• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The production of a three-layer fibrous web, such as White Top Liner (WTL), is carried out by first producing a two-layer fibrous web (W) in a forming section (1) comprising a two-layer bake (6) and a gap or a hybrid former , The two-layer fibrous web (W) is passed through a press section (2), which comprises 1 to 3 press nips (N1, N2), of which at least one is designed as a broad nip press. In the last press nip (N2) of the press section (2), the top of the web (W) is pressed against a smooth surface. By the last press nip (N2) possibly preceding press nips (N1), the web (W) in each case between two felts (7, 9) is located befindlich. Behind the press section (2), the fibrous web (W) in a cylinder drying section (3) is dried, painted the top of the fibrous web (W) by the Florstreichverfahren and the coated fibrous web (W) equipped by calendering.
    公开号:AT511561A2
    申请号:T5872012
    申请日:2012-05-16
    公开日:2012-12-15
    发明作者:Hannu Turpeinen；Jussi Jaeaeskelaeinen；Sami Anttilainen
    申请人:Metso Paper Inc；
    IPC主号:
    专利说明:

    The invention relates to a method and a production line for producing an at least three-ply paper or board web. The process and production line are particularly suitable for the production of white topcoat (WTL, i.e. White Top Linerboard) liners.
    Liner with white topcoat, hereafter referred to as WTL, is used as a corrugated cardboard top layer for packaging materials that require good printing properties such as smoothness and brightness. WTL typically comprises two or three layers: a base layer consisting, for example, of unbleached pulp or recycled cardboard (OCC, ie Old Corrugated Container), an optional intermediate layer containing, for example, deinked waste paper pulp (DIP, ie deinked pulp), as well as a top, ie Covering layer, which generally consists of bleached softwood or hardwood pulp. The proportion of bleached pulp in the liner raw material costs is generally significant. To save costs, one seeks to make liners using an intermediate layer which forms a protective layer between the brown and white layers.
    To produce the three-layer WTL, a separate screening unit and a separate headbox are required for each layer, with the individually produced material webs being joined together at the end of the wire section. The bleached pulp topcoat containing pulp and filler is made in a separate screen unit. • * -2 4 · · · * * »* · · · * * *« ··· «» ·· «« 4 · * * · 4 · · · · «
    The document EP 1 218 593 A1 describes such a prior art paper machine for producing at least two layers of liner. The paper machine comprises a bottom wire unit for forming the liner base layer and a top wire unit for forming the liner top layer. The forming section is followed by the press section, in which the upper side of the liner top layer comes to rest against a smooth transfer belt, at least in the last nip. The top of the web gets so good smoothness for printing. The cover layer is made of bleached pulp. The railway is neither painted nor calendered. The use of two separate screening units is costly.
    The document WO 2005095711 A1 describes a method for producing a coated fibrous web, in which the base layer (raw web) is treated with a Yankee cylinder or by metal belt drying and / or pre-calendering and / or pre-coating before the actual coating. The green sheet is painted by the curtain coating method and then treated in at least one additional process selected from the group comprising soft calenders, belt calenders, metal belt calenders, supercalenders, multi-roll calenders with polymer rolls, shoe calenders and brush calendering. The idea with this method is to replace the bleached topcoat with a pigmented layer formed by curtain coating. The script does not explain whether the
    • «* ·« ··· ♦ · · · »# I · ι · · · ·« ·
    Uncoated single or multi-layered and how it has been produced.
    Object of this invention is to provide a new and compared to previously more advantageous method for producing a multilayer material web. Furthermore, the quality and the manufacturing process of the intended for the Florstreichen paper or board web to be optimized. Characteristic of the method according to the invention is what is stated above in the characterizing part of patent claim 1.
    Accordingly, for the inventive production line characterizing what is stated above in the characterizing part of claim 3.
    According to the invention, the base and back layers of the multilayer web are made using a two-layer bake and a gap or hybrid former. The top, i. Top layer of the web is produced by the Florstreichtechnik.
    The headbox may consist of a multi-layer headbox equipped with a so-called water wedge, as known from FI 113287 B. In this headbox, an insulating medium layer is fed between the fabric layers, which can contain water and various chemicals and keeps the individual fibrous layers apart, the mutual
    Blending the fibers reduces and improves the layer purity of the web.
    The drainage on two sides down to the
    Twin-wire section of the gap or hybrid former brings a further improvement in the layer purity of the web.
    Behind the wire section, the fibrous web is treated in a 1 to 3 nips, preferably 2 nips series press, wherein the last press nip is arranged so that the top of the web comes to rest against a smooth surface. This smooth surface can consist of a smooth roll with the web being fed in an open draw into the dryer section, or of a smooth-faced felt-like fabric or an impermeable belt which transports the web from the last nip into the dryer section. The band may consist of a transfer belt or a metal band. The metal band may be equipped with a heater. The remaining press nips, possibly preceding the last press nip, are double felt nips, i. the web will be between two felts, guided by these nips. Preferably, at least one of these presses consists of a nip press, which is formed by a shoe roll and its counter-roller.
    Behind the press section, the web is preferably dried in a cylinder dryer section.
    If required, the web can be precalendered behind the dryer section, after which a cover layer is applied to the two-layered web in accordance with the curtain coating method.
    After the Florstreichen receives the now three-layered web in the calender her finish.
    As advantages of Florstreichens u. a. the uniform coating layer and the ability to apply multiple layers at once. The Florstreichen requires a smooth, uniform surface of the raw web. If necessary, the raw web before the Florstreichen a precoat, for example, obtained by doctor blade.
    The two-layer headbox in conjunction with a suitable sheet forming technique enables energy-efficient production of a two-layer web.
    In the last press nip receives the raw web through the coming to rest against their top smooth surface a good smoothness, whereby the possibility of achieving a good layer purity of the top layer is given in Florstreichen.
    The production of the cover layer by Florstreichen the fibrous web with pigment paste saves fiber raw material. Processes of the wet end of the paper machine are also simplified when the processes required in the wet end for the production of the top layer are replaced by delineation. The cover layer, i. the coating does not need to contain any bleached pulp. Furthermore, this solution reduces the need for drainage in the wire and press sections.
    The production line according to the invention enables the production of three-layer paper and board grades with considerably more compact machine equipment of the wet end than hitherto. This means considerable energy savings in the headbox feed system, as the reduced flow of material and water results in correspondingly lower pumping capacities. Even dry energy is saved, because the production of the cover layer can be done by the coating technique with considerably higher consistency than before.
    In the following, the invention will be described with reference to the accompanying drawings, to which, however, the invention should not be limited.
    Fig. 1 shows the forming and the press section and the front part of the dryer section of a linerboard machine.
    Fig. 2 shows liner finishing stages in principle.
    The linerboard machine illustrated in FIG. 1 comprises a forming section 1, a press section 2 and a dryer section 3, of which only the front section is shown here. The Formierpartie 1 comprises a headbox 6 and a lower wire 4 and a top wire 5, each forming a defined by guide rollers endless loop. The lower sieve 4 forms a short Langsiebabschnitt on which a Untersieb 4 and
    • V -7- * * * · * * * + 44 * * * * * * # vv * · * * · · t »» · · · · 4 · * 4 · * «« · 4 · 4 4
    Upper sieve 5 formed twin-wire section follows. The headbox 6 preferably consists of a flow-controlled two-layer casserole.
    The fiber suspension is applied from the headbox 6 to the wire section of the lower wire 4 and dewatered down through the lower wire 4 by means of various dewatering elements (omitted in the drawing). On the adjoining the wire section twin wire section of the fiber suspension through the lower wire 4 down through and through the top wire 5 up through with the help of the sieve loops 4, 5 arranged (omitted in the drawing) drainage elements further water withdrawn. Behind the twin-wire section, the web W, carried by the lower wire 4, continues on its way to the transfer point, where it is guided from the upper side of the lower wire 4 into the first press of the press section 2.
    The press section 2 comprises two successive presses which form two separate press nips NI, N2. The first press is formed by the top felt loop 7, the first press roll 8 located inside this loop, the first underfelt loop 9 and the second press roll 10 located inside this loop. The second press is from the
    Metal strap loop 11, which formed within this loop third press roll 12, the second lower loop felt 13 and located within this loop fourth press roll 14 is formed. At t * * »« »mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm.............. »· · ·« · · ·
    End of the press section 2 is still a separate transfer screen 15, with which the web is transported from the press section 2 in the dryer section 3.
    The outgoing from the Formierpartie 1 web W is transferred with a transfer suction from the top of the lower wire 4 to the underside of the upper felt 7. Together with the top felt 7, the web W is led to the first press nip NI, which is located between the top felt 7 and the first bottom felt 9. Behind the nip NI, the web W travels a certain distance between the felts 7, 9 until it is detached from the bottom felt 9 by means of a transfer suction roll arranged on the side of the top felt 7. The web now follows the top felt 7, from which it is lifted off with a transfer suction roll and brought to the top of the bottom felt 13 of the second press. Supported by the second underfelt 13, the web W is guided into the second press nip N2, where the top of the web W comes to lie against the smooth metal band 11. Behind the nip N2, the web W, adhering to the underside of the metal strip 11 continues its way to the transfer point, where it is brought from the bottom of the metal strip 11 on the top of the transfer screen 15. Carried by the transfer screen 15, the web W is transferred from the press section 2 in the dryer section 3.
    The metal band 11 has a smooth
    Surface texture, is substantially water and airtight and has in its circulation a heater 24, with which it can be brought to the desired temperature. By heating the metal strip 11 is -. • * * * · · ι * * · 9 · I * * * * »» «* ***** ··· * · f» »• · · · I * the drainage in the second press nip N2 reinforced and the temperature of the web before its transition into the dryer section 3 increases. The smooth metal strip 11 comes to lie in the last press nip N2 of the press section 2 against the top of the web W, so that the outgoing from the press section web W has a smooth top.
    Instead of the metal strip 11, a smooth-surfaced felt-like fabric or a transfer belt can be used, which gives the top of the web the required smoothness. Alternatively, the metal band 11 may be replaced by a smooth roller inserted in the position of the press roller 12.
    To intensify the drainage, at least one of the press rolls 8, 10, 12, 14 of the press section 2 preferably consists of a shoe roll, in which case at least one of the press nips Nl, N2 has a broadened dewatering and press zone.
    The dryer section 3 starts with a
    Drying cylinder group comprising a drying wire 16, at least two arranged in the top row drying cylinder 17 and at least one disposed in the lower row guide roller 18. It is possible to have the web W entirely, i. Dry exclusively by cylinder drying.
    Fig. 2 shows in principle the finishing of the web W behind the dryer section either in the paper machine (online) or separately from this (offline). The web W becomes the
    Improvement of the smoothness of the side to be painted before the Florstreichen passed through a pre-calender 20. This pre-calender may alternatively be omitted if the side of the web to be painted already has sufficient smoothness. On the upper side of the web W, a coating layer of a desired thickness is applied with the film coating device 21. The coated side of the web is dried with a non-contact drying device 22; Thereafter, the coated web W is passed through the Endkalander 23.
    With the production line according to the invention can be produced in a simple and advantageous manner, a three-layer fibrous web whose cover layer has good printability. The two-layered green sheet can be made with a (single) forming section without a top wire unit, good smoothness can be imparted to the top of the sheet to be painted in the press section, and after drying, the smooth top surface of the web can be painted by the curtain coating method. The patterning can be done either online, i. in connection with the fiber web machine, or offline as a separate process, separated from the fiber web machine done. If necessary, the web can be given a pre-coat before it is painted. The side of the web opposite the side to be painted can optionally be surface-glued. Although all of these measures are known per se, their combination and the resulting synergy have not been known.
    Numerous different variations of the invention are possible in the context defined by the claims set forth below.
    claims
    权利要求:
    Claims (8)
    [1]
    -1 • · * *

    DR. FERDINAND GIBLER DR DR. WOLFGANG POTH Austnan and European Patent and Trademark Attorneys GIBLER & POTH PATENTANWÄLTE 33731 / ab Claims 1. A process for producing an at least three-ply material web, in particular White Top Liner (WTL), characterized in that it comprises steps in which a) a two-layer fibrous web (W) is formed in a forming section (1) comprising a two-layer headbox (6) and a gap former or a hybrid former, b) the fibrous web (W) is conveyed through a press section (2) which comprises 1 to 3 press nips (N1, N2), at least one of which is designed as a broad nip press, wherein in the last press nip (N2) of the press section (2) the top of the web <W) is pressed against a smooth surface , and wherein the web {W) is passed through the press nips (Nl) possibly preceding the last press nip (N2) between two felts (7, 9), c) the fibrous web {W) in egg a cylinder drying section (3) is dried, d) the top of the fibrous web (W) receives a spread after the Florstreichverfahren, and -2

    e) the coated fibrous web (W) is equipped by calendering.
    [2]
    2. The method according to claim 1, characterized in that according to this method White Top Liner (WTL) is prepared, which comprises a base material consisting of fiber material, an existing thereon, consisting of fibrous material cover layer and on this one produced by Filstreichen pigment layer.
    [3]
    3. Production line for producing an at least three-layer material web, in particular White Top Liner (WTL), characterized in that the production line a) a Formierpartie (1) comprising a two-layer casserole (6) and two Formiersiebe (4, 5), the one B) a press section (2) with 1 to 3 press nips (NI, N2), of which at least one is designed as a broad nip press, wherein in the last nip (N2 ) of the press section (2) the upper side of the web (W) comes to lie against a smooth surface, and wherein the web (W) through the last nip (N2) possibly preceding press nips (NI) in each case between two felts (7, 9 c) a cylinder drying section (3) for drying the web (W) coming from the press section (2), d) a curtain coating device (21) for coating the upper side of the web (w), and e) a Ka lander (23) for calendering the coated web (w).
    [4]
    4. Production line according to claim 3, characterized in that the web (W) is arranged for passing through the last nip (N2) of the press section (2) that the top of the web (W) comes to rest against a smooth surface, the may consist of the surface of a roller, a belt or a fabric.
    [5]
    5. Production line according to claim 4, characterized in that said smooth surface consists of the surface of a band (11) or a fabric and the band (11) or the fabric is adapted to the web (W) behind the last nip (N2) from the press section (2) in the cylinder drying section (3) to transport.
    [6]
    6. Production line according to claim 5, characterized in that said smooth surface of the surface of a metal strip (11), which is combined with a heating device (24) for heating the metal strip (ll).
    [7]
    A production line according to any one of claims 3 to 6, characterized in that the web (W) is passed through a pre-calender (20) in front of the curtain coater (21).
    [8]
    The production line according to any one of claims 3 to 7, characterized in that the two-layer headbox (6) comprises means for introducing an insulating medium layer between the fibrous layers.

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    同族专利:
    公开号 | 公开日
    FI20115486A0|2011-05-19|
    AT511561B1|2015-12-15|
    AT511561A3|2015-10-15|
    DE102012208171A1|2012-11-22|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    FI110274B|1996-11-04|2002-12-31|Metso Paper Inc|Method and apparatus for coating a moving cardboard web|
    SE514973C2|1999-09-07|2001-05-21|Valmet Karlstad Ab|Method and paper machine for making a liner|
    FI20045110A|2004-03-30|2005-10-01|Metso Paper Inc|Process for making coated fiber web|
    DE102008000134A1|2008-01-23|2009-07-30|Voith Patent Gmbh|Method and device for producing coated papers|WO2016083173A1|2014-11-28|2016-06-02|Voith Patent Gmbh|Device for producing a fibrous web|
    DE102015223662A1|2015-11-30|2017-06-14|Voith Patent Gmbh|Apparatus for producing a fibrous web|
    DE102015223664A1|2015-11-30|2017-06-01|Voith Patent Gmbh|DEVICE AND METHOD FOR PRODUCING A FIBROUS WEB|
    DE102015223663A1|2015-11-30|2017-06-01|Voith Patent Gmbh|DEVICE FOR PRODUCING A FIBROUS WEB|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FI20115486A|FI20115486A0|2011-05-19|2011-05-19|Process and production line for the manufacture of multilayer web|
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