SK153094A3 - Method of manufacture of fibrous boards - Google Patents
Method of manufacture of fibrous boards Download PDFInfo
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- SK153094A3 SK153094A3 SK1530-94A SK153094A SK153094A3 SK 153094 A3 SK153094 A3 SK 153094A3 SK 153094 A SK153094 A SK 153094A SK 153094 A3 SK153094 A3 SK 153094A3
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- dried
- web
- disintegrated
- fiber
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- 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
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
- Paper (AREA)
- Laminated Bodies (AREA)
- Multicomponent Fibers (AREA)
- Artificial Filaments (AREA)
- Moulding By Coating Moulds (AREA)
- Reinforced Plastic Materials (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Harvester Elements (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
Description
Spôsob výroby vláknitých dosákMethod for producing fiber boards
Oblasť technikyTechnical field
Vynález sa týka sp&sobu výroby dosák z materiálu, obsahujúceho lignocelulózu, ako sú vláknitá dosky.The invention relates to a process for the manufacture of boards from lignocellulose-containing material, such as fiber boards.
Doterajší stav technikyBACKGROUND OF THE INVENTION
Dosky tohto typu sa vyrábajú dezintegráciou materiálu no častice, obsahujúce zväzky vláken a vlákna. K dezintegrovanému materiálu sa pridá lepidlo, materiál sa vysuší, vytvorí so rúno a to sa nakoniec lisuje za zvýšenej teploty, aby došlo k vytvrdeniu lepidla zo súčasného vzniku dosky. Vláknité dosky sa vyrátajú s materiálu, ktorý sa dezintegruje rozvlókňovaním na viac-menej voľné vlákna.Boards of this type are produced by disintegrating the material but the particles containing fiber bundles and fibers. Adhesive is added to the disintegrated material, the material is dried, formed with a web, and this is finally pressed at elevated temperature to cure the adhesive from the present sheet formation. The fiber plates are calculated from a material that disintegrates by pulping into more or less loose fibers.
Ako spojivo so používa močovino-formaldehydové lepidlo, ktoré sa pridáva k dezintegrovanému materiálu. Množstvo lepidlo môže byť 6 % alebo vyššie. Lepidlo jo pomerne nákladné, a preto je žiodúce jeho obsah znížiť na čo najmenšiu hodnotu. Pri znížení množstvo lepidla sa však zhoršuje pevnosť zhotovenej dosky. Z tohoto hľadiska je potrebné prídavok lepidlo optimalizovať. —The binder used is a urea-formaldehyde adhesive which is added to the disintegrated material. The amount of adhesive may be 6% or more. The glue is relatively expensive, and therefore it is vital to reduce its content to as low a value as possible. However, when the amount of adhesive is reduced, the strength of the manufactured board deteriorates. In this respect, the addition of the adhesive must be optimized. -
Pri sušení lepeného materiálu sa z lepidla uvoľňuje väčšie alebo menšie množstvo vo vode rozpustného formaldehydu.When drying the material to be bonded, more or less water-soluble formaldehyde is released from the adhesive.
Po oddelení sušiaceho plynu od vláknitého materiálu, napríklad v cyklóne, sa kvapalina, nachádzajúca sa v plyne vykondenzuje. Pri obvyklých .čistiacich postupoch spôsobuje vo vode rozpustný formaldehyd ťažkosti. Tiež formaldehyd, postupujúci s materiálom do finálneho lisovacieho stupňa môže spôsobovať ťažkosti, ked so následne uvoľňuje z dohotovenej dosky. Ked sa lepidlo k materiálu pridá po jeho vysušení, vzniká problém s oddeľovaním formaldehydu, ako pri lisovaní, tak aj pri dohotovených doskách.After the drying gas has been separated from the fibrous material, for example in a cyclone, the liquid present in the gas is condensed. In conventional purification procedures, water-soluble formaldehyde causes difficulties. Also, formaldehyde advancing the material to the final compression stage can cause difficulties when subsequently released from the finished board. When the glue is added to the material after it has been dried, there is a problem with formaldehyde separation, both in the molding and in the finished boards.
Vláknité dosky, vyrábaná tzv. suchým postupom, sa obvyk lc označujú skratkou MDF /Médium Density Fiberboard - vláknitá doska so strednou hustotou/ o jedná sa o vláknitý produkt, vyrobený z drevných vláken. Výtažok je vyšší než 95 %· Ako východiskový materiál sa prednostne používajú drevené štiepky, ktoré so rozvláknujú pri pomerne nízkom prívode energie 100 až 500 kWh/t vláken na volné vlákna. Eozvláknený vláknitý materiál so lepí, suší, spracováva na rúno a lisuje v horúcom lise. Alternatívne sa materiál môže sušiť pred lepením. Obvykle sa materiál predhrieva pred rozvlákňovaním na teplotu vyššiu nnž 150°C a vlastné rozvlákňovanie, pri ktorom dochádza k uvolnovaniu vláken, so uskutočňuje za tlaku pri tejto vysokej teplote. Pri takej vysokej teplote sa však materiál môže degradovoE a môže so zhoršovať jeho farba, v dôsledku prebiehajúcej hydrolýzy. Skrátením času zohrievania sa síce tento nedostatok zníži, nedá sa však vyhnúť zhoršeniu farby a zároveň pri tom stúpa spotreba energie.Fiber boards, manufactured by so-called. dry process, usually lc is abbreviated MDF / Medium Density Fiberboard / a fiber product made from wood fibers. Extraction is greater than 95% · Wood chips are preferably used as starting material, which are pulped at a relatively low energy input of 100 to 500 kWh / t of loose fiber. The fibrillated fibrous material is stuck, dried, processed into a web, and pressed in a hot press. Alternatively, the material may be dried prior to bonding. Typically, the material is preheated to a temperature of greater than 150 ° C prior to pulping, and the actual pulping, in which the fibers are released, is carried out under pressure at this high temperature. However, at such a high temperature, the material may degrade and its color may deteriorate due to the ongoing hydrolysis. By reducing the heating time, this deficiency is reduced, but deterioration of the color cannot be avoided and energy consumption increases.
MoČovino-formnldehydové leoidlo, ktoré sa obvykle použi va, sa môže miešať s vláknitým materiálom na dopravnej linke, vychádzajúcej z rozvlákňovacieho stroja alebo v separátnom miešači. Množstvo pridávaného lepidla môže byť 6 % alebo vyššie.The urea-formaldehyde lotion, which is commonly used, can be mixed with the fibrous material on a conveyor line starting from a fiberizing machine or in a separate mixer. The amount of adhesive to be added may be 6% or more.
Ke<! sa potom vláknitý materiál suší v rúrkovej sušiarni plynom s vysokou teplotou, uvoíňuje sa z lepidla vfičäie alebo menšie množstvo vo vode rozpustného formaldehydu. Ako už bolo uvedené vyššie, tiež formaldehyd, postupujúci s vláknitým materiálom do finálneho lisovacieho stupňa, môže spôsobovať problémy, keč sa následne uvolňuje z dohotovených dosák. Tento nedostatok sa prejavuje najmä v tom prípade, keč sa lepenie uskutočňuje po vysušení materiálu, ktorá so môže vykonávat pri výrobe vláknitých dosák.To <! the fibrous material is then dried in a tubular dryer with a high temperature gas, more or less of the water-soluble formaldehyde is released from the adhesive. As mentioned above, also the formaldehyde, advancing with the fibrous material to the final pressing stage, can cause problems when it is subsequently released from the finished boards. This drawback is particularly evident when the gluing is carried out after drying of the material which can be carried out in the manufacture of fiber boards.
Vyššie uvedené problémy je možné zníži E pomocou tohto vynálezu, ktorý so taktiež prejavuje prídavnými výhodami.The above problems can be reduced by E with the present invention, which also exhibits additional advantages.
Podstata vynálezuSUMMARY OF THE INVENTION
Pri spôsobe podlo vynálezu sa vláknitý materiál spracováva napúšíacou kvapalinou, obsahujúcou chemikálie, aktivujúce povrch vláken a predbežne zohrieva pred následnou dezintegráciou.In the method of the invention, the fibrous material is treated with an impregnating liquid containing chemicals that activate the surface of the fibers and preheated prior to subsequent disintegration.
Ako príklady chemikálií, vhodných na tento účel, je možné uviest chemikálie, napádajúce lignín, ako je siričitan sodný a hydrogensiričitan sodný. Tieto chemikálie sa môžu pridávaE v množstve v rozmedzí od 1 do 30 kg na tonu materiálu, vzhíadom na siričitan sodný. Spôsobom podía vynálezu je možné zvýši í svetlosE ISO zhotoveného výrobku, znížiE spotreba energie pri rozvlákňovaní, znížiE množstvo lepidla pri zachovaní pevnosti alebo zvýšiE pevnosE pri zachovaní množstva lepidla. Okrem toho sa môže podstatne znížiE oddeiovanie formaldehydu.Examples of suitable chemicals include lignin attacking chemicals such as sodium sulfite and sodium bisulfite. These chemicals may be added in an amount ranging from 1 to 30 kg per tonne of material relative to sodium sulfite. By the method according to the invention, it is possible to increase the ISO lightness of the manufactured product, to reduce the energy consumption during pulping, to reduce the amount of adhesive while maintaining strength or to increase the strength while maintaining the amount of adhesive. In addition, the separation of formaldehyde can be substantially reduced.
Vynález je podrobnejšie popísaný dolej, pričom je uvedených niekoľko uskutočnení tohto vynálezu.The invention is described in more detail below, with several embodiments of the invention being disclosed.
Vláknitá doska sa vyrobí nasledujúcim spôsobom:The fiber board is made as follows:
Surovina vo forme štiepok, napríklad z mäkkého dreva, sa napustí chemikáliami, napádajúcimi lignín, ako je napríklad siričitan sodný alebo hydrogensiričitan sodný v množstve 1 □ž 30, prednostne 10 až 20 kg/tona vláknitého materiálu, pričom toto množstvo je prepočítané na obsah siričitanu sodného, Ka2S0^.The raw material in the form of chips, for example of softwood, is impregnated with lignin-attacking chemicals such as sodium sulfite or sodium bisulfite in an amount of 1 pred 30, preferably 10 to 20 kg / ton of fibrous material, calculated on the sulfite content sodium, K 2 SO 4.
Napúšťanie, ktoré sa musí uskutočňovať rýchlo, môže trvať niekolko minút. Potom sa teplota zvýši no 150 až 200°C, prednostne 160 až 180°C na čas 2 až 3 minút. Predhrievanie sa však samozrejme môže vykonávať pred napúšťaním alebo súčasne s ním. Hodnota pH sa udržiava v rozmedzí od 2 do 12.The impregnation, which must be carried out quickly, may take several minutes. Thereafter, the temperature is raised to 150 to 200 ° C, preferably 160 to 180 ° C for 2 to 3 minutes. However, preheating may, of course, be performed prior to or simultaneously with the impregnation. The pH is maintained between 2 and 12.
Z toho vyplýva, že nopúšťací roztok, obsahujúci siričitan sodný a hydrogensiričitan sodný, bude obsehovať siričitanové ióny vo forme iónov HSO^ a/alebo SOj“. Hodnotu pH je možné účelne regulovať prídavkom hydroxidu sodného. VÓaka tomuto chemickému spracovaniu /sulfonácii/ sa nasledujúce rozvlákňovanie, ktorého cielom je dosiahnuť požadovaný stupeň rozvláknenia, môže vykonávať s nižším prívodom energie, ako je obvyklé. Spotreba energie na 1 tonu vláknitého materiálu leží v rozmedzí od 50 do 400 kWh. V porovnaní s obvyklým rozvlákňovaním sa môže dosiahnúť úspora energie až osi 10 %.Accordingly, the nonsolvent solution containing sodium sulfite and sodium bisulfite will contain sulfite ions in the form of HSO2 and / or SO2 ions. The pH can be conveniently controlled by the addition of sodium hydroxide. Due to this chemical treatment (sulphonation), the subsequent pulping, in order to achieve the desired pulping degree, can be carried out with a lower energy input than usual. The energy consumption per tonne of fiber material ranges from 50 to 400 kWh. Energy savings of up to 10% can be achieved compared to conventional pulping.
VÓaka napúšťaniu sa tiež zvýši svetlosť zhotovených vláknitých dosák.Due to the impregnation, the lightness of the fiber boards produced is also increased.
Pokial sa týka vlastností rozvlákneného materiálu, zistilo sa, že ako obsah jemných častíc, tak aj obsah zhlukov sa zníži, t.j. zvýši sa obsah akostných vláken.As regards the properties of the fiber material, it has been found that both the fine particle content and the agglomerate content are reduced, i. the content of quality fibers is increased.
Tiež sa zistilo, že sa za použitia napúšťania_podla toh to vynálezu podstatne zlepšia pevnostné vlastnosti zhotovenej dosky, fc’edza pevnosti v ťahu, modul pružnosti a pevnosť väzby vláken sa zvýši prinajmenšom o 10%. Alternatívne je možné tento účinok využiť na zníženie množstva lepidla pri zachovaní pevnostných vlastností. 1Cx-né zvýšenie pevnosti väzby vláken zodpovedá 135-nému zníženiu prídavku lepidla, vňaka sulfonačnému postupu podľa tohto vynálezu sa tiež môže znížiť oddeľovanie formaldehydu, pretože siričitanové ióny v napúšťacom roztoku reagujú s formaldehydom, takže je formaldehyd viazaný vo vláknitom materiáli a neuvoľňuje sa z dohotovenej dosky.It has also been found that using the impregnation according to the present invention, the strength properties of the manufactured board are substantially improved, as well as the tensile strength, the modulus of elasticity and the bond strength of the fibers are increased by at least 10%. Alternatively, this effect can be used to reduce the amount of adhesive while maintaining strength properties. The 1X increase in fiber bond strength corresponds to a 135-fold reduction in glue addition, and the sulfonation process of the present invention can also reduce formaldehyde separation, since sulfite ions in the impregnation react with formaldehyde so that formaldehyde is bound in the fibrous material and is not released from the finished material. board.
- y -- y -
uukutočnenia. Tento príklad má výhradne ilustratívny charakter a rozsah vynálezu v žiadnom ohlade neobmedzuje.uukutočnenia. This example is illustrative only and does not limit the scope of the invention in any way.
Príklad uskutočnenia vynálezuDETAILED DESCRIPTION OF THE INVENTION
Surovina vo forme štiepok sa spracováva rôznymi napúšíacími postupmi. Jedna dávka sa spracuje siričitanom sodným v množstve 1C kg no tonu štiepok a druhá dávka so spracuje hydrogensiričitanom sodným taktiež v množstve 10 kg na tonu štiepok. Porovnávacia dávka sa nenapúšťa.The raw material in the form of chips is processed by various impregnation processes. One batch is treated with 10% sodium sulfite per tonne of chips and the other batch is treated with 10% sodium bisulfite per tonne of chips. The comparative dose is not administered.
Napustený materiál /alebo kontrolný nenapustený/ sa predhreje približne na 170°C a potom rozvlákni. No dopravnej linke vychádzajúci z rozvlákňovacieho stroja sa k materiálu pridá močovino-formaldehydové lepidlo typu E2 v množstve 10 % sušiny lepidla, vzhľadom na sušinu vlákna. Materiál sa potom vysuší na obsah sušiny približne 90 %. Vlákna sa za sucha spracujú na rohož, ktorá sa predbežne lisuje za použitia tlaku asi 1,5 MPa a potom sa lisuje zo horúca 5 až 6 minút pri 170°C. Takto zhotovená doska sa skúša na pevnosť, svetlosť ISO a obsah formaldehydu /perforátorová hodnota/. Tiež so meria relatívna spotreba energie pri rôznych dávkach. Dosiahnu sa tieto výsledky: _The impregnated material (or control impregnated) is preheated to approximately 170 ° C and then spun. However, urea-formaldehyde adhesive type E2 in the amount of 10% of the dry matter of the adhesive, based on the dry matter of the fiber, is added to the material from the fiberising machine. The material is then dried to a dry matter content of approximately 90%. The fibers are dry-treated to a mat which is pre-compressed at a pressure of about 1.5 MPa and then hot pressed at 170 ° C for 5-6 minutes. The board thus prepared is tested for strength, ISO clearance and formaldehyde content (perforator value). The relative energy consumption at different doses is also measured. The results are: _
Vlastnosť Porovnávacia Dávka s Dávka s dávkaProperty Comparison Batch with Batch with Batch
Na2S03 Nah'SO3 pevnosť v ohybe /MPa/ pevnosť väzby vláken /MPa/ svetlosť ISO /%>/ obsah formaldehydu /mg CH2O/1C0 g/Na 2 S0 3 Nah'SO 3 flexural strength / MPa / fiber bond strength / MPa / ISO clearance /%> / formaldehyde content / mg CH 2 O / 1C0 g /
33,433.4
1,81.8
43,843.8
2,1 relatívna spotreba energie2.1 relative energy consumption
1,01.0
2C2C
0,950.95
40,040.0
2,02.0
0,950.95
- 6 Vyššie uvedené výsledky potvrdzujú, že so spôsobom pod la vynálezu dosiahnu tvrdená účinky. Vynález sa neobmedzuje no vyššie popísané konkrétne uskuotčnenia, ale je možné ho rôznym spôsobom modifikoval, pričom pre jeho rozsah sú smerodatné predovšetkým nasledujúce patentové nároky.The above results confirm that with the method according to the invention they achieve the claimed effects. The invention is not limited to the specific embodiments described above, but may be modified in various ways, and the following claims are particularly critical for its scope.
Claims (5)
Applications Claiming Priority (2)
| 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 |
| PCT/SE1993/000388 WO1993025358A1 (en) | 1992-06-11 | 1993-05-04 | Manufacture of board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SK153094A3 true SK153094A3 (en) | 1995-05-10 |
Family
ID=20386472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SK1530-94A SK153094A3 (en) | 1992-06-11 | 1993-05-04 | Method of manufacture of fibrous boards |
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) | NO944779D0 (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) |
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| 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 |
| ATE244626T1 (en) | 1996-12-09 | 2003-07-15 | Plato Internat Technology B V | METHOD FOR PRODUCING CELLULOSE FIBER ASSEMBLY |
| JP2001512058A (en) * | 1997-07-11 | 2001-08-21 | マーリット リミテッド | Production of composite boards |
| EP1799412B1 (en) * | 2004-10-15 | 2011-01-19 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Method for reducing the release of volatile organic compounds (voc) from wood and wood chip products and wood materials derived therefrom in particular particle boards |
| LT1907178T (en) * | 2005-07-27 | 2016-11-10 | Kronoplus Technical Ag | Method for production of wood material articles with low emissions of chemical compounds |
| SE530084C2 (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 |
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| 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 | 1995-09-11 | 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 |
-
1992
- 1992-06-11 SE SE9201800A patent/SE470330B/en not_active IP Right Cessation
-
1993
- 1993-05-04 CA CA002136537A patent/CA2136537A1/en not_active Abandoned
- 1993-05-04 DE DE69305165T patent/DE69305165T2/en not_active Revoked
- 1993-05-04 JP JP6501367A patent/JPH07507735A/en active Pending
- 1993-05-04 HU HU9403101A patent/HU213466B/en not_active IP Right Cessation
- 1993-05-04 DK DK93913692.5T patent/DK0647174T3/en active
- 1993-05-04 BR BR9306513A patent/BR9306513A/en not_active Application Discontinuation
- 1993-05-04 WO PCT/SE1993/000388 patent/WO1993025358A1/en not_active Application Discontinuation
- 1993-05-04 ES ES93913692T patent/ES2095060T3/en not_active Expired - Lifetime
- 1993-05-04 EP EP93913692A patent/EP0647174B1/en not_active Revoked
- 1993-05-04 AU AU43633/93A patent/AU662432B2/en not_active Ceased
- 1993-05-04 PL PL93306760A patent/PL170405B1/en unknown
- 1993-05-04 RU RU9394046252A patent/RU2083359C1/en active
- 1993-05-04 AT AT93913692T patent/ATE143625T1/en not_active IP Right Cessation
- 1993-05-04 SK SK1530-94A patent/SK153094A3/en unknown
- 1993-05-04 CZ CZ943088A patent/CZ281548B6/en unknown
- 1993-05-04 KR KR1019940703807A patent/KR950701267A/en not_active Application Discontinuation
- 1993-05-04 NZ NZ253367A patent/NZ253367A/en unknown
- 1993-05-17 TW TW082103924A patent/TW223036B/zh active
- 1993-05-20 CN CN93106167A patent/CN1029461C/en not_active Expired - Fee Related
- 1993-05-21 MY MYPI93000970A patent/MY131192A/en unknown
- 1993-05-25 IL IL10581193A patent/IL105811A/en not_active IP Right Cessation
- 1993-06-02 SI SI9300293A patent/SI9300293A/en unknown
- 1993-06-08 ID IDP614393A patent/ID841B/en unknown
- 1993-06-10 ZA ZA934108A patent/ZA934108B/en unknown
- 1993-06-11 TR TR00460/93A patent/TR28107A/en unknown
- 1993-06-11 HR HR930967A patent/HRP930967A2/en not_active Application Discontinuation
-
1994
- 1994-12-09 NO NO944779A patent/NO944779D0/en unknown
- 1994-12-09 FI FI945790A patent/FI97032C/en not_active IP Right Cessation
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