FI94653B

FI94653B - Lignocellulosic material product and method of making it

Info

Publication number: FI94653B
Application number: FI935104A
Authority: FI
Inventors: Ilkka Kartovaara
Original assignee: Enso Gutzeit Oy
Priority date: 1993-11-17
Filing date: 1993-11-17
Publication date: 1995-06-30
Also published as: FI94653C; DE69407931T2; FI935104A0; JPH07189166A; NO944352L; EP0653516A1; EP0653516B1; ES2113078T3; NO304238B1; DE69407931D1; NO944352D0; ATE162246T1

Abstract

The invention concerns a ligno-cellulosic-material-based product and a manufacturing method thereof, in which method the product is formed from multiple plies of cellulosic fibers into a multi-ply product comprising a liner ply and at least one center ply interleaved between the liner plies. The invention is characterized by having said at least one center ply of the multi-ply product enriched with thick-walled summerwood fibers, and further having the liner ply of the multi-ply product advantageously enriched with thin-walled and/or band-shaped springwood fibers.

Description

9465394653

LIGNOSELLULOOSAMATERIAALINEN TUOTE SEKÄ MENETELMÄ SEN VALMISTAMISEKSI - PRODUKT AV LIGNOCELLULOSAMATERIAL SAMT FÖRFA-RANDE FÖR DESS TILLVERKNINGLIGNOCELLULOSE MATERIAL PRODUCT AND METHOD FOR ITS MANUFACTURE - PRODUKT AV LIGNOCELLULOSAMATERIAL SAMT FÖRFA-RANDE FÖR DESS TILLVERKNING

5 Tämän keksinnön kohteena on patenttivaatimuksen 1 johdanto-osan mukainen menetelmä ja tuoterakenne lignoselluloosamate-riaalisen tuotteen valmistamiseksi.The present invention relates to a method and a product structure according to the preamble of claim 1 for the production of a lignocellulosic material product.

Monikerrostuotteet, kuten monikerrospaperi, -kartonki tai 10 -pahvi koostuvat useammasta kuin kahdesta kerroksesta. Moniker roskart onki koostuu tyypillisesti kolmesta erilaisesta kerroksesta niin, että pintakerroksilla voi olla sama koostumus. Vastaavasti kartongin keskikerros on tyypillisesti yhdestä tai useammasta yhteenhuopautetusta samankoosteisesta 15 kerroksesta muodostuva osa. Monikerroskartonki on tunnetusti palkkirakenne, jossa maksimaalinen jäykkyys saavutetaan rakenteella, jossa keskikerroksen materiaali on mahdollisimman bulkkista ja pintakerroksen massalla on mahdollisimman korkea kimmokerroin. Parhaiten tätä konseptia voidaan hyö-20 dyntää käyttämällä pinta- ja keskikerroksiin täysin erilaisia massoja. Suurin mahdollinen bulkki saavutetaan käyttämällä keskikerroksessa mekaanista tai kemimekaanista massaa (perinteinen taivekartonki).Multilayer products, such as multi-ply paper, board, or 10-board, consist of more than two layers. A moniker garbage rod typically consists of three different layers so that the surface layers can have the same composition. Accordingly, the middle layer of paperboard is typically a portion of one or more co-felted layers of the same composition. Multilayer board is known to be a beam structure in which maximum rigidity is achieved with a structure in which the material of the middle layer is as bulky as possible and the mass of the surface layer has the highest possible modulus of elasticity. This concept can best be utilized by using completely different masses for the surface and middle layers. The maximum possible bulk is achieved by using mechanical or chemimechanical pulp in the middle layer (traditional folding boxboard).

25 Mekaaniset massat eivät kuitenkaan ole vaaleuden ja lujuuden suhteen yhtä hyviä kuin kemialliset massat. Tämän johdosta käytetään elintarvikkeiden pakkaamiseen ja graafisiin tarkoituksiin pääasiassa sellukartonkeja, joissa myös keskikerros valmistetaan kemiallisesta massasta. Jolloin elintar-30 vikkeiden pakkaamiseen ja graafisiin tarkoituksiin käytettävät sellukartongit ovat pitkälle jalostettuja ja paljon eri-koisosaamista vaativia tuotealueita.25 However, mechanical pulps are not as good as chemical pulps in terms of brightness and strength. As a result, pulpboards are mainly used for food packaging and graphic purposes, where the middle layer is also made of chemical pulp. In this case, pulpboards used for food packaging and graphic purposes are highly processed product areas that require a lot of special expertise.

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Mekaanisten massojen valmistukseen käytetään lähes pelkäs-35 tään havupuuta. Massanvalmistusprosesseissa, etenkin hionnassa, pitkät havupuukuidut katkoutuvat ja lyhenevät niin, että niistä valmistettavan keskikerroksen formaatio on 2 94653 riittävä. Kemiallisen massan valmistuksessa pitkät havupuukuidut eivät katkeile jolloin syntyvän massan formaatio-ominaisuudet ovat erittäin huonot. Formaation takia sellu-kartongin keskikerroksessa käytetään lehtipuusellua vaikka 5 sen bulkkisuus (erityisesti koivumassalla) on yleensä huono ja siten keskikerroksessa edullisen palkkirakenteen periaatteiden vastainen.Almost 35 softwoods are used to make mechanical pulps. In pulping processes, especially grinding, the long softwood fibers are broken and shortened so that the formation of the middle layer made of them is 2 94653 sufficient. In the production of chemical pulp, the long softwood fibers are not broken, so that the formation properties of the resulting pulp are very poor. Due to the formation, hardwood pulp is used in the middle layer of the pulp board, although its bulk (especially with birch pulp) is generally poor and thus contrary to the principles of the preferred beam structure in the middle layer.

Havupuumassa, edullisesti mäntysellu sisältää monikerroskar-10 tongin kuten kolmikerroskartongin pinta- ja keskikerroksen kannalta edullisia kuituja. Havupuumassa ei ole kuitutasolla homogeenista raaka-ainetta vaan se koostuu kahdesta hyvin erilaisesta kuitutyypistä: paksuseinämäiset kesäpuukuidut ja ohutseinämäiset kevätpuukuidut. Havupuumassan kesäpuukuidut 15 ovat kuitupituutta lukuunottamatta ideaalista raaka-ainetta sellukartongin keskikerrokseen. Niistä valmistetun arkin bulkki on n. 40 % parempi kuin koivumassan. Havupuumassan kevätpuukuidut ovat kuitupituutta lukuunottamatta erittäin sopivaa raaka-ainetta kartongin pintakerrokseen, etenkin jos 20 kartonki päällystetään. Nauhamaiset kuidut muodostavat hyvin suljetun pinnan, eivät lisää karheutta (koivuun verrattuna) kuten normaali havupuumassa ja ne parantavat myös pinnan kimmokerrointa maksimaalisen jäykkyyden saavuttamiseksi.The softwood pulp, preferably pine pulp, contains fibers which are advantageous for the surface and middle layer of multilayer board, such as three-ply board. Coniferous wood does not have a homogeneous raw material at the fiber level but consists of two very different fiber types: thick-walled summer wood fibers and thin-walled spring wood fibers. The softwood pulp summer wood fibers 15, with the exception of the fiber length, are an ideal raw material for the middle layer of pulpboard. The bulk of the sheet made from them is about 40% better than the birch pulp. With the exception of fiber length, softwood pulp spring wood fibers are a very suitable raw material for the surface layer of paperboard, especially if 20 paperboards are coated. The strip-like fibers form a well-sealed surface, do not increase roughness (compared to birch) as in normal softwood pulp, and they also improve the surface elastic modulus for maximum rigidity.

.·25 Keksinnön mukaisesti on nyt havaittu, että monikerrostuot-teen pinta- ja keskikerrosten vaatimat erilaiset ominaisuudet voidaan täyttää hyödyntämällä havupuun vuosikasvaimen sisältämien hyvin erilaisten kuitujen ominaisuuksia optimaalisella tavalla. Vaikka nykyisin tunnetuilla teollisilla 30 prosesseilla ei saadakkaan aivan täysin puhtaita jakeita, voidaan fraktioinnilla rikastettujen jakeiden ominaisuuksien persteella osoittaa, että esim. kolmikerroksisen sellukartongin jäykkyyttä voitaisiin parantaa n. 30 % nykyiseen tekniikkaan verrattuna. Havupuumassan kuidut voidaan jauha-35 maila katkoa niin tehokkaasti, että keksinnön mukaisessa monikerrostuotteessa voidaan käyttää hyvin suuria havupuu-According to the invention, it has now been found that the various properties required by the surface and middle layers of the multilayer product can be met by making optimal use of the properties of the very different fibers contained in the annual coniferous tumor. Although the currently known industrial processes do not give completely pure fractions, it can be shown by the properties of the fractionation-enriched fractions that, for example, the stiffness of three-ply pulpboard could be improved by about 30% compared to the current technology. The fibers of the softwood pulp can be cut with 35 mills so efficiently that very large softwood pulps can be used in the multilayer product according to the invention.

IIII

3 94653 osuuksia ominaisuuksien siitä kärsimättä. Keksinnön yhtenä tavoitteena on kehittää fraktiointitekniikkaa, jonka avulla voidaan olennaisesti parantaa havupuusellun ominaisuuksia monikerrostuotteen kuten kolmikerroksisen sellukartongin 5 raaka-aineena.3 94653 shares of properties without suffering. It is an object of the invention to provide a fractionation technique which makes it possible to substantially improve the properties of softwood pulp as a raw material for a multilayer product such as three-ply pulpboard 5.

Keksinnön mukaisen monikerrostuotteen valmistuksessa pyritään mahdollisimman hyvään kesä-/kevätpuukuitujen erotukseen. Pintakerrosta varten fraktioidaan massaa,johon rikas-10 tetaan mahdollisimman puhtaana kevätkuidut. Keksinnön mukai selle menetelmälle ja tuoterakenteelle tunnusomaiset piirteet on esitetty patenttivaatimuksissa.In the manufacture of the multilayer product according to the invention, the aim is to achieve the best possible separation of summer / spring wood fibers. For the surface layer, the pulp is fractionated, in which the spring fibers are enriched as pure as possible. Characteristic features of the method and product structure according to the invention are set out in the claims.

Olennaista keksinnössä on, että monikerrostuotteen yhtä tai 15 useampaa keskikerrosta on rikastettu paksuseinämäisellä kesäpuukuidulla, lisäksi on edullista, että monikerrostuotteen pintakerrosta on rikastettu ohutseinämäisellä ja/tai nauhamaisella kevätpuukuidulla. Erityisen edullinen sovellutus keksinnön mukaiselle menetelmälle ja tuoterakenteelle 20 on, että monikerrostuotteen, sopivimmin monikerroskartongin pintakerros koostuu havu- tai havu- ja lehtipuuselluloosan seoksesta, johon havupuuselluloosan fraktioon on rikastettu ohutseinämäistä kevätpuukuitua sekä, että monikerroskartongin yksi tai useampi keskikerros on havu- tai havu- ja .25 lehtipuuselluloosan seosta, johon kevätpuukuitujen erottami sessa syntyneeseen havupuuselluloosan rejektifraktioon on rikastunut paksuseinämäistä kesäpuukuitua.It is essential in the invention that one or more middle layers of the multilayer product are enriched with a thick-walled summer wood fiber, it is further preferred that the surface layer of the multilayer product is enriched with a thin-walled and / or strip-like spring wood fiber. A particularly advantageous application of the method and product structure 20 according to the invention is that the surface layer of a multilayer product, preferably multilayer board, consists of a mixture of softwood or softwood and hardwood pulp. Enriched with softwood pulp or single layer plywood or monolayer. 25 a mixture of hardwood pulp, in which thick-walled summer wood fiber has been enriched in the reject fraction of softwood pulp formed by the separation of spring wood fibers.

Alan ammattimiehelle on selvää, että keksinnön erilaiset 30 sovellutusmuodot eivät rajoitu edellä esitettyyn vaan voivat vaihdella oheisten patenttivaatimusten puitteissa.It will be clear to a person skilled in the art that the various embodiments of the invention are not limited to the above but may vary within the scope of the appended claims.

Claims

A method of manufacturing a product of lignocellulosic material, in which a process is made for the product of several cellulosic fiber-containing layers into a multilayer product comprising a surface layer and between the surface layers one or more intermediate layers, characterized in that one or more of the The middle layer of the clay product is enriched with summer trees with a thick wall. 10

Method according to claim 1, characterized in that the surface layer of the multi-layer product is enriched with a fiber, with a thin wall and / or which is band-shaped, of a host tree. 15

Method according to claim 1 or 2, characterized in that a fraction of the summer / host tree fibers Mr of conifers, most preferably of pine cellulose pulp.

Method according to any of the preceding claims, characterized in that the multilayer product is a multilayer carton, cardboard or paper.

Process according to any one of the preceding claims, characterized in that the multilayer product, advantageously the multilayer cardboard surface layer 2, is made from a fraction of softwood cellulose enriched with thin-walled host fibers and that one or more of the multilayer cardboard middle layer is manufactured as a rejects arises in the separation of host tree fibers and tili which have been enriched with thick-walled summer tree fibers 30.

Method according to any of the preceding claims, characterized in that the surface layer of the multilayer product, advantageously the multilayer carton is made of a mixture of coniferous and deciduous cellulose, wherein a fraction of the coniferous cellulose is enriched with a laminate layer of thin-walled fiber and one or more of a 94653 blend of coniferous and deciduous cellulose, where a thick wall of summer tree fiber with enriched fraction of coniferous cellulose which arises during the separation of host tree fibers has been enriched. 5

Product of lignocellulosic material formed from multiple cellulosic fiber-containing layers into a multi-layer product comprising a surface layer and between the surface layers one or more intermediate layers, characterized in that one or more of the intermediate layers of the multi-layer product are enriched with thick-walled summer tree fibers.

Multilayer product according to claim 7, characterized in that the surface layer of the multilayer product is enriched with fibers, having a thin wall and / or being band-shaped, of a host tree.

Multilayer product according to claims 7-8, characterized in that the multilayer product is a multilayer carton, cardboard or paper. 20

The multi-layer product according to claims 7-9, characterized in that the surface layer of the multi-layer product, advantageously the multi-layer carton is made from a fraction of softwood cellulose enriched with thin-walled host fibers, and that one or more of the middle layer of the multi-layer carton is produced as a reject. occurs during the separation of host tree fibers and tili which has been enriched summer tree fibers with thick wall.

Multilayer product according to claims 7-10, characterized in that the surface layer of the multilayer product, advantageously the multilayer carton comprises a mixture of softwood and deciduous cellulose, wherein a fraction of the coniferous cellulose is enriched with thin-walled host fiber of the multilayer one layer of multilayer blend of coniferous and deciduous cellulose, in which a rejected fraction of coniferous cellulose which arises during the separation of host tree fibers has been enriched with thick-walled summer tree fibers.