paper or board web and forms a bond 2 between the base paper or board 1 and the surface coating layer 11.

15 This eliminates the need to squeeze the surface-adhesive chemicals throughout the paper or board. A further advantage is that the chemicals in the base or middle layer 1 (z-directional strength properties) and the surface layer 11 (surface strength properties) can be optimized independently of each other and it is possible to produce paper or paperboard with multifunctional properties (copy, ink-jet).

20

The invention has been described above only by means of a preferred embodiment thereof. This, of course, is not intended to limit the invention in any way to such a particular embodiment. Thus, as will be apparent to one skilled in the art, many alternative solutions and variations are possible within the scope defined by the appended claims.

Claims (24)

A method of manufacturing a coated fiber web, such as a paper or cardboard web, in which a mass, in which additives, fillers and fine agents, and retention agents, are measured from an inlet carriage (100) on a vortex portion (200), where water is removed from the web (W); the web (W) is led from the wire portion (200) to a pressing portion (300) for pressing water out of the web (W); the web (W) is dried in a pre-drying portion (400); the web (W) is coated in a coating portion (500); the web (W) is dried in a post-drying portion (600); and the web (W) is wound in a wheelchair (800), characterized in that starch and / or one or more hydrophobic adhesives are mixed or layered in the mass measured out on the wire portion (200) from the inlet carriage (100). on at least one layer of the web (W) which is guided into the coating portion (500) via the wire portion (200) and the press portion (300) and the pre-drying portion (400), a substantially dense surface (10) is formed to which coating paste or starch is applied. having a high dry matter content, whereby a z-directional connection (2) is provided within the web (W) between the base or backing layer (1), i.e. the base paper or carton and the layer of coating paste or starch applied to the surface (11). 20 2. A method according to claim 1, characterized in that the base paper or carton (1) is formed by layering fillers, starches and / or hydrophobic adhesives in pulp streams which are fed to the inlet sled with a system for layering additives in such a way that they are produced. a substantially dense and hydrophobic surface (10) for the surface coating incorporated in the further treatment, advantageously the surface adhesive. Method according to claim 1 or 2, characterized in that a surface coating or sizing paste, whose dry matter content is> 15%, preferably 15-25%, is applied to the coating. 30 in 25 1 08241 4. A method according to claim 2, characterized in that starch and optional glue are passed into the inlet carriage (100) on the base paper or board (1) formed to provide a dense and hydrophobic surface (10) for the coating. Method according to claim 4, characterized in that starch and optional glue are measured in at least one layer in a multilayer inlet box (100). 6. A process according to claim 5, characterized in that starch and optional glue are layered mainly on the middle layer of the pulp forming the base paper 10 or carton (1), when the inlet carriage (100) is a 3-layer inlet carriage. 7. A method according to claim 4, characterized in that starch and optional glue are mixed into the pulp forming the base paper or carton (1), when the inlet carriage (100) is a 1-layer inlet carriage. 15 Method according to any of claims 2-7, characterized in that the surface bonding of the substantially dense and hydrophobic surface of the base paper or carton (1) is carried out in the coating portion (500) with a high thickness coating paste, wherein the amount of starch has been reduced and / or where the dry matter content of the adhesive has been increased. Method according to any of claims 1-8, characterized in that the coating is carried out in connection with the pressing portion (300). 25 An improved paper or cardboard machine for producing a coated fiber web, such as a paper or cardboard web, which paper machine comprises an insert. : travel carriage (100), wherein in the mass measured thereto has been added additives, fillers and fines and retention agents, a wire portion (200) for forming a web (W) and removal of water from the web (W); a pressing portion (300) for pressing water from the web (W); a pre-drying portion (400) for drying the pressed web (W); a coating portion (500) for coating the web (W); a post-drying portion (600) for drying the coated web (W); and a wheelchair (800) for rolling up the web (W), characterized in that the mass being ejected contains starch and / or one or more hydrophobic adhesives in such a way that at least one layer of the web (W) is led the coating portion (500) via the wrapping portion (200) and the press portion (300) and the pre-drying portion (400), a substantially dense surface (10) is formed to which coating paste or starch having a high dry matter content is applied, z-directional connection (2) occurs within the web (W) between the base or backing layer (1), ie the base paper or board and the layer (11) of coating paste or starch applied to the surface. 11. A paper or cardboard machine according to claim 10, characterized in that the base paper or carton (1) is formed by layering fillers, starches and optionally hydrophobic adhesives in a multilayer inlet tray (100) with a system for layering additives in such manner. , that in the web (W) a substantially dense and hydrophobic surface (10) is formed for the further treatment, which comprises surface coating, advantageously surface adhesive. Paper or cardboard machine according to claim 10, characterized in that the dry matter content of the surface coating paste applied to the surface (10) of the web in the coating portion (500) is> 15%, advantageously 15-25%. •. Paper or cardboard machine according to claim 10 and / or 11, characterized in that the base paper or carton (1) fed from the inlet carriage (100) out onto the wire portion (200) contains starch and optional glue. ; :. Paper or cardboard machine according to claim 11, characterized in that in a multilayer inlet carriage (100), starch and optional glue have been fed via at least one layer in the multilayer inlet carriage (100). 30 27 1 08241 Paper or cardboard machine according to claim 14, characterized in that starch and optional glue have been layered mainly on the middle layer of the pulp forming the base paper or carton (1) via the middle layer in a 3 'inlet inlet. 5 16. A paper or cardboard machine according to claim 10, characterized in that a 1-layer inlet tray (100) incorporates starch and optional glue in the pulp forming the base paper or board (1). A paper or cardboard machine according to any one of claims 11-16, characterized in that the coating of the substantially dense and hydrophobic surface of the base paper or carton has been carried out in the coating portion (500) with a coating thickness of high thickness, wherein the amount of starch has been reduced and / or where the dry matter content of the adhesive has been increased. 15 A paper or cardboard machine according to any one of claims 10-17, characterized in that the coating is integrated in the press section (300). Coated paper or cardboard, comprising a base or backing layer (1) of the paper product, ie a base paper or a backboard and at least one coating layer (11), characterized in that an inner connection (2) in paper The sheet or carton between the base or backing layer (1) and the coating layer (11), which adheres the layers (1,11), affects the z-directional strength properties of the paper or carton. 25 Paper or paperboard according to claim 19, characterized in that the coating layer (11) is of starch. Paper or paperboard according to claim 19, characterized in that the coating layer (11) is of hydrophobic adhesive. 28 1 08241 Paper or cardboard according to any of claims 19-21, characterized in that the base paper or cardboard (1) of the paper or cardboard has at least a layer of starch and any hydrophobic adhesive, on a substantially dense and hydrophobic surface ( 10) of the base paper or board is a coating layer (11) which extends over a portion of the thickness of the base paper or cardboard web and forms the connection (2) between the base paper or carton (1) and the coating layer (11). ). Paper or paperboard according to any one of claims 17-20, characterized in that the high dry matter content of a surface coating paste has been achieved with reduced starch content and / or with a high dry matter content of the adhesive. 15 • «