SE537870C2

SE537870C2 - Device for preventing a paper web from lifting from the wire

Info

Publication number: SE537870C2
Application number: SE1300313A
Authority: SE
Inventors: Roger Bengtsson
Original assignee: Stora Enso Oyj
Priority date: 2013-04-29
Filing date: 2013-04-29
Publication date: 2015-11-03
Also published as: SE1300313A1; WO2014178002A1

Abstract

SAMMANDRAG Den fOreliggande uppfinningen avser en anordning for att hindra en pappersbana (5), som transporteras pa en 1opande vira (2), fran att lyfta fran viran (2), varvid en bankant (19) av pappersbanan har avskurits fran pappersbanan av en kantsprits (9). Anordningen innefattar ett barplan (10) som innefattar en barplansyta (11) som är vand mot viran (2) och är anordnad pa sa satt att barplansytan leder en luftstrom fran den lopande viran (2) i en ny riktning for att generera ett undertryck som hindrar pappersbanan fran att lyfta. SUMMARY The present invention relates to a device for preventing a paper web (5), which is transported on an opening wire (2), from lifting from the wire (2), a bank edge (19) of the paper web being cut off from the paper web by an edge spirit. (9). The device comprises a bare plane (10) which comprises a bare plane surface (11) which is water against the wire (2) and is arranged such that the bare plane surface directs an air flow from the running wire (2) in a new direction to generate a negative pressure which prevents the paper web from lifting.

Description

ANORDNING FOR ATT HINDRA EN PAPPERSBANA FRAN ATT LYFTA FRAN EN VIRA Den foreliggande uppfinningen avser en anordning for att hindra en pappersbana, som transporteras pa en lopande vira, fran att lyfta fran viran, varvid en bankant av pappersbanan har avskurits frAn pappersbanan av en kantsprits. The present invention relates to a device for preventing a paper web, which is transported on a running wire, from lifting from the wire, a bank edge of the paper web having been cut off from the paper web by an edge cut.

I virapartiet hos en pappersmaskin transporteras pappersbanan pA en lopande vira mot pappersmaskinens pressektion. Vid slutet av virapartiet skars atminstone en bankant av pappersbanan bort fran pappersbanan av en kantsprits. Kantspritsen är placerad Over pappersbanan och anvander vattenstralar med hogt tryck for att skara igenom pappersbanan. Ett problem vid skarning är att den skurna kanten av pappersbanan har en tendens att lyfta uppat, vilket i sin tur kan fororsaka kantbrott i pappersbanan. Normalt är en vakuumsuglada placerad under viran, efter kantspritsen, for att hindra den skurna kanten och pappersbanan fran att lyfta uppat fran viran. In the wire section of a paper machine, the paper web is transported on a running wire towards the press section of the paper machine. At the end of the wire section, at least one bank edge of the paper web is cut away from the paper web by an edge spirit. The edge spreader is placed over the paper web and uses high pressure water jets to cut through the paper web. A problem with cutting is that the cut edge of the paper web has a tendency to lift upwards, which in turn can cause edge breaks in the paper web. Normally, a vacuum suction cup is placed under the wire, after the edge spray, to prevent the cut edge and the paper web from lifting upwards from the wire.

Vakuumsugladan är dock forknippad med vissa stora nackdelar. Vakuumsugladan ãr dyr, bade att kopa in och att anvanda, beroende pa dess hoga energiforbrukning. Vakuumsugladan är dven komplicerad i sin konstruktion och kraver underhall. Dessutom kan vakuumladan Oven leda till notande forslitning av viran. However, the vacuum sucker is associated with some major disadvantages. The vacuum vacuum is expensive, both to buy and to use, due to its high energy consumption. The vacuum suction cup is complicated in its construction and requires maintenance. In addition, the vacuum charge Oven can lead to noticeable wear of the wire.

Ett syfte med den foreliggande uppfinningen Or att tillhandahalla en anordning som kommer att sakerstalla att bade den skurna kanten av pappersbanan och den avskurna bankanten pressas mot viran. I jamforelse med vakuumsugladan kommer anordningen att bli enklare i sin konstruktion, billigare och kraver inget eller Atminstone mindre underhall. 1 Anordningen enligt uppfinningen kannetecknas av att anordningen innefattar ett bdrplan som innefattar en barplansyta som är vand mot viran och är anordnad pa sá sdtt att barplansytan leder en luftstrom fran den lOpande viran i en ny riktning for att generera ett undertryck som hindrar pappersbanan fran att lyfta. An object of the present invention is to provide a device which will ensure that both the cut edge of the paper web and the cut bank edge are pressed against the wire. In comparison with the vacuum suction cup, the device will be simpler in its construction, cheaper and requires no or at least less maintenance. The device according to the invention is characterized in that the device comprises a floor plane which comprises a bare plane surface which is water against the wire and is arranged such that the bare plane surface directs an air flow from the running wire in a new direction to generate a negative pressure which prevents the paper web from lifting .

I det foljande kommer uppfinningen att beskrivas i en foredragen utforingsform med hanvisning till ritningarna, dar: Figur 1 visar ett viraparti hos en pappersmaskin, dar en anordning enligt uppfinningen är anordnad for att hindra en skuren kant av en pappersbana fran att lyfta uppat fran en vira. In the following, the invention will be described in a preferred embodiment with reference to the drawings, in which: Figure 1 shows a wire portion of a paper machine, where a device according to the invention is arranged to prevent a cut edge of a paper web from lifting upwards from a wire .

Figur 2 visar en vy uppifran av figur 1. Figure 2 shows a view from above of figure 1.

Figur 3 visar ett barplan i profil. Figure 3 shows a bare plane in profile.

Figur 4 visar bdrplanet i perspektiv. Figure 4 shows the floor plan in perspective.

Figur 5 visar ett installningsorgan for installning av laget has barplanet. Figure 5 shows an installation means for installing the layer has the bar plane.

Figur 1 och 2 visar ett viraparti has en pappersmaskin. Virapartiet 1 innefattar en lopande vira 2 for transport av en pappersbana 5. Viran 2 har en forsta yta 3 som dr vand uppat och en andra yta 4 som Or vand nedat och bort fran den fOrsta ytan 3. Figures 1 and 2 show a wire section having a paper machine. The wire portion 1 comprises a running wire 2 for transporting a paper web 5. The wire 2 has a first surface 3 which draws water upwards and a second surface 4 which draws water downwards and away from the first surface 3.

Virapartiet 1 innefattar dessutom den ovannamnda pappersbanan 5. Pappersbanan har en fOrsta yta 6 som Or vand uppat och en andra yta 7 som Or vand bort fran den fOrsta ytan 6. Den andra ytan 7 av papperbanan 5 Or i fysisk kontakt med den fOrsta ytan 3 av viran 1, pa grund harav transporteras pappersbanan 5 av den lopande viran 2 2. Vid anvandning har viran en hastighet fran ungefar 500 m/min och hogre. The wire portion 1 further comprises the above-mentioned paper web 5. The paper web has a first surface 6 which is water up and a second surface 7 which is water away from the first surface 6. The second surface 7 of the paper web 5 is in physical contact with the first surface 3 of the wire 1, due to which the paper web 5 is transported by the running wire 2 2. In use, the wire has a speed of approximately 500 m / min and higher.

Virapartiet 1 innefattar dessutom en roterande guskvals 8, mot vilken guskvals 8 den lopande viran 2 ligger an pa sa satt att lOpriktningen for viran 2 leds i en ny riktning efter att denna har passerat guskvalsen 8. The wire portion 1 further comprises a rotating gus roller 8, against which gus roller 8 the running wire 2 rests in such a way that the direction of the wire 2 is guided in a new direction after it has passed the gus roller 8.

Virapartiet 1 innefattar dessutom en kantsprits 9. The wire portion 1 further comprises an edge spirit 9.

Kantspritsen 9 är anordnad Over den forsta ytan 6 av pappersbanan for att avskara en bankant 19 fran den lopande pappersbanan 1. Kantspritsen 9 är anordnad pA ett forutbestamt avstand fran kanten av pappersbanan och fran den forsta ytan av pappersbanan. The edge spruce 9 is arranged over the first surface 6 of the paper web to cut a bank edge 19 from the running paper web 1. The edge spruce 9 is arranged at a predetermined distance from the edge of the paper web and from the first surface of the paper web.

En anordning är, Atminstone till en del, anordnad under den andra ytan 4 av viran 2 for att hindra den skurna kanten av pappersbanan 5 savOl som den avskurna bankanten 19 fran att lyfta uppat. A device is, at least in part, arranged below the second surface 4 of the wire 2 to prevent the cut edge of the paper web 5 savOl as the cut bank edge 19 from lifting upwards.

Anordningen innefattar ett bOrplan 10 (se fig. 3 och fig. 4), vilket barplan 10 har en langdutstrackning, foretradesvis Or utstrOckningen has barplanet vinkelrat i fornallande till lopriktningen MD for viran 2 och pappersbanan 5. Barplanet 10 innefattar en vasentligen plan bOrplansyta 11 som dr vand uppat och Atminstone delvis ligger mot den andra ytan 4 av viran 2. Barplansytan 11 begransas av en yttre, forsta ande 12, vilken ande är belagen utanfOr en ytterkant av viran, en inre, andra ande 13, som ax belagen under viran och pappersbanan pa ett forutbestamt avstand Iran ytterkanten av viran, en forsta kant 14, som är vand i lopriktningen for viran, samt en andra kant 15, som är vand mot lopriktningen MD for viran. Barplanet 10 Or anordnat innan bankanten 19 av pappersbanan avskars av kantspritsen, foljaktligen Or den forsta kanten 14 vand mot skarpunkten for kantspritsen. Den forsta kanten 14 Or 3 foretradesvis belagen pa ett avstand am ungefar 180 mm fran skarpunkten 20. Den andra anden 13 av barplanet 10 är placerad mom ett avstand om 20 mm fran skarpunkten 20 I langdriktningen av barplanet. Vinkeln mellan barplansytan 11 och den andra ytan av viran 4 är ungefar 0-5°, varvid den andra kanten 15 ligger narmast den andra ytan 4 av viran 2. Avstandet mellan den andra kanten 15 och den andra ytan 4 av viran är 1-3 mm, foretradesvis 2 mm. Langden hos barplansytan 11 mellan den forsta nden 12 och den andra anden 13 är ungefar 200-600 mm, fOretradesvis ungefar 400 mm. Bredden has barplansytan mellan den forsta kanten 14 och den andra kanten 15 är ungefar 25-75 mm, foretradesvis 50 mm. Den andra kanten 15, som är vand mot lopriktningen far viran och luftstrommen, är lampligen mindre 90°, foretradesvis 80-85°. Vid anvandning framkallar den lopande viran en luftstrom i samma riktning som lapriktningen for viran. Barplanet och barplansytan leder luftstrommen i en ny riktning pa sa satt att luftstrommen genererar ett undertryck efter att den har passerat barplanet, varvid undertrycket for den skurna kanten av pappersbanan och den avskurna bankanten 19 nedat mot den forst& ytan av viran och hindrar dem fran att lyfta uppat. Barplanet 10 innefattar dessutom ett fastelement bestaende av ett langsgaende, T-format spar 16 i langdriktningen av barplanet for fastsattning av barplanet pa ett installningsorgan 17. Sparet Or anordnat pa undersidan av barplanet och Or vant bort fran barplansytan. The device comprises a drilling plane 10 (see Fig. 3 and Fig. 4), which bare plane 10 has a longitudinal extension, preferably the extension has the bare plane perpendicular to the running direction MD for the wire 2 and the paper web 5. The bare plane 10 comprises a substantially flat drilling surface 11 which water at the top and at least partially abuts the second surface 4 of the wire 2. The bare surface 11 is bounded by an outer, first spirit 12, which spirit is coated outside an outer edge of the wire, an inner, second spirit 13, which is coated below the wire and the paper web at a predetermined distance Iran the outer edge of the wire, a first edge 14, which is water in the running direction of the wire, and a second edge 15, which is water in the running direction MD of the wire. The bare plane 10 Or arranged before the bank edge 19 of the paper web is cut off by the edge sprit, consequently Or the first edge 14 water towards the intersection of the edge sprit. The first edge 14 or 3 is preferably located at a distance of about 180 mm from the point of intersection 20. The second end 13 of the bare plane 10 is located at a distance of 20 mm from the point of intersection 20 in the longitudinal direction of the bare plane. The angle between the bare plane surface 11 and the second surface of the wire 4 is approximately 0-5 °, the second edge 15 being closest to the second surface 4 of the wire 2. The distance between the second edge 15 and the second surface 4 of the wire is 1-3 mm, preferably 2 mm. The length of the bare surface 11 between the first end 12 and the second end 13 is approximately 200-600 mm, preferably about 400 mm. The width of the bare plane surface between the first edge 14 and the second edge 15 is approximately 25-75 mm, preferably 50 mm. The other edge 15, which is water against the running direction of the wire and the air stream, is suitably less than 90 °, preferably 80-85 °. In use, the running wire induces an air flow in the same direction as the running direction of the wire. The bare plane and the bare plane surface guide the air stream in a new direction so that the air stream generates a negative pressure after it has passed the bare plane, the negative pressure of the cut edge of the paper web and the cut bank edge 19 down towards the front surface of the wire and preventing them from lifting uppat. The bar plane 10 further comprises a fastening element consisting of a longitudinal, T-shaped groove 16 in the longitudinal direction of the bar plane for attaching the bar plane to an installation member 17. The spar is arranged on the underside of the bar plane and is wound away from the bar plane surface.

Slutligen innefattar anordningen det ovannamnda installningsorganet 17 (se fig. 5) for installning av laget has barplanet 10 i forhAllande till viran 2. Installningsorganet 17 innefattar ett installningselement 18 pa vilket bOrplanet Or fastsatt via sitt spar 16. Finally, the device comprises the above-mentioned installation means 17 (see Fig. 5) for installing the layer having the bar plane 10 in relation to the wire 2. The installation means 17 comprises an installation element 18 on which the drill plane Or is fixed via its groove 16.

Installningsorganet 17 styr insta1lningselementet 18 sa att barplanet 10 kan lutas framat, lutas bakat och 4 flyttas i dess langdriktning. Barplanet kan dessutom flyttas uppat, nedat och i riktningen for viran. The installation means 17 controls the adjusting element 18 so that the bar plane 10 can be tilted forwards, tilted backwards and 4 moved in its longitudinal direction. The bar plane can also be moved up, down and in the direction of the wire.

Med hjalp av uppfinningen uppnas framfor alit fordelarna att anordningen enligt uppfinningen, som innefattar barplanet, hailer den skurna kanten av papperet saval som den avskurna bankanten nere pa viran. Barplanet fungerar dessutom som en deflektor for luftstrOmmen som kommer fran den lOpande viran. With the aid of the invention, the advantages are achieved above all that the device according to the invention, which comprises the bare plane, heals the cut edge of the paper as well as the cut bank edge down on the wire. The bar plane also acts as a deflector for the air flow coming from the running wire.

I det ovanstaende har uppfinningen beskrivits utgaende fran nagra specifika utforingsformer. Det inses dock att andra utforingsformer och varianter är mojliga mom ramen for de efterfOljande patentkraven. Det är till exempel uppenbart att olika utforingsformer av installningsorganet är mojliga for installning av laget hos barplanet. Till exempel kan barplanet vara monterat pa en robotarm eller liknande. Fackmannen inser dessutom att de angivna dimensionerna och avstanden baserar sig pa vissa driftsparametrar och darfor kan vara annorlunda med andra driftsparametrar. In the above, the invention has been described starting from some specific embodiments. It will be appreciated, however, that other embodiments and variants are possible within the scope of the appended claims. It is obvious, for example, that different embodiments of the installation means are possible for installation of the layer at the bare plane. For example, the bare plane can be mounted on a robot arm or the like. Those skilled in the art will further appreciate that the stated dimensions and distances are based on certain operating parameters and may therefore be different from other operating parameters.

Claims

1. /7474/2 Qøaßf/ME/z/T/Wfﬁ v/.s/mﬁ »íwz/A/ßﬁﬁ C L A I M S 1. A device for preventing a paper web (5), transported(2),wherein an edge section on a(2),been moving wire from lifting away from the wire(19) cut off from the paper web by a trim squirt of the paper web has(9),characterized in that the device comprises¿ (10) that faces against the wire Formatted: List Paragraph, Bulleted +Level: 1 + Aligned at: 0,63 cm +Indent at: 1,27 cm ~ an air-foil which comprises an air-foil surface'(11) (2)arranged¿ such that¿ the air-foil surface redirects (2) suppression which prevent the paper web from and is an airstream from the moving wire to create a lifting, and er an adjusting means (17) for adjusting the position of the aipfoil relativa to thyeiwire <2; .f 2. The device according to claim 1, characterized in that(17) the air-foil the adjusting means (18) to which comprising an adjusting element(10) is attached. 3. The device according to claim 2, characterized in that (17) (18), such that, the position of the air~foil (10) can be the adjusting means controls the adjusting element adjusted. gå. The device according to any of claimselaim 1:§,(2) surface (3) and a second surface (4) which faces away characterized in that the wire comprising a firstfrom the first surface (2), wherein the paper web (5) is transported on the first surface (3) and the air-foili (Femman: Engnsn (u.|<.) J | surface (11) faces against the second surface (4)u I åâf The device according to claim 23, characterized in/that the angle between the second surface (4) and the air-foil surface (11) is about 0-5°. lO f/Jßfl Wo /cwwzwvf”ÉÛ l//JÅÛE 4§. The device according to any of claims åg-ââ,characterized in that the air-foil surface is limited bya first edge (14) which is facing with the movingdirection (MD) of the wire and a second edge (15) whichis facing against the moving direction (MD) of the wire,wherein the distance between the first edge (14) and thesecond edge (15) is 200-600 mm, preferably about 400 mm. 51. The device according to claim ﬁš, characterized in that the second edge (15), which is facing the airstreamI from the wire, is less than 902; preferably 80-85°.