SE470330B - Process for making fiberboard according to the dry method - Google Patents

Process for making fiberboard according to the dry method

Info

Publication number
SE470330B
SE470330B SE9201800A SE9201800A SE470330B SE 470330 B SE470330 B SE 470330B SE 9201800 A SE9201800 A SE 9201800A SE 9201800 A SE9201800 A SE 9201800A SE 470330 B SE470330 B SE 470330B
Authority
SE
Sweden
Prior art keywords
web
glued
dried
defibration
dry method
Prior art date
Application number
SE9201800A
Other languages
Swedish (sv)
Other versions
SE9201800L (en
SE9201800D0 (en
Inventor
C Saefstroem
A Mikaelsson
Lars-Aake Lindstroem
T Olofsson
Original Assignee
Sunds Defibrator Ind Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=20386472&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=SE470330(B) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Sunds Defibrator Ind Ab filed Critical Sunds Defibrator Ind Ab
Priority to SE9201800A priority Critical patent/SE470330B/en
Publication of SE9201800D0 publication Critical patent/SE9201800D0/en
Priority to KR1019940703807A priority patent/KR950701267A/en
Priority to DK93913692.5T priority patent/DK0647174T3/en
Priority to NZ253367A priority patent/NZ253367A/en
Priority to AT93913692T priority patent/ATE143625T1/en
Priority to SK1530-94A priority patent/SK153094A3/en
Priority to BR9306513A priority patent/BR9306513A/en
Priority to CZ943088A priority patent/CZ281548B6/en
Priority to HU9403101A priority patent/HU213466B/en
Priority to RU9394046252A priority patent/RU2083359C1/en
Priority to PL93306760A priority patent/PL170405B1/en
Priority to DE69305165T priority patent/DE69305165T2/en
Priority to JP6501367A priority patent/JPH07507735A/en
Priority to EP93913692A priority patent/EP0647174B1/en
Priority to AU43633/93A priority patent/AU662432B2/en
Priority to CA002136537A priority patent/CA2136537A1/en
Priority to PCT/SE1993/000388 priority patent/WO1993025358A1/en
Priority to ES93913692T priority patent/ES2095060T3/en
Priority to TW082103924A priority patent/TW223036B/zh
Priority to CN93106167A priority patent/CN1029461C/en
Priority to MYPI93000970A priority patent/MY131192A/en
Priority to IL10581193A priority patent/IL105811A/en
Priority to SI9300293A priority patent/SI9300293A/en
Priority to IDP614393A priority patent/ID841B/en
Priority to ZA934108A priority patent/ZA934108B/en
Priority to TR00460/93A priority patent/TR28107A/en
Priority to HR930967A priority patent/HRP930967A2/en
Publication of SE9201800L publication Critical patent/SE9201800L/en
Publication of SE470330B publication Critical patent/SE470330B/en
Priority to NO944779A priority patent/NO944779L/en
Priority to FI945790A priority patent/FI97032C/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B27N1/003—Pretreatment of moulding material for reducing formaldehyde gas emission
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres

Abstract

A method for the manufacture of fiberboard according to the dry method starting with lignocellulose-containing material which is disintegrated, glued, dried, formed to a web and pressed. Prior to the defibering, the material is treated with an impregnation solution containing fiber surface activating chemicals and preheated.

Description

470 530 2 tryck vid denna höga temperatur för att underlätta frilägg- ningen av fibrerna. Vid så hög temperatur kan dock materialet brytas ned och missfärgas till följd av inträdande hydrolys. En kort uppvärmningstid minskar denna olägenhet men missfärgning kan ändå inte undvikas samtidigt som energiförbrukningen ökar. 470 530 2 pressure at this high temperature to facilitate the release of the fibers. At such a high temperature, however, the material can decompose and discolour as a result of incoming hydrolysis. A short heating time reduces this inconvenience, but discoloration can still not be avoided while increasing energy consumption.

Ureaformaldehydlim som vanligen används kan blandas med fibermaterialet i transportledningen (blâsledningen) från defibreringsapparaten eller i en separat blandningsanordning.Urea formaldehyde adhesives commonly used can be mixed with the fibrous material in the conveying line (blowing line) from the defibrator or in a separate mixing device.

Mängden inblandat lim kan uppgå till 6% eller mer.The amount of glue involved can amount to 6% or more.

I samband med efterföljande torkning av fibermaterialet i rörtork med hjälp av gas vid hög temperatur avges större eller mindre mängd vattenlöslig formaldehyd från limmet. Som ovan angivits kan även den formaldehyd som följer med fiberma- terialet till slutpressningen förorsaka problem när den succes- sivt avges från den färdiga fiberboardskivan. Detta gäller särskilt vid belimning efter torkning av materialet, vilket kan göras vid framställning av fiberboard.In connection with subsequent drying of the fibrous material in a tube dryer with the aid of gas at a high temperature, a greater or lesser amount of water-soluble formaldehyde is released from the adhesive. As stated above, the formaldehyde that accompanies the fiber material for the final pressing can also cause problems when it is successively released from the finished fiberboard. This is especially true for gluing after drying the material, which can be done in the manufacture of fiberboard.

Föreliggande uppfinning innebär att ovanstående problem kan minskas samtidigt som ytterligare fördelar erhålles. Upp- finningen innebär att fibermaterialet behandlas med en impreg- neringsvätska innehållande fiberytaktiverande kemikalier samt förvärms före defibreringen.The present invention means that the above problems can be reduced while obtaining additional benefits. The invention means that the fibrous material is treated with an impregnating liquid containing fibrous surface activating chemicals and preheated before defibration.

Uppfinningens närmare kännetecken framgår av patentkra- ven.The more detailed features of the invention appear from the patent claims.

Exempel på sådana kemikalier är kemikalier som påverkar ligninet, såsom Na2SO3 och NaHSO3. Dessa kemikalier tillsätts i en mängd av 1-30 kg/ton material, uttryckt som Na2S03.Examples of such chemicals are chemicals that affect the lignin, such as Na2SO3 and NaHSO3. These chemicals are added in an amount of 1-30 kg / ton of material, expressed as Na 2 SO 3.

Enligt uppfinningen är det möjligt att öka ljusheten hos den färdiga produkten, att reducera energiförbrukningen vid defibreringen, att minska limtillsatsen med bibehållen håll- fasthet eller att öka hållfastheten med bibehållen limtillsats.According to the invention, it is possible to increase the brightness of the finished product, to reduce the energy consumption during defibration, to reduce the adhesive additive with retained strength or to increase the strength with retained adhesive additive.

Vidaren kan även formaldehydavspaltningen minskas väsentligt.Furthermore, formaldehyde cleavage can also be significantly reduced.

Uppfinningen skall i det följande beskrivas närmare i anslutning till några utföringsexempel.The invention will be described in more detail below in connection with some embodiments.

Fiberboard framställs genom att råmaterial i form av flis av exempelvis barrved impregneras med ligninpåverkande kemikalier, såsom Na2S03 och NaHSC5, i en mängd av 1-30, före- trädesvis 10-20 kg/ton fibermaterial, uttryckt som Na¿S03. 470 330 3 Impregneringen som skall göras snabbt kan ta någon minut.Fiberboard is produced by impregnating raw materials in the form of chips of, for example, softwood with lignin-affecting chemicals, such as Na2SO3 and NaHSC5, in an amount of 1-30, preferably 10-20 kg / ton of fibrous material, expressed as Na3SO3. 470 330 3 The impregnation to be done quickly may take a few minutes.

Därefter höjs temperaturen till 150-200°C, företrädesvis 16o-1so°c, i 2-3 min varvid pH-värdet hålls inom 2-12. Detta innebär att en impregneringslösning med Na2S03 och NaHSO3 kommer att innehålla sulfit i form av HSO3 och/eller SQf'. pH-värdet kan lämpligen regleras med NaOH.Denna kemikaliebehandling (sulfonering) medför att den efterföljande defibreringen kan utföras med lägre energiinsats än normalt till önskad defibre- ringsgrad. Energiförbrukningen ligger i intervallet 50-400 kWh/ton fibermaterial. Energibesparingen kan uppgå till ca 10% jämfört med konventionell defibrering.Thereafter, the temperature is raised to 150-200 ° C, preferably 160 DEG-200 DEG C., for 2-3 minutes, keeping the pH within 2-12. This means that an impregnation solution with Na 2 SO 3 and NaHSO 3 will contain sulphite in the form of HSO3 and / or SQf '. The pH value can suitably be regulated with NaOH. This chemical treatment (sulphonation) means that the subsequent defibration can be carried out with a lower energy input than normal to the desired degree of defibration. Energy consumption is in the range of 50-400 kWh / ton of fiber material. The energy savings can amount to about 10% compared to conventional defibration.

Impregneringen innebär vidare att ljusheten hos den färdiga fiberboardskivan ökar.The impregnation also means that the brightness of the finished fiberboard becomes increased.

Beträffande fiberfördelningen i det defibrerade materi- alet har det kunnat konstateras att såväl fínmaterialhalten som spethalten minskat, dvs andelen prima fibrer har ökat.Regarding the fiber distribution in the defibrated material, it has been found that both the fine material content and the tip content have decreased, ie the proportion of prime fibers has increased.

Vid impregnering enligt uppfinningen har det även visat sig att styrkeegenskaperna hos den färdiga skivan förbättrats väsentligt. Således har minst 10% ökning av såväl brotthâll- fasthet som elasticitetsmodul och fiberbindning kunnat konsta- teras. Alternativt kan denna effekt utnyttjas så att limtill- satsen minskas med bibehållna styrkeegenskaper. 10% ökning av fiberbindningen motsvarar 1% minskning av limtillsatsen. Sulfo- neringen enligt uppfinningen innebär dessutom att avspaltning av formaldehyd kan reduceras till följd av att sulfitjonerna i impregneringslösningen reagerar med formaldehyden så att den binds i fibermaterialet i stället för att avges från den färdi- ga skivan.In impregnation according to the invention, it has also been found that the strength properties of the finished board are significantly improved. Thus, at least a 10% increase in both fracture toughness and modulus of elasticity and fiber bonding has been observed. Alternatively, this effect can be utilized so that the adhesive additive is reduced while retaining strength properties. 10% increase in fiber bonding corresponds to a 1% decrease in the adhesive additive. The sulfonation according to the invention also means that cleavage of formaldehyde can be reduced as a result of the sulphite ions in the impregnation solution reacting with the formaldehyde so that it binds in the fibrous material instead of being released from the finished board.

Exempel Råmaterial i form av flis från rödbok utsattes för olika impregneringsbehandling. En sats behandlades med 10 kg Na2S03 per ton flis och en sats med 10 kg NaHSO3 per ton flis.Example Raw materials in the form of wood chips from red beech were subjected to various impregnation treatments. One batch was treated with 10 kg Na 2 SO 3 per tonne of chips and one batch with 10 kg NaHSO 3 per tonne of chips.

En referenssats impregnerades inte.A reference set was not impregnated.

De olika satserna förvärmdes till ca 170°C varefter de defibrerades. I blâsledningen efter defibreringen tillsattes ureaformaldehydlim av typ E2 i en mängd av 10% torrt lim räknat på torr fiber. Därefter torkades materialet till en torrhalt av ca 90%. Fibrerna torrformades till en matta som förpressades 4-70 550 4 med ett tryck av ca 1,5 MPa samt varmpressades under 5-6 min vid l70°C.The various batches were preheated to about 170 ° C after which they were defibrated. In the bladder line after defibration, urea formaldehyde glue of type E2 was added in an amount of 10% dry glue based on dry fiber. The material was then dried to a dry content of about 90%. The fibers were dry formed into a mat which was prepressed at a pressure of about 1.5 MPa and hot pressed for 5-6 minutes at 170 ° C.

De så framställda skivorna testades med avseende på hållfasthet, ljushet och formaldehydinnehâll (perforatorvärde).The disks thus prepared were tested for strength, brightness and formaldehyde content (perforator value).

Vidare noterades även den relativa energiförbrukningen för de olika satserna. Följande resultat noterades: Egenskap Referenssats flgzggs-sats NaHS03sats Böjhållfasthet MPa 38.4 43.8 40.0 Tvärdraghållfasthet MPa 1.8 2.1 2.0 Ljushet % 24 26 26 Formaldehydinnehåll mg cH2o/1oo g 27 zo 18 Relativ energiförbrukn 1.0 0.95 0.95 Resultatet bekräftar de tekniska effekter som påtalats ovan.Furthermore, the relative energy consumption for the different batches was also noted. The following results were noted: Property Reference kit fl gzggs kit NaHS03 kit Flexural strength MPa 38.4 43.8 40.0 Transverse tensile strength MPa 1.8 2.1 2.0 Brightness% 24 26 26 Formaldehyde content mg cH2o / 100 g 27 zo 18 Relative energy consumption 1.0 0.95 0.95

Uppfinningen är givetvis inte begränsad till de redovi- sade utföringsexemplen utan kan varieras inom ramen för uppfinningstanken.The invention is of course not limited to the reported embodiments but can be varied within the scope of the inventive idea.

Claims (5)

5 470 350 Patentkrav5,470,350 Patent claims 1. Förfarande för framställning av fiberboard enligt torra metoden med utgångspunkt från lignocellulosahaltigt material som defibreras, belimmas, torkas, formas till en bana och pres- sas, k ä n n e t e c k n a t av att materialet före defibre- ringen behandlas med en impregneringslösning innehållande fiberytaktiverande kemikalier i en mängd av 1-30 ton/kg fiber- material, uttryckt som Na¿S03, och förvärmes till 150-200°C varvid pH-värdet hålls inom 2-12 samt att defibreringen utföres med en energiinsats av 50-400 kWh/ton fibermaterial.Process for the production of fiberboard according to the dry method based on lignocellulosic material which is defibrated, glued, dried, formed into a web and pressed, characterized in that the material is treated before the defibration with an impregnation solution containing fiber surface activating chemicals in a amount of 1-30 tons / kg fibrous material, expressed as Na 3 SO 3, and preheated to 150-200 ° C, keeping the pH value within 2-12 and that the defibration is carried out with an energy input of 50-400 kWh / ton of fibrous material . 2. Förfarande enligt kravet 1, k ä n n e t'e c k n a t_ av att de fiberytaktiverande kemikalierna är av en typ som på- verkar ligninet.A method according to claim 1, characterized in that the fiber surface activating chemicals are of a type which affects the lignin. 3. Förfarande enligt kravet 2, k ä n n e t e c k n a t av att impregneringslösningen innehåller Na2SO3 och/eller NaHso3 . 'Process according to Claim 2, characterized in that the impregnation solution contains Na 2 SO 3 and / or NaH 50. ' 4. Förfarande enligt något av kraven 1-3, k ä n n e - t e c k n a t av att det defibrerade materialet först belimmas och därefter torkas innan det formas till en bana.4. A method according to any one of claims 1-3, characterized in that the defibrated material is first glued and then dried before it is formed into a web. 5. Förfarande enligt något av kraven 1-3, k ä n n e - t e c k n a t av att det defibrerade materialet först torkas och därefter belimmas innan det formas till en bana.5. A method according to any one of claims 1-3, characterized in that the defibrated material is first dried and then glued before it is formed into a web.
SE9201800A 1992-06-11 1992-06-11 Process for making fiberboard according to the dry method SE470330B (en)

Priority Applications (29)

Application Number Priority Date Filing Date Title
SE9201800A SE470330B (en) 1992-06-11 1992-06-11 Process for making fiberboard according to the dry method
ES93913692T ES2095060T3 (en) 1992-06-11 1993-05-04 MANUFACTURE OF A BOARD.
PL93306760A PL170405B1 (en) 1992-06-11 1993-05-04 Fibreboard making method
EP93913692A EP0647174B1 (en) 1992-06-11 1993-05-04 Manufacture of board
PCT/SE1993/000388 WO1993025358A1 (en) 1992-06-11 1993-05-04 Manufacture of board
NZ253367A NZ253367A (en) 1992-06-11 1993-05-04 Fibreboard manufacture: pretreatment
AT93913692T ATE143625T1 (en) 1992-06-11 1993-05-04 PRODUCTION OF FIBERBOARD
SK1530-94A SK153094A3 (en) 1992-06-11 1993-05-04 Method of manufacture of fibrous boards
BR9306513A BR9306513A (en) 1992-06-11 1993-05-04 Process for the manufacture of plastic fiber in sheets
CZ943088A CZ281548B6 (en) 1992-06-11 1993-05-04 Process for producing fibreboards
HU9403101A HU213466B (en) 1992-06-11 1993-05-04 A method for manufacture of fiberboard
RU9394046252A RU2083359C1 (en) 1992-06-11 1993-05-04 Method of manufacturing fiber board
DK93913692.5T DK0647174T3 (en) 1992-06-11 1993-05-04 Manufacture of plates
DE69305165T DE69305165T2 (en) 1992-06-11 1993-05-04 MANUFACTURE OF FIBERBOARDS
JP6501367A JPH07507735A (en) 1992-06-11 1993-05-04 paperboard manufacturing
KR1019940703807A KR950701267A (en) 1992-06-11 1993-05-04 Cardboard manufacturing method
AU43633/93A AU662432B2 (en) 1992-06-11 1993-05-04 Manufacture of fibre board
CA002136537A CA2136537A1 (en) 1992-06-11 1993-05-04 Manufacture of board
TW082103924A TW223036B (en) 1992-06-11 1993-05-17
CN93106167A CN1029461C (en) 1992-06-11 1993-05-20 Manutacture of board
MYPI93000970A MY131192A (en) 1992-06-11 1993-05-21 Manufacture of board
IL10581193A IL105811A (en) 1992-06-11 1993-05-25 Manufacture of board
SI9300293A SI9300293A (en) 1992-06-11 1993-06-02 Manufacture of board of lignocellulose-containing material
IDP614393A ID841B (en) 1992-06-11 1993-06-08 BOARD MAKING
ZA934108A ZA934108B (en) 1992-06-11 1993-06-10 Manufacture of board
TR00460/93A TR28107A (en) 1992-06-11 1993-06-11 Method for the manufacture of sheets made of lignocellulose-containing material.
HR930967A HRP930967A2 (en) 1992-06-11 1993-06-11 Manufacture of boards
NO944779A NO944779L (en) 1992-06-11 1994-12-09 Manufacture of plate
FI945790A FI97032C (en) 1992-06-11 1994-12-09 Manufacture of fibreboard

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9201800A SE470330B (en) 1992-06-11 1992-06-11 Process for making fiberboard according to the dry method

Publications (3)

Publication Number Publication Date
SE9201800D0 SE9201800D0 (en) 1992-06-11
SE9201800L SE9201800L (en) 1993-12-12
SE470330B true SE470330B (en) 1994-01-24

Family

ID=20386472

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9201800A SE470330B (en) 1992-06-11 1992-06-11 Process for making fiberboard according to the dry method

Country Status (29)

Country Link
EP (1) EP0647174B1 (en)
JP (1) JPH07507735A (en)
KR (1) KR950701267A (en)
CN (1) CN1029461C (en)
AT (1) ATE143625T1 (en)
AU (1) AU662432B2 (en)
BR (1) BR9306513A (en)
CA (1) CA2136537A1 (en)
CZ (1) CZ281548B6 (en)
DE (1) DE69305165T2 (en)
DK (1) DK0647174T3 (en)
ES (1) ES2095060T3 (en)
FI (1) FI97032C (en)
HR (1) HRP930967A2 (en)
HU (1) HU213466B (en)
ID (1) ID841B (en)
IL (1) IL105811A (en)
MY (1) MY131192A (en)
NO (1) NO944779L (en)
NZ (1) NZ253367A (en)
PL (1) PL170405B1 (en)
RU (1) RU2083359C1 (en)
SE (1) SE470330B (en)
SI (1) SI9300293A (en)
SK (1) SK153094A3 (en)
TR (1) TR28107A (en)
TW (1) TW223036B (en)
WO (1) WO1993025358A1 (en)
ZA (1) ZA934108B (en)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TR22594A (en) * 1987-04-07 1987-12-15 Nur Emaye San Ve Tic Tic A S STOVE PIPE EXTENSION APPARATUS
DE4327774A1 (en) * 1993-08-18 1995-02-23 Fraunhofer Ges Forschung Process for the production of medium density fibreboard (MDF)
PL184356B1 (en) 1996-04-12 2002-10-31 Marlit Ltd Method of obtaining composite lignocellulose materials
GB9625068D0 (en) * 1996-12-02 1997-01-22 Marlit Ltd Method for production of lignocellulosic composite materials
DE69629038T2 (en) 1996-12-09 2004-04-22 Plato International Technology B.V. Process for the production of cellulose fiber aggregates
WO1999002318A1 (en) * 1997-07-11 1999-01-21 Marlit Ltd. Manufacture of composite boards
DE502005010889D1 (en) * 2004-10-15 2011-03-03 Fraunhofer Ges Forschung METHOD FOR REDUCING THE DISTRIBUTION OF VOLATILE REDUCTION PRODUCTS AND WOOD MATERIALS MANUFACTURED THEREFROM, IN PARTICULAR WOODEN CHIPPLATES
PL1907178T3 (en) * 2005-07-27 2017-01-31 Kronoplus Technical Ag Method for production of wood material articles with low emissions of chemical compounds
SE0601816L (en) * 2006-09-04 2008-02-26 Metso Panelboard Ab Manufacture of wood fiber board containing on-site generated formaldehyde
DE102007054123B4 (en) 2006-11-15 2012-03-15 Edmone Roffael Process for the production of fiberboard with reduced formaldehyde emission, high moisture resistance and hydrolysis resistance of the gluing
DE102007038041A1 (en) † 2007-08-10 2009-02-12 Kronotec Ag Method for preventing the emission of aldehydes and volatile organic compounds from wood-based materials
DE102008023007A1 (en) 2007-11-11 2010-06-02 Roffael, Edmone, Prof. Dr.-Ing. Method for producing moisture-resistant and hydrolysis-resistant medium density fiberboard from e.g. derived timber product, involves using chemicals for pulping, where chemicals partially or completely replace resin in gluing phase
DE102007055415C5 (en) * 2007-11-19 2018-11-29 SWISS KRONO Tec AG Method for reducing the emission of saturated and unsaturated aldehydes from wood-based materials
DE102008050428A1 (en) 2008-10-08 2010-06-10 Roffael, Edmone, Prof. Dr.-Ing. Medium-density fiberboard manufacturing method, involves performing disintegration of fiber plates in presence of accelerator provided for alkaline hardening phenol formaldehyde resin and as potassium carbonate and/or sodium carbonate
CN101786286B (en) * 2010-04-20 2012-04-25 东北林业大学 Manufacturing method for modified enzymolysis lignin composite board
CN104690804B (en) * 2015-02-14 2017-07-18 广西丰林木业集团股份有限公司 A kind of manufacture method of electro-magnetic screen function fiberboard
EP3059056A1 (en) * 2015-02-23 2016-08-24 Basf Se Method for producing wood fibres and wood fibre boards
CN109986676A (en) * 2019-04-06 2019-07-09 安徽凯彦达环保餐具有限公司 A kind of production technology for the disposable lunch-box that can be degraded in a natural environment

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD205382A1 (en) * 1981-12-23 1983-12-28 Heinz Pecina METHOD FOR ACTIVATING WOODEN PARTICLES FOR WOOD PRODUCTION OF MATERIALS
DD242193A1 (en) * 1985-11-06 1987-01-21 Univ Dresden Tech METHOD FOR PRODUCING WOOD MATERIALS
SE466060C (en) * 1990-02-13 1995-07-11 Moelnlycke Ab Absorbent chemitermomechanical mass and preparation thereof
SU1721149A1 (en) * 1990-06-25 1992-03-23 Центральный научно-исследовательский институт бумаги Method of producing thermochemically-treated pulp
SU1724763A1 (en) * 1990-07-10 1992-04-07 Центральный научно-исследовательский институт бумаги Method of producing bleached wood pulp

Also Published As

Publication number Publication date
EP0647174A1 (en) 1995-04-12
JPH07507735A (en) 1995-08-31
HU213466B (en) 1997-06-30
NO944779D0 (en) 1994-12-09
SE9201800L (en) 1993-12-12
FI97032B (en) 1996-06-28
EP0647174B1 (en) 1996-10-02
FI945790A0 (en) 1994-12-09
ZA934108B (en) 1994-01-13
SI9300293A (en) 1994-03-31
FI945790A (en) 1994-12-09
ID841B (en) 1996-07-30
HUT69072A (en) 1995-08-28
SE9201800D0 (en) 1992-06-11
DE69305165T2 (en) 1997-03-06
BR9306513A (en) 1998-09-15
NO944779L (en) 1994-12-09
SK153094A3 (en) 1995-05-10
HU9403101D0 (en) 1995-01-30
RU94046252A (en) 1996-10-27
CN1079687A (en) 1993-12-22
TR28107A (en) 1996-01-08
IL105811A (en) 1995-12-31
KR950701267A (en) 1995-03-23
CZ281548B6 (en) 1996-11-13
IL105811A0 (en) 1993-09-22
CZ308894A3 (en) 1995-06-14
NZ253367A (en) 1995-11-27
DE69305165D1 (en) 1996-11-07
AU4363393A (en) 1994-01-04
FI97032C (en) 1996-10-10
MY131192A (en) 2007-07-31
AU662432B2 (en) 1995-08-31
PL170405B1 (en) 1996-12-31
CN1029461C (en) 1995-08-09
HRP930967A2 (en) 1995-04-30
RU2083359C1 (en) 1997-07-10
WO1993025358A1 (en) 1993-12-23
CA2136537A1 (en) 1993-12-23
ES2095060T3 (en) 1997-02-01
ATE143625T1 (en) 1996-10-15
TW223036B (en) 1994-05-01
DK0647174T3 (en) 1997-01-13

Similar Documents

Publication Publication Date Title
SE470330B (en) Process for making fiberboard according to the dry method
SE466060C (en) Absorbent chemitermomechanical mass and preparation thereof
JPS61275489A (en) Production of bleached chemimechanical and semichemical fiber pulp by two-stage impregnation method
US5482666A (en) Manufacture of fiberboard by independently controlling temperature and moisture content
SE451202B (en) PROCEDURE FOR PREPARING CHEMICAL MECHANICAL Mass
JP3258019B2 (en) Method for producing mechanical pulp and chemical mechanical pulp
FI71779B (en) FRAMEWORK FOR MECHANICAL REFINING
US3591451A (en) Pretreatment of vegetable matter and delignification of the refined matter with chloring dioxide
EP0199481A1 (en) A process for the manufacture of cellulose pulps
SE502663C2 (en) Process for making slices of lignocellulosic material
RU2080429C1 (en) Wet method for manufacturing cardboard
GB1595719A (en) Method of applying one or more layers of surface stock to the web of base pulp in fibreboard manufacture by the wet-lay system
FI127062B (en) Method and apparatus for making pulp
FI57978B (en) FOERFARANDE FOER FRAMSTAELLNING AV SLIPMASSA OCH FOER FOERBAETTRING AV DESS EGENSKAPER
NO118472B (en)
EP0892107A1 (en) Preparation of mechanical wood pulps with reduced energy
CA1045263A (en) Thermosetting adhesive compositions extended with cellulosic paper mill sludges (aminoplasts)

Legal Events

Date Code Title Description
NAL Patent in force

Ref document number: 9201800-1

Format of ref document f/p: F

NUG Patent has lapsed

Ref document number: 9201800-1

Format of ref document f/p: F