FI90265C

FI90265C - Device for gluing a moving fibrous web

Info

Publication number: FI90265C
Application number: FI910236A
Authority: FI
Inventors: Jens Remmer
Original assignee: Tampella Papertech Oy
Priority date: 1991-01-16
Filing date: 1991-01-16
Publication date: 1994-01-10
Also published as: FI910236A0; FI910236A; FI90265B

Description

! 90265! 90265

Laite liikkuvan kuiturainan liimaamiseksiDevice for gluing a moving fibrous web

Keksinndn kohteena on laite liikkuvan kuiturainan liimaamiseksi, jossa laitteessa on liiman annosteluvåli-5 neet liiman levittamiseksi kuiturainan molemmille puolille ja ainakin yhden telan kasittava puristin, jonka låpi kui-turaina johdetaan liiman puristamiseksi rainan pinnalta sen sisåån.The invention relates to a device for gluing a moving fibrous web, the device having glue dispensing means for applying glue to both sides of the fibrous web and a press for passing at least one roll, through which the fiber web is passed to press the glue from the surface of the web.

Kuiturainaa valmistettaessa ja erityisesti karton-10 kia valmistettaessa siihen usein pyritåån imeyttåmåån lii-maa, jotta siita saataisiin riittavån luja aiottuun tar-koitukseen. Liima levitetåån tyypillisesti niin, ettå se levitetåån nestemåisenå rainan pinnoille ja erilaisin pu-ristimin koitetaan saada tunkeutumaan pinnalta syvemmålle. 15 Tållainen ratkaisu on tunnettu muun muassa Fl-patenttiha-kemuksesta 851765, FI-kuulutusjulkaisusta 64202, US-paten-tista 4,407,227 ja US-patentista 4,407,224.In the manufacture of fibrous webs, and in particular in the manufacture of paperboard, it is often attempted to absorb the adhesive in order to make it sufficiently strong for the intended purpose. The adhesive is typically applied by applying it in liquid form to the surfaces of the web and attempting to penetrate deeper from the surface with various presses. Such a solution is known, inter alia, from F1 patent application 851765, FI publication 64202, U.S. patent 4,407,227 and U.S. patent 4,407,224.

Kyseisisså julkaisuissa esitetyisså ratkaisuissa liima syiitetåån rainan molemmille puolille erilaisilla 20 kaukaloratkaisuilla niin, etta liimaa on allasmaisesti rainan kummallakin sivulla ja raina vie menness&ån liimaa telojen muodostaman puristinnipin låpi, jolloin rainan pinnassa olevaa liimaa puristuu sen rakenteen sisaan. Tun-netuissa ratkaisuissa haittapuolena on, ettå liimaa siir-25 tyy rainan mukana vain tietty måSrå, koska sita ei pakolla voida syottåå rainan mukaan enempåå, kuin se vie mennes-såån. Edelleen ratkaisun heikkoutena on, etta rainan tul-lessa puristinnippiin osa liimasta tyOntyy takaisin, koska ... se ei kykene puristumaan rainan sisaan puristinnipissa.In the solutions presented in these publications, the adhesive is applied to both sides of the web by different trough solutions so that the adhesive is pool-like on each side of the web and the web passes the adhesive through a press nip formed by the rolls. The disadvantage of the known solutions is that the adhesive is transferred with the web only in a certain amount, because it cannot be fed into the web more than it takes. A further weakness of the solution is that when the web enters the press nip, part of the adhesive is pushed back because ... it is not able to press inside the web in the press nip.

30 Edelleen tunnetuilla ratkaisuilla heikkoutena on, etta liiman tunkeutuma rainan paksuussuunnassa jaa varsin pie-neksi eika koko raina siten muodostu riittåvan vahvaksi.A further disadvantage of the known solutions is that the penetration of the adhesive in the thickness direction of the web divides quite small and the whole web thus does not become strong enough.

Taman keksinnOn tarkoituksena on saada aikaan sel-lainen laitteisto, jolla valtetaån edelia esitettyja han-35 kaluuksia ja jolla liiman tunkeutuminen rainaan saadaan 2 90265 huomattavasti nykyisia paremmaksi. Keksinnttn mukaiselle laitteelle on ominaista, etta puristimessa on telaan pain painautuva ja sen puoleiselta pinnaltaan kovera puristin-kenkS ja puristinkengSn koveraa pintaa vasten liukuva ja 5 puristinkengån ympåri suljetun silmukan muodostava nestet-ta lapaisemåtOn liukunauha, jolloin kuituraina johdetaan puristimen lapi liukunauhan ja telan vaiissa.The object of the present invention is to provide an apparatus which overcomes the above-mentioned features and which makes the penetration of the adhesive into the web considerably better than at present. The device according to the invention is characterized in that the press has a roll-pressable and concave press-shoe and a press-sliding surface on its side sliding against the concave surface of the press-shoe and forming a closed loop around the press-shoe.

Keksinnttn olennainen ajatus on, etta liima syttte-taan rainan molemmille puolille sopivasti annosteltuna ja 10 liimalla pinnoitettu raina johdetaan pitkavytthykepuristi-men lapi, jolloin puristusaika on huomattavasti nykyisia ratkaisuja pidempi ja liima saadaan mahdollisinunan tehok-kaasti tunkeutumaan rainaan niin, etta siita saadaan olen-naisesti lapiliimattua ja siten ominaisuuksiltaan nykyi-15 siin ratkaisuihin nahden merkittavasti parempaa.The essential idea of the invention is that the adhesive is ignited on both sides of the web in a suitably dosed manner and the adhesive-coated web is passed through a long-jet press, whereby the pressing time is considerably longer than current solutions and the adhesive can be effectively penetrated into the web. glued and thus significantly better in terms of properties compared to current-15 solutions.

KeksintttM selostetaan ldhemmin oheisissa piirustuk-sissa, joissa kuvio 1 esittaa kaavamaisesti keksinnttn mukaista laitetta, 20 kuviot 2a - 2c esittavat kaavamaisesti liiman tun- keutumista paksuun kuiturainaan toisaalta tunnetulla tek-niikalla ja keksinnon mukaisella laitteella.The invention will be described in more detail in the accompanying drawings, in which Figure 1 schematically shows a device according to the invention, Figures 2a to 2c schematically show the penetration of an adhesive into a thick fibrous web by means of the prior art and the device according to the invention.

Kuviossa 1 on esitetty keksinnttn mukainen laite, jossa on lammittamatttn puristustela 1 ja sita vastaan pu-25 ristuva telan 1 puoleiselta pinnalta kovera puristuskenka 2. Telan 1 ja kengan 2 vaiista kulkee liimattava raina 3 seka liukunauha 4, joka kiertaa kengan 2 seka telojen 5 ympari muodostaen suljetun silmukan. Edelleen laitteessa on liimanannostelulaitteet 6 ja 7, jotka annostelevat lii-' 30 maa telan 1 pinnalle ja liukunauhan 4 pinnalle ennen pu-ristusvytthyketta niin, etta sita tulee rainan 3 molemmin puolin. Rainan 3 ja nauhan 4 liikkuessa kengan 2 ja telan 1 muodostaman puristusvytthykkeen lapi liima puristuu rainaan 3 sen pinnalta sen sisaan molemmilta puolilta pitkan 35 aikaa eli koko puristusvytthykkeen pituudella, jolloin seFigure 1 shows a device according to the invention with an unheated press roll 1 and a concave press shoe 2 which is concave against it on the side of the roll 1. A web 3 to be glued and a conveyor belt 4 pass around the shoe 2 and rolls 5. forming a closed loop. Furthermore, the device has adhesive dispensing devices 6 and 7, which dispense the adhesive on the surface of the roll 1 and on the surface of the conveyor belt 4 before the pressing cavity so that it comes on both sides of the web 3. As the web 3 and the strip 4 move along the compression cavity formed by the shoe 2 and the roll 1, the adhesive is compressed on the web 3 from its surface inside it on both sides for a long time 35, i.e. along the entire length of the compression cavity, whereby it

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3 90265 tunkeutuu rainaan olennaisesti koko rainan paksuudelta. Puristinvydhykkeen jaikeen raina 3 erotetaan nauhasta 4. Liimakerroksen paksuuden pitamiseksi sopivana liima sydte-taan telalle 1 tai nauhalle 4 lahellå puristusvydhyketta 5 samalla, kun sen paksuus saadetaan kaavaimella tms. sindn-sa tunnetulla laitteella. Vastaavasti ylimaaråinen liima poistetaan puristusvydhykkeen jålkeen nauhalta 4 esimer-kiksi kaavarin 8 avulla ja tarvittaessa huuhtomalla sitå ei esitetyilia vesisuihkuilla.3,90265 penetrates the web over substantially the entire thickness of the web. The web 3 of the fraction of the press zone is separated from the strip 4. In order to keep the thickness of the adhesive layer suitable, the adhesive is applied to the roll 1 or the strip 4 near the press zone 5 while obtaining its thickness with a stencil or similar device known in Sind. Correspondingly, the excess adhesive is removed from the strip 4 after the pressing zone, for example by means of a scraper 8 and, if necessary, by rinsing it with water jets not shown.

10 Liimanannostelulaitteet 6 ja 7 voivat olla niin sanottuja SDTA-tyyppisiS, jolloin liiman tasoitus tapahtuu sinanså tunnetulla tavalla esimerkiksi profiilivalssatulla sauvalla. Toisena vaihtoehtona liiman syottamiseksi olisi pintaliiman vapaa sydttd esimerkiksi manifold-putkistolla 15 ennen puristinnippia, jolloin liika liima virtaisi reuna-laatikkoihin ja palautettaisiin annosteltavaksi uudelleen.The adhesive dispensing devices 6 and 7 can be of the so-called SDTA type, in which case the leveling of the adhesive takes place in a manner known per se, for example with a profile-rolled rod. Another alternative for feeding the adhesive would be a free core of surface adhesive, for example in manifold piping 15 before the press nip, whereby excess adhesive would flow into the edge boxes and be returned for re-dosing.

Kuviossa 2a ja 2c on esitetty kaavamaisesti tunnetulla tekniikalla aikaansaatu liiman tunkeuma seka keksin-non mukaisella ratkaisulla aikaansaatu liiman tunkeuma 20 kartonkiin. Kuviossa 2a on esitetty ns film-transer-puris-timen avulla aikaansaatu tunkeuma, jolloin kuviossa nåkyy, ettå liimaa on tunkeutunut rainan 3 pintaan sen molemmin puolin vain varsin kapeat vydhykkeet 9a ja 9b. Sen sijaan rainan keskiosa on jSSnyt liimaamattomaksi ja nSin olien 25 kartongin lujuus on riittåva pinnoissa, mutta keskiosa liimaamattomana on pehmeampi ja si ten heikentaå kartonkia.Figures 2a and 2c show schematically the adhesion penetration provided by the prior art and the adhesive penetration 20 into the board provided by the solution according to the invention. Fig. 2a shows the penetration provided by the so-called film-transer press, in which case it can be seen that the adhesive has penetrated the surface of the web 3 on both sides thereof only quite narrow zones 9a and 9b. On the other hand, the middle part of the web has remained non-glued and the strength of the cardboard is sufficient on the surfaces, but the central part without gluing is softer and thus weakens the board.

. Kuviossa 2b on esitetty vastaava liiman tunkeuma kayttåen tavanomaista liimapuristinta, jossa tunkeuma on jonkin verran suurempi kuin kuvion 2a mukaisessa ratkaisussa, 30 mutta edelleen suhteellisen huono, koska kartongin keskiosa jaa edelleen liimaantumatta. Kuviossa 2c on esitetty lopputulos keksinndn mukaisella ratkaisulla toteutettuna, jolloin nakyy, etta liimaus ulottuu koko kartongin paksuu-delle ja siten koko kartongin lujuus ja muut ominaisuudet 35 ovat hyvåt ja tasaiset.. Fig. 2b shows a corresponding adhesive penetration using a conventional adhesive press, in which the penetration is somewhat higher than in the solution according to Fig. 2a, but still relatively poor, because the middle part of the board still divides without gluing. Figure 2c shows the result implemented with the solution according to the invention, whereby it can be seen that the gluing extends over the entire thickness of the board and thus the strength and other properties 35 of the whole board are good and even.

4 902654,90265

EdellS selityksessa ja piirustuksissa on keksintaa selostettu vain esimerkinomaisesti eika sita ole miliaan tavalla rajoitettu siihen. Nauha 4 voi olla valmistettu joko teraksesta, polymeerimateriaalista tai muusta 5 sopivasta mitoiltaan suhteellisen stabiilina pysyvasta materiaalista. Liiman annostelu voi tapahtua paitsi kuviossa esitetylia SDTA-annostelijalla, mybs milia tahansa muulla sinansa tunnetulla liimanannostelulaitteistolla, jota voidaan kayttaa ratkaisun yhteydessa. Olennaista on, 10 etta rainan molemmille puolille tulee puristinvybhykkeen alkaessa riittava maara liimaa, joka kulkee puristinvybhykkeen lapi joutuen samalla puristusvaikutuksen alaiseksi rainaan pain ja siten tunkeutuu rainaan olennaisesti koko sen paksuudelle.In the foregoing description and drawings, the invention has been described by way of example only and is not limited thereto. The strip 4 may be made of either steel, polymeric material or other suitable material 5 which remains relatively stable in dimensions. The adhesive can be dispensed not only with the SDTA dispenser shown in the figure, but also with any other adhesive dispensing equipment known per se which can be used in connection with the solution. It is essential that, on both sides of the web, a sufficient amount of glue enters both sides of the press assembly, which passes through the press assembly while at the same time being pressed against the web and thus penetrating the web over substantially its entire thickness.

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Claims

5,90265

An apparatus for gluing a movable fibrous web (3), the apparatus comprising glue dispensing means (6, 7) for applying glue 5 to both sides of the fibrous web (3) and a press for passing at least one roll (1) through which the fibrous web (3) is passed for pressing the adhesive from the surface of the web (3) into it, characterized in that the press has a pressure press (2) pressed against the roll (1) and a concave press shoe (2) on its side and sliding against the concave surface of the press shoe (2) and closed around the press shoe (2) a liquid-impermeable sliding belt (4) forming a loop, wherein the fibrous web (3) is passed through the press between the sliding belt (4) and the roll (1).

Device according to claim 1, characterized in that the adhesive dispensing means (6, 7) are mounted to dispense the adhesive to be pressed onto the web (3) on the surface of the roll (1) and the strip (4) on the web (3) side before the roll (1) and a compression zone formed by the press shoe (2) 20. 6 90265