NO884590L - PROCEDURE FOR THE MANUFACTURE OF WOODEN PAPER. - Google Patents
PROCEDURE FOR THE MANUFACTURE OF WOODEN PAPER.Info
- Publication number
- NO884590L NO884590L NO88884590A NO884590A NO884590L NO 884590 L NO884590 L NO 884590L NO 88884590 A NO88884590 A NO 88884590A NO 884590 A NO884590 A NO 884590A NO 884590 L NO884590 L NO 884590L
- Authority
- NO
- Norway
- Prior art keywords
- layer
- paper
- layers
- forming
- middle layer
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 12
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000000835 fiber Substances 0.000 claims description 15
- 239000000945 filler Substances 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 38
- 239000000123 paper Substances 0.000 description 18
- 238000005452 bending Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 235000018185 Betula X alpestris Nutrition 0.000 description 1
- 235000018212 Betula X uliginosa Nutrition 0.000 description 1
- 210000000481 breast Anatomy 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011121 hardwood Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000002655 kraft paper Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000011122 softwood Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
- D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
- D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers
Landscapes
- Paper (AREA)
- Making Paper Articles (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Moulding By Coating Moulds (AREA)
Description
Denne oppfinnelse angår en fremgangsmåte for fremstilling av et symmetrisk trelagspapir, nærmere bestemt et papir fremstilt av to heterogene emner, fortrinnsvis ved at et emne danner papirets topplag og det andre emnet danner dets mellomlag. This invention relates to a method for producing a symmetrical three-layer paper, more specifically a paper produced from two heterogeneous blanks, preferably in that one blank forms the paper's top layer and the other blank forms its middle layer.
Det har lenge vært kjent å fremstille papir av flere lag, særlig ved fremstilling av kartong og kraft-dekkpapir, dvs. for produkter som har en flatevekt høyere enn 100 g/m<2>. I de fleste tilfeller utføres dette på en slik måte at lagene dannes særskilt og ved et tilstrekkelig tørrstoffinnhold presses mot hverandre for å frembringe en flerlagsstruktur, såkalt særskilt forming. Fordelene ved denne fremstillingsmetode er It has long been known to produce paper of several layers, particularly in the production of cardboard and kraft cover paper, i.e. for products that have a basis weight higher than 100 g/m<2>. In most cases, this is carried out in such a way that the layers are formed separately and, with a sufficient dry matter content, are pressed against each other to produce a multi-layered structure, so-called separate forming. The advantages of this manufacturing method are
god styring av fiberfordelingen i de forskjellige lag gode muligheter for å hindre blanding av fibre i de good management of the fiber distribution in the different layers good possibilities to prevent mixing of fibers in them
forskjellige lagdifferent teams
gode muligheter til å variere flatevektområdet ved an-tallet av lag og flatevekt/lag. good opportunities to vary the basis weight range by the number of layers and basis weight/layer.
Ulempene erThe disadvantages are
vanskeligheten med å opprettholde den indre bindstyrke the difficulty in maintaining the internal bond strength
ved flere enn to lagat more than two teams
høyere kapitalomkostninger.higher capital costs.
En annen fremgangsmåte for fremstilling av flerlagspapir er den såkalte samforming. Denne finner sted i lagdelte innløpskas-ser, hvilket innebærer at forskjellige oppslåtte masser ledes samtidig ut gjennom særskilte (separate) dyser og danner en felles stråle ut fra innløpskassen. Derved kan det imidlertid forekomme en betydelig blanding av fibrene mellom lagene, og der er ingen mulighet for fraskilling av bakvannet. Denne metode gir ikke så store fordeler som den særskilte forming med hensyn til fiberkontroll og flatevekt-variasjon, men kapitalkostnadene er lavere, og minskingen i indre bindstyrke ved flere enn to lag er mindre stor. Det er således tidligere kjent å bruke flerlags-innløpskasser der alle lag formes samtidig. Another method for producing multilayer paper is the so-called co-forming. This takes place in layered inlet boxes, which means that different broken-up masses are led out simultaneously through separate (separate) nozzles and form a common jet from the inlet box. Thereby, however, a significant mixing of the fibers can occur between the layers, and there is no possibility of separation of the backwater. This method does not offer as great advantages as the special forming with regard to fiber control and basis weight variation, but the capital costs are lower, and the reduction in internal bond strength with more than two layers is less great. It is thus previously known to use multi-layer inlet boxes where all layers are formed at the same time.
En fremgangsmåte for fremstilling av flerlagspapir er beskrevet i WO 85/05387. A method for producing multilayer paper is described in WO 85/05387.
Figuren i nevnte skrift viser et arrangement for fremstilling av et trelagspapir, omfattende en indre vire 1 og en ytre vire 4. Fra en innløpskasse 9 strømmer masse ut på viren 1 og avvannes, hvoretter massen fra en annen kasse 10 strømmer ut på banen, og ytterligere avvanning finner sted ved hjelp av en valse 2, og de to lag føres mellom den indre og ytre vire. Det andre overflatelag dannes av massesuspensjon fra en tredje innløpskasse 14 på en vire 8 og forenes med de to andre lag ved vendevalsen 7. The figure in the aforementioned document shows an arrangement for the production of a three-layer paper, comprising an inner wire 1 and an outer wire 4. From an inlet box 9, pulp flows out onto the wire 1 and is dewatered, after which the pulp from another box 10 flows out onto the web, and further dewatering takes place by means of a roller 2, and the two layers are passed between the inner and outer wire. The second surface layer is formed by pulp suspension from a third inlet box 14 on a wire 8 and is united with the other two layers by the turning roller 7.
Ifølge oppfinnelsen blir imidlertid de to topplag og stort sett halvparten av mellomlaget dannet ved samforming fra to særskilte innløpskasser, og de to lag forenes ved særskilt forming. According to the invention, however, the two top layers and mostly half of the middle layer are formed by co-forming from two separate inlet boxes, and the two layers are united by separate forming.
Fremgangsmåten ifølge oppfinnelsen er særlig egnet for bruk ved fremstilling av finpapir av høy kvalitet, særlig egnet for kopiering ved xerografi. The method according to the invention is particularly suitable for use in the production of fine paper of high quality, particularly suitable for copying by xerography.
Ifølge oppfinnelsen er det bare nødvendig med to særskilt formete lag for å frembringe en trelagskonstruksjon. According to the invention, only two specially shaped layers are necessary to produce a three-layer construction.
Ved fremgangsmåten ifølge oppfinnelsen presses en toppside mot en toppside, hvilket gir god symmetri og en bedre indre bindstyrke enn ved samforming hvor avvanning skjer i begge retninger. In the method according to the invention, a top side is pressed against a top side, which gives good symmetry and a better internal bond strength than with co-forming where dewatering occurs in both directions.
Oppfinnelsen gjør det også mulig å tillate høye hydro-dynamiske strømninger, ettersom antall lag i en kasse er begrenset til to, og awanningsstrekningen kan justeres til awannings-behovet. Det blir derved mulig å bruke lave konsentrasjoner i mellomlaget, og en stor andel av korte fibre, eventuelt med høy malingsgrad, i det ytre lag med sikte på å oppta en god over-flate. Den lave konsentrasjon gjør det mulig å forme et papir med godt utseende og lange fibre (nåletre). Oppfinnelsen gjør det følgelig mulig å kombinere flerlagsteknikk med økende mulighet til å bruke lange fibre. For tiden anvendes minst 50% løvved i finpapir. Ved bruk av ovennevnte teknikk skal det være mulig fritt å velge bestanddelene av lange fibre og korte fibre i mellomlaget og derved vesentlig minske avhengigheten av ved ved fremstilling av et fullt tilfredsstillende finpapir. Ved å anvende en særskilt formingsteknikk, kan bøyestivheten komme nær det teoretiske nivå for en lagstruktur. Dette innebærer en forbedring på ca. 20% av bøyestivheten ved en fiberblanding på 50% bjerkefibre og 50% lange fibre. De sterkt malte korte fibre på overflaten gir en høy glatthet, som minsker behovet for glitting. Mellomlaget kan være tilsatt fyllmiddel for å minske faren for sedimenter og slitasje fra papiroverflaten. The invention also makes it possible to allow high hydrodynamic flows, as the number of layers in a box is limited to two, and the dewatering stretch can be adjusted to the dewatering need. It is thereby possible to use low concentrations in the middle layer, and a large proportion of short fibres, possibly with a high degree of dyeing, in the outer layer with the aim of occupying a good surface. The low concentration makes it possible to form a paper with a good appearance and long fibers (softwood). The invention therefore makes it possible to combine multilayer technology with the increasing possibility of using long fibres. Currently, at least 50% hardwood is used in fine paper. When using the above-mentioned technique, it should be possible to freely choose the components of long fibers and short fibers in the middle layer and thereby significantly reduce the dependence on wood when producing a fully satisfactory fine paper. By using a special forming technique, the bending stiffness can come close to the theoretical level for a layered structure. This implies an improvement of approx. 20% of the bending stiffness with a fiber mixture of 50% birch fibers and 50% long fibers. The strongly painted short fibers on the surface provide a high smoothness, which reduces the need for polishing. The middle layer can have filler added to reduce the risk of sediments and wear from the paper surface.
Ved å forene to identisk formete lag, slik at viresidene danner yttersider, oppnås et ark som har perfekt symmetri, som er betraktelig bedre enn det som oppnås dersom arket hadde vært formet i et enkelt trinn. Dette skyldes at strømningskreftene under avvanning søker å fordele det fine materialet på skrå i arkets tverretning. Det er mer fint materiale på overflaten enn mot viren, der strømningen har vært sterkest. Et ark som er formet i et enkelt trinn vil derfor alltid oppvise en større eller mindre forskjell i egenskapene i arkets tverretning. Den eneste måte man kan forme et fullstendig symmetrisk ark på, er derfor å forene to identisk formete lag med oversidene eller viresidene mot hverandre. Viresidene er uegnet, ettersom mangelen på fine fibre fører til en lav indre bindstyrke. Oppfinnelsen gjør bruk av disse fakta for fremstilling av et ark med høyest mulig symmetri, hvilket ark følgelig har ekstrem dimensjonsstabilitet. Ettersom dette er en nødvendighet for et papir som skal brukes i en kopieringsmaskin, innebærer dette at et papir som er fremstilt ifølge oppfinnelsen er særlig egnet for bruk som kopieringspapir. By joining two identically shaped layers, so that the wire sides form outer sides, a sheet is obtained which has perfect symmetry, which is considerably better than what would be obtained if the sheet had been formed in a single step. This is because the flow forces during dewatering seek to distribute the fine material at an angle in the transverse direction of the sheet. There is more fine material on the surface than towards the wire, where the flow has been strongest. A sheet that is formed in a single step will therefore always show a greater or lesser difference in the properties in the transverse direction of the sheet. The only way to form a completely symmetrical sheet is therefore to join two identically shaped layers with the upper sides or wire sides facing each other. Wire sides are unsuitable, as the lack of fine fibers leads to a low internal bond strength. The invention makes use of these facts to produce a sheet with the highest possible symmetry, which sheet consequently has extreme dimensional stability. As this is a necessity for a paper to be used in a copying machine, this means that a paper produced according to the invention is particularly suitable for use as copying paper.
Sammenfatningsvis gir fremgangsmåten ifølge oppfinnelsen et papir med In summary, the method according to the invention provides a paper with
- høyere bøyestivhet- higher bending stiffness
høyere symmetrihigher symmetry
fritt valg av fiberblandingerfree choice of fiber mixtures
mulighet for høy andel av fyllmiddel.possibility of a high proportion of filler.
Ifølge en spesiell utføringsform av fremgangsmåten ifølge oppfinnelsen formes mellomlaget ved lav innløpskasse-konsentrasjon, og ytterlaget formes ved en høyere konsentrasjon. According to a special embodiment of the method according to the invention, the middle layer is formed at a low inlet box concentration, and the outer layer is formed at a higher concentration.
Oppfinnelsen er i det følgende beskrevet ved hjelp av en utføringsform av denne, og med henvisning til den medfølgende tegning. The invention is described in the following with the help of an embodiment thereof, and with reference to the accompanying drawing.
EKSEMPELEXAMPLE
Figuren viser en vire 15 som løper over brystvalsene 13, 14. Fra en innløpskasse 1 med lag 2 og 3 føres den oppslåtte masse for et topplag gjennom 3 og halvparten av flatevekten for mellomlaget gjennom 2 for å danne den samformete bane 18 på viren. Avvanning finner sted ved 16. Fra innløpskassen 4, som også omfatter to lag 5 og 6, føres massen på samme måte for topplaget gjennom 5 og ca. halvparten av flatevekten for mellomlaget gjennom 6. Den resulterende bane 2 0 avvannes ved 10 gjennom viren 19. Viren med banen 2 0 løper så over valsen 9 og formes særskilt med banen 18 ved pressvalsen 12. Det ferdige trelagspapir består da av topplagene 21 og 23 og mellomlaget 22. The figure shows a wire 15 that runs over the breast rollers 13, 14. From an inlet box 1 with layers 2 and 3, the broken-up mass for a top layer is fed through 3 and half of the surface weight for the middle layer through 2 to form the co-shaped path 18 on the wire. Dewatering takes place at 16. From the inlet box 4, which also includes two layers 5 and 6, the mass is fed in the same way for the top layer through 5 and approx. half of the surface weight of the intermediate layer through 6. The resulting web 20 is dewatered at 10 through the wire 19. The wire with the web 20 then runs over the roller 9 and is formed separately with the web 18 at the press roller 12. The finished three-layer paper then consists of the top layers 21 and 23 and the middle layer 22.
Oppfinnelsen er ikke begrenset til den viste og beskrevne utføringsform, men kan varieres innenfor rammen av oppfinnelses-tanken. The invention is not limited to the embodiment shown and described, but can be varied within the framework of the inventive idea.
Claims (5)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8704040A SE459263B (en) | 1987-10-16 | 1987-10-16 | SAVED TO MAKE WOODEN PAPER PAPERS |
Publications (2)
Publication Number | Publication Date |
---|---|
NO884590D0 NO884590D0 (en) | 1988-10-14 |
NO884590L true NO884590L (en) | 1989-04-17 |
Family
ID=20369911
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NO88884590A NO884590L (en) | 1987-10-16 | 1988-10-14 | PROCEDURE FOR THE MANUFACTURE OF WOODEN PAPER. |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0312512A1 (en) |
BR (1) | BR8805033A (en) |
DE (1) | DE312512T1 (en) |
ES (1) | ES2007585A4 (en) |
FI (1) | FI884763A (en) |
NO (1) | NO884590L (en) |
PT (1) | PT88754A (en) |
SE (1) | SE459263B (en) |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5804036A (en) * | 1987-07-10 | 1998-09-08 | The Procter & Gamble Company | Paper structures having at least three regions including decorative indicia comprising low basis weight regions |
US6136146A (en) * | 1991-06-28 | 2000-10-24 | The Procter & Gamble Company | Non-through air dried paper web having different basis weights and densities |
US5820730A (en) * | 1991-06-28 | 1998-10-13 | The Procter & Gamble Company | Paper structures having at least three regions including decorative indicia comprising low basis weight regions |
US5501768A (en) * | 1992-04-17 | 1996-03-26 | Kimberly-Clark Corporation | Method of treating papermaking fibers for making tissue |
US5348620A (en) * | 1992-04-17 | 1994-09-20 | Kimberly-Clark Corporation | Method of treating papermaking fibers for making tissue |
FI94653C (en) * | 1993-11-17 | 1995-10-10 | Enso Gutzeit Oy | Product of lignocellulosic material and process for its manufacture |
MY131659A (en) * | 1993-12-08 | 2007-08-30 | Beloit Technologies Inc | Machine and method for forming multiply linerboard from two sheets |
US6203663B1 (en) | 1995-05-05 | 2001-03-20 | Kimberly-Clark Worldwide, Inc. | Decorative formation of tissue |
DE19526205C2 (en) * | 1995-07-18 | 2000-08-17 | Voith Sulzer Stoffaufbereitung | Process and plant for producing a multilayer paper or cardboard web |
FI110704B (en) * | 1996-10-18 | 2003-03-14 | Metso Paper Inc | Multilayer Headbox Mass Feeding System and Method for Multilayer Headboard Operation |
US6039839A (en) | 1998-02-03 | 2000-03-21 | The Procter & Gamble Company | Method for making paper structures having a decorative pattern |
FI114489B (en) | 1999-12-23 | 2004-10-29 | Metso Paper Inc | A method for separating water from dilute water-fiber suspensions |
DE10122047A1 (en) * | 2001-05-07 | 2002-11-14 | Voith Paper Patent Gmbh | Sheet forming device and method |
DE10223398A1 (en) * | 2002-05-25 | 2003-12-04 | Voith Paper Patent Gmbh | A forming apparatus |
WO2012041392A1 (en) * | 2010-10-01 | 2012-04-05 | Metso Paper, Inc. | Device and method for manufacturing a web consisting of multiple layers |
CN110093805A (en) * | 2018-01-30 | 2019-08-06 | 精工爱普生株式会社 | Sheet producing device and method of producing sheet |
WO2019154540A1 (en) * | 2018-02-09 | 2019-08-15 | Voith Patent Gmbh | Method and device for producing a multilayer fibrous web |
SE543829C2 (en) * | 2019-12-19 | 2021-08-03 | Stora Enso Oyj | A light weight linerboard for corrugated board |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI71377B (en) * | 1984-05-11 | 1986-09-09 | Ahlstroem Oy | FOERFARANDE FOER FRAMSTAELLNING AV FLERSKIKTSKARTONG |
-
1987
- 1987-10-16 SE SE8704040A patent/SE459263B/en not_active IP Right Cessation
-
1988
- 1988-08-31 EP EP88850286A patent/EP0312512A1/en not_active Withdrawn
- 1988-08-31 DE DE198888850286T patent/DE312512T1/en active Pending
- 1988-08-31 ES ES88850286T patent/ES2007585A4/en active Pending
- 1988-09-29 BR BR8805033A patent/BR8805033A/en unknown
- 1988-10-13 PT PT88754A patent/PT88754A/en not_active Application Discontinuation
- 1988-10-14 FI FI884763A patent/FI884763A/en not_active Application Discontinuation
- 1988-10-14 NO NO88884590A patent/NO884590L/en unknown
Also Published As
Publication number | Publication date |
---|---|
FI884763A (en) | 1989-04-17 |
DE312512T1 (en) | 1989-08-24 |
SE459263B (en) | 1989-06-19 |
PT88754A (en) | 1989-07-31 |
EP0312512A1 (en) | 1989-04-19 |
BR8805033A (en) | 1989-05-09 |
NO884590D0 (en) | 1988-10-14 |
SE8704040L (en) | 1989-04-17 |
FI884763A0 (en) | 1988-10-14 |
SE8704040D0 (en) | 1987-10-16 |
ES2007585A4 (en) | 1989-07-01 |
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