FI81641C - Method and apparatus for coating a web of material - Google Patents

Description

The invention relates to a method and an apparatus for coating a material web. The invention relates to a method and a device for coating a material web.

At present, paper is coated with vlskoottla coating coats, especially with adhesives, on-machlne applications with pläaslalllaestl so-called. 111-10 mauspurlstlmllla. In recent years, the so-called short-delay paving slabs. Perhaps the biggest difference between these is that the air-squeezer adhesive is pressed inside the paper on two rollers, while in the short-end unit the adhesive is applied and smoothed onto the paper surface, after which part of the adhesive liquid is absorbed into the paper by ka-15 column forces.

It is possible to obtain a good quality coating without suction. Due to the penetration of Ralna, it can handle paper with low strength, eg wood-containing papers, at high speeds. With short-20 vibrating knives, the pen penetrator can not be controlled. In which case the internal strength el of the paper cannot be affected, which in many paper-. . species would be necessary to provide adequate reversibility and filler pigment retention.

The object of the invention is a coating method and a coating sheet with which • ·. ·; can be used to control the coating or surface gluing of the penetrant, Jol I created the device to make a good quality pigment coating or a desire-to-feel surface gluing. According to the invention, the coating material is applied to the surface of the web at a high pressure either by a separate or in the nozzle zone nozzle 30 or at a high pressure in the entire application area. The units may be one or more separate or integrated units, which may have different dry matter contents or different coatings. . substances, or it may be integrated with one of the already known coating devices.

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The method according to the invention for coating a material web is mainly characterized in that in the coating unit the coating agent e e • e • • e e 2 81641 1 is applied to the surface of the material web running on the clothes roll at a high palncesna bar coating range of 1-50 bar.

The device according to the invention is mainly characterized by the material pMJI 1lystfimlseksl that the device comprises /! means for bringing the coating trough to the surface of the rally at high pressure with a frying range of 1-50 bar, 4 to 20 bar.

In the method according to the invention, the high-pressure coating material is introduced to the material web immediately via a separate high-pressure nozzle, or the high-pressure coating material is introduced into the material web from a separate wide area through the pallet in contact with the material web. When the nozzle is used, the nozzle 15 extends over the entire width of the web. And through the palm gap between the nozzle and the roller, the coating is applied at high pressure to the material web. In the method and device according to the invention, a pressure of 1-50 bar, suitably 4-20 barlu is applied to the high-beam coating material. When a high-pressure ['coating head 20 in addition to the 20 head) is used, its flaring range is 20 to 200 mbar.

In this case, the ratio of the pressure of the high-pressure coating trough to the coating trough pressure of the low-pressure nozzle is at least 5, at least 50. When two coating presses of different pressures are used, they may be similar in composition and properties: or similar.

The invention will now be described with reference to some preferred embodiments of the invention shown in the figures of the accompanying drawings, to which, however, the invention is not intended to be exclusively limited.

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Figure 1 is a schematic plan view of a material coating apparatus.

Figure 2 shows, as a schematic machine direction, a first embodiment of a high beam paving slate according to the invention.

aa · 3 81641 1 Fig. 3 shows the so-called high-pressure silicon coating material of the high-beam coating slab of the web. a preferred embodiment of the bladder nozzle.

Fig. 4 shows a second embodiment of the high bellows coating device 5 in a manner similar to Fig. 2, in which, in addition to the high-pressure coating bin, the coating material is introduced along the second channel at a lower pressure.

Figure 3 shows the so-called the first embodiment of the rod cladding-10 kl as a machine direction vertical pedal section.

Figure 6 shows the so-called sauvapäällystlmen toteutusealmerkkl second embodiment, wherein the middle tllvlstyssauvan on each side is brought erlpalnelset päällyetysalneet.

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Fig. 7A shows an embodiment of the invention which corresponds mainly to the embodiment of Fig. 2, in which the nozzle of the high-pressure coating trough comprises an end part forming a wedge-shaped palm gap.

Fig. 7B shows mainly the point in the area X of Fig. 7A, where the edge of the nozzle of the high-pressure coating pan is provided with a separate te. . or tip.

Figure 1 shows a web coating device comprising a coating unit 11 against a counter roll 25 10, which is set by a positioning and loading pad 12. During coating, the web W -W is applied to the coating pad. through the nip or nips between the assembly unit 11 and the counter roll 10. The rotation of the arrow counter roll 10 and the direction of travel of the web are shown in the figure.

When referring in this application to a coating pad, 30 coating and coating pads are meant.

Figure 2 shows a vertical pedal carriage of a machine direction from a first embodiment of a high beam paving slab according to the invention. The coating mandrel comprises a rotating counter roll 10 having a smooth core roll 10 '. A web of material, e.g. a paper web W, as shown in the figure, is passed over the roll 10. A nozzle of a high-pressure coating pan, i.e. a so-called through the bladder nozzle 13 a high-pressure coating is introduced e e e • • e 4 81641 1 the filler is indicated by the arrow Lln significantly along the channel Kx. A space 14, i.e. a pressure gap, extending over the entire web plate, which may be tapered or widening in the plane of the foot slip, is distributed between the surface of the nozzle 13 of the high pressure nozzle 13 and the surface 10 'of the counter roll 10. Palneraoaaa 5 14 adheres to the surface W of the moving web of material with a high-pressure coating agent. As the collar gap narrows towards the leveling blade 17, the coating material wedges and is pressed at an even higher pressure onto the surface of the material. High-pressure coating agent Distributed in the extrudate into the material stream Llnl0 and Lln20. is an overflow of a single high pressure coating agent, and that portion of the coating agent can be recovered and recycled. The portion travels along the paper web between the leveling blade 17 and the counter roll 10, whereby part of the material is scraped down as shown by the arrow 1 ^ along the channel K2 between the nozzle 13 and the body 16. The leveling blade 17 is loaded by a load-measuring line 18. The loading hose 18 covers the internal pressure space 18a and the load hose is arranged in the space 16a of the body 16 in the space 19 and the wall of the blade 17.

The clearance 13a between the end face 13a of the pressure gap nozzle 13 and the surface 10 'of the counter roll 10 may be smaller than the clearance 15b between the end face 13a2 of the pressure gap nozzle 13 and the surface 10' of the counter roll 10. The weight range of the high-pressure PAAl · flux is 1 * 50 bar (100 * 5000 kPa), preferably; 4-20 bar (400-2000 kPa).

Figure 3 shows a preferred embodiment of a pressure gap nozzle according to the invention. The nozzle of the high-pressure coating agent, i.e. the so-called in this embodiment of the invention, the pressure gap nozzle 13 encapsulates the surfaces 13bx and 13ba against the roll of separate material. They can be, for example, made of carbide or other similar wear-resistant material.

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Fig. 4 shows an embodiment of the invention corresponding to Fig. 2. The high-pressure coating material is introduced along the channel Kt as shown by the arrows Llnl, and the high-pressure coating material is applied through the nozzle gap extending over the entire width of the ralna to the ralnasuterial. The pressure of the Kor-35 keapalna coating material is in the range of 1-50 Barla (100-5000 kPa), preferably 4-20 bar (400-2000 kPa). Part of the flow Lfei travels to the paper web with an arrow as it is directed towards the leveling blade 17 16 embankment channels Ks along the coating trough at a lower pressure to the space 24. The leveling of the coating material Lq from the blade 17 and part of the coating pressure Lln2 entering the space 24 with the arrow Lo20 esltetystl. From this state, there is an overflow flow from the gap 22 between the dam blade 21 and the counter-roll 11 of the counter-roll 10. The pressure of the high pressure coating agent in the collar gap 14 can be adjusted by changing the gap 14 between the nozzle 13 and the side roller 10. Thus, as a control measure, the nozzle 13 can be moved by moving its body 20 with the arrow Lt shown. The lowering pressure of the coating agent is 20-200 mbar (2000-20000 Pa). When different coating materials are used, the ratio of the pressure of the higher-grade coating material to the pressure of the lower-pressure coating material is at least 5, and most preferably at least 100. ·· from the intruders of the substance into the web.

• * «• · ♦ ·. ; Figure S is shown in the so-called the first implementation of the rod coating device 25 tuseslmerkkl. The device comprises a conventional coating rod 25, which e e. . extends over the entire width U of the web and is located in the groove 26a of the body 26.

The device further comprises a filling rod 27, which further extends over the entire width of the web V and is located in the groove 28a of the body 28. Between the coating rod 25 and the filling rod 27, SHARE the pressure space 29 of the high-pressure coating agent 30, into which the coating agent is introduced through the channel Ks at high pressure. Between the frames 26 and 28 there are gripping means 30. The arm • e e 31 has a joint 32 around which the frame 28 is pivoted, whereby the clearance between the sealing rod 27 and the surface 10 'of the counter roll 10 can be adjusted.

. *!. * The surface 10 'of the baling rod 25 and the counter roll 10' pressure (pressure) weather *: *. 35 is applied by pressing the entire coating unit against the roll onto the loading platform 12 (Figure 1). In the embodiment of Figure 5, the pressure of the entire applet area e: ** is high. This is due to the constant high static pressure of 6 81641 1 on the moving material base. The spread of the coating is well controlled and even.

Figure 6 shows another preferred embodiment of a rod coating tile according to the invention. The device shows a first sealing rod 34, a second filling rod 35 and a coating rod 36. The first sealing rod 34 is adapted to be located in the groove 39a of its body 39. Correspondingly, the second filling rod 35 is adapted to be located in the groove 38a of its body 38, and the coating rod 36 is arranged to be located in the groove 37a of its body 37. The filling rods and the filling rod extend over the entire width of the web. The first adjustment shield 44 engages a joint 45 around which the body 39 can be pivoted. The tightness of the body 39 against the body 38 and the adjustment of the clearance between the filling rod 34 and the pin 10 'of the counter roll 10 takes place by means of a screw device 46.

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The second arm members 47 comprise a joint 48 around which the body 37 is pivotable. Positioning of the body 37 against the middle body 38 of the second sealing rod 35 and setting of the clearance between the coating rod 36 and the surface 10 'of the counter roll 10 takes place by means of a screw device 49 or 20, respectively.

··· A high-pressure coating trough is introduced through the channel Ke of the body 39 • e e e between the first filling rod 34 and the second filling rod 35 e, ·. ; at its high pressures with 43 arrows Llnl prevented. A channel K is introduced into the pressure space 42 between the second filling rod 35 * 25 and the coating rod 36; along. high or lower pressurized coating trough with arrow Lina prevented.

• ee * * The spaces 43 and 42 are separated from each other, and the bodies 37 and 38 adjacent to the space 42 are sealed against each other by seals 41, and the bodies 39 and 40 of the high-pressure space 43 adjacent to that space are sealed against each other by the 40 In this case, the coating takes place using two different pressure surfaces, each of which has a wide-area contact surface mate-. V rlaallrainaan. Coating can first be performed in a high pressure '**. * Pressure space and then coating in a reptile pressure support, e e * ·; ·' 35 in which the fed coating can be different in composition from the material of the first pressure. When two different coatings are used, the ratio of the pressure of the higher pressure coating to the pressure of the coating material is at least 5 and the pressure of the coating material is at least 50.

Fig. 7A shows an embodiment of the kek-5 closest to the embodiment of Fig. 2. An embodiment of the figure is a high-pressure nozzle 13 provided with a pAADYST end portion 13c which tilts a surface 13c1 (the surface of which and the counter roll 10 is divided between the surface 10 'by a wedge-shaped leveling blade 17. The gap 15a for the flow Lbn is significantly longer The flow L, - · »» passes along the channel K10 out of the nozzle 13 and the dam 21 The part of the flow passes as an overflow flow Lqj0 through the clearance 21 between the dam 21 and the counter roll 10. The high pressure from the channel Ke The leveling vat stream flows with the trolley V into the leveling blade 17. The leveling vane 17 scrapes a part of the leveling basin 15 as shown by the arrow Lq into the channel Kg between the body 16 and the paving vane nozzle 13. In the Hyde tis embodiment,

Channels Kg and K10 may also have suction devices that can provide pressure to channels K9 and K10 (shown).

Figure 7B shows the area X of Figure 7A on an enlarged scale.

··· «. * J *. The end region 13c of the nozzle 13 is provided with a different width W. : with blades extending over 13c10. The blade 13c10 is preferably a flexible blade, which is loaded with its own spring force, or the blade in question can be pre-loaded. . tension with a separate load source, eg load hose, spring e e * * or the like.

30 e ·· e e e · e ·· e e · e e · e «· e e · e e e e e e · e e ·· · eee: ·: ·! 35 e · ee # e · e • e • e · *

Claims (12)

A method for coating a web of material (U) between a coating unit (11) and a counter roll (10) at high pressure, characterized in that in the coating unit (11) a coating is applied to the surface of the material web (V) running on the counter roll (10) at high pressure -50 bar (100-5000 kPa), soplvlm-min 4-20 bar (400-2000 kPa). 1 Claims Method according to Claim 1, characterized in that the high-pressure coating is introduced through the nozzle (13) and is adhered to the surface of the material web in the bead section (14) between the nozzle (13) and the surface of the counter roll (10). Method according to Claim 1 or 2, characterized in that, in addition to the high-pressure coating agent, a lower-pressure coating agent is introduced with a flake range of 20-200 mbar (2000-20000 Pa) and that the ratio of the pressure of the higher-pressure coating agent to the low-pressure coating is at least 20 mbar. at least 50. • e • e • · Method according to Claim 3, characterized in that 1. that the high-pressure coating slab is introduced into the material) ()) mouth · ·. ; through the bead gap (14) between the tongue (13) and the counter roll (10). And the low-pressure coating trough is introduced into the leveling blade (17) or the like. , with its limiting pressures (24), wherein the lower pressure coating slab (24) is in contact with the moving material web (V) over a wide area. A method according to claim 1, characterized in that the high-pressure coating is provided with a sealing and coating agent; a space (29; 43) between the rods (25, 27; 34, 35) or the like adjacent to the material area (V) moving from the wider area V. e · et e e · • 6. Device for coating the web of material. Each device comprises a coating unit (11), a counter roll (10) against the coating unit, 2 • Through which the material roll (V) is conveyed And Each device comprises at least one high-beam coating material import channel (Kx), 9 81 641 1 * means <13; K3.29; K *, ^ 3) for introducing the coating agent to the surface of the web (V) at high pressure with a bleed range of 1-50 bar (100-5000 kPa), an application of 4-20 bar (400-2000 kPa) . 5 Device according to Claim 6, characterized in that the device withstands a nozzle (13) adapted to the surface of the counter-beam (10), and that there is a narrow bellows gap (14) between the nozzle (13) and the counter-beam (10). (13) The imported high pressure coating material (Llnl) is conveyed to the cladding surface (V) of the coating tray by means of the interlocking nozzle (13) and the surface of the counter beam (10). Device according to Claim 7, characterized in that the gap 15 is tapered visually towards the frequency field (17). Device according to Claim 6, characterized in that it withstands the bustling pressure space (29) of the coating rod and the filling rod (25, 27) into which the coating material is introduced along the channel (K3). 20 Apparatus according to one of the preceding claims 6 to 9, characterized in that there is a second channel (K3) through which the coating agent (LlnZ) is introduced at a lower pressure in the pressure range of the coating agent; at 20-200 mbar (2000-20000 Pa) and the equipment does not withstand the leveling nozzle (17) and the nozzle of the high-pressure coating agent (13) Velinen. . to fill the space (24) of the coating material bounded over a wide area by its material base (W). Device according to Claim 6, characterized in that the device does not withstand the first and second filling rods (34, 35) of the Velor high bellows (43) and the second filling rod (35) and the bellows (36). (43) *. * The coating agent is introduced along the channel (K ^) Je to which other pallet space • e> (42) the coating agent is introduced along the channel (K7). 35 e · Device according to Claim 7, characterized in that the nozzle (13) of the high-pressure coating agent does not cover the tongue (13c10) which presses against the surface of the counter roll (10). 10 81 641