NO120396B - - Google Patents
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- Publication number
- NO120396B NO120396B NO153420A NO15342064A NO120396B NO 120396 B NO120396 B NO 120396B NO 153420 A NO153420 A NO 153420A NO 15342064 A NO15342064 A NO 15342064A NO 120396 B NO120396 B NO 120396B
- Authority
- NO
- Norway
- Prior art keywords
- temperature
- stage
- defibration
- defibrator
- grinding
- Prior art date
Links
- 239000000126 substance Substances 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000004061 bleaching Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 238000010924 continuous production Methods 0.000 claims description 2
- 210000000056 organ Anatomy 0.000 claims description 2
- 239000000243 solution Substances 0.000 description 14
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 6
- 239000003513 alkali Substances 0.000 description 4
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 4
- 238000005470 impregnation Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 230000032258 transport Effects 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 239000007844 bleaching agent Substances 0.000 description 2
- GRWZHXKQBITJKP-UHFFFAOYSA-N dithionous acid Chemical compound OS(=O)S(O)=O GRWZHXKQBITJKP-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 244000089654 Betula populifolia Species 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 240000000731 Fagus sylvatica Species 0.000 description 1
- 235000010099 Fagus sylvatica Nutrition 0.000 description 1
- 241000218657 Picea Species 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 206010061592 cardiac fibrillation Diseases 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000002600 fibrillogenic effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- PFUVRDFDKPNGAV-UHFFFAOYSA-N sodium peroxide Chemical compound [Na+].[Na+].[O-][O-] PFUVRDFDKPNGAV-UHFFFAOYSA-N 0.000 description 1
- ZBNMBCAMIKHDAA-UHFFFAOYSA-N sodium superoxide Chemical compound [Na+].O=O ZBNMBCAMIKHDAA-UHFFFAOYSA-N 0.000 description 1
- 229910000144 sodium(I) superoxide Inorganic materials 0.000 description 1
- 241000894007 species Species 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/14—Disintegrating in mills
- D21B1/16—Disintegrating in mills in the presence of chemical agents
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
- D21D1/30—Disc mills
Description
Fremgangsmåte for fremstilling av tremasse av flis i måleapparater. Procedure for the production of wood pulp from chips in measuring devices.
Oppfinnelsen vedrorer en fremgangsmåte for å fremstille masse for papirfremstilling i utbytte mellom 85 og 95 % av flis i kontinuerlig forlop ved oppvarmning. av denne under damptrykk i en forvarmer ved en temperatur mellom 140 og 220° C, og i en kort tid i nærvær av små mengder blekende kjemikalier eller svake alkalier for å unngå misfarvning av flisen, samt derpå folgende defibrering under hoyt trykk og hoy temperatur. The invention relates to a method for producing pulp for papermaking in a yield of between 85 and 95% of chips in a continuous process by heating. of this under steam pressure in a pre-heater at a temperature between 140 and 220° C, and for a short time in the presence of small amounts of bleaching chemicals or weak alkalis to avoid discolouration of the tile, as well as subsequent defibration under high pressure and high temperature.
Ulempen med defibrering respektive raffinering under trykk og hoy temperatur, 140 - 220° C, er at massen brytes ned og blir misfarvet ved inntreden av hydrolyse. En kort oppvarmningstid minsker denne ulempe, men også i det tilfellet at oppvarmningstiden velges så kort at flisen forst bringes til defibreringstem-peratur i det oyeblikk den passerer inn mellom maleskivene, blir massens farve ikke tilfredsstillende, f.eks. for fremstilling av eller innblanding i avispapir. The disadvantage of defibration or refining under pressure and high temperature, 140 - 220° C, is that the mass breaks down and becomes discolored when hydrolysis occurs. A short heating time reduces this disadvantage, but also in the case that the heating time is chosen so short that the tile is first brought to defibration temperature at the moment it passes between the grinding disks, the color of the mass is not satisfactory, e.g. for the production of or mixing in newsprint.
Fra tidligere vet man at det kan fremstilles masser med hoyt utbytte og god hvithet, 60 - 70 % G.E., om man for defibrering under damptrykk impregnerer og varmer opp flisen med sulfittopp-losninger. I de tilfeller man tilsikter anvendelse av visse lovtreslag, f.eks. bjerk og bok, er impregneringsveien den beste losning liksom i de tilfeller man onsker å oppnå hoye styrkeverdi-er på massen. It is known from the past that it is possible to produce pulp with a high yield and good whiteness, 60 - 70% G.E., if you impregnate and heat the tile with sulphite top solutions for defibration under steam pressure. In those cases where it is intended to use certain types of timber, e.g. birch and beech, the impregnation method is the best solution, as in cases where you want to achieve high strength values on the mass.
Det er også kjent å tilsette kjemikalier stort sett bestående av ammoniakk til flisen ved atmosfærisk trykk for den innmates i de-fibreringssystemet og oppvarmes. Ifolge en annen kjent metode til-settes kjemikalier i oppløsningen til under damptrykk oppvarmet flis umiddelbart for dens innmatning mellom maleorganene og defibreringen skjer under rådende trykk- og temperaturforhold. It is also known to add chemicals mostly consisting of ammonia to the chip at atmospheric pressure before it is fed into the defibration system and heated. According to another known method, chemicals are added to the solution of wood chips heated under steam pressure immediately before it is fed between the grinding members and the defibration takes place under the prevailing pressure and temperature conditions.
Gjelder sporsmålet fra barved, f.eks. gran og furu eller visse andre enn de ovenfor nevnte lovtreslag, f.eks. asp, å fremstille mekaniske masser med hoy hvithet og hoyt utbytte, mellom 85 - 95 %, har det vist seg mulig helt å unngå impregneringen og istedenfor innmate sulfittoppldsningen umiddelbart for flisens passasje inn i maleskivene. Sulfittopplosningen virker i det vesentlige som et blekemiddel og utlosningen av organisk substans blir lav. Den massetype, som berores av oppfinnelsen er nærmest å rubrisere som en masse som kan erstatte eller komplettere på konvensjonelle slipestoler fremstilt masse. Utover teknikkens tidligere stand kjennetegnes således oppfinnelsen ved at defibreringen skjer i to trinn mellom maleorgan i en defibrator, idet defibreringen i et forste trinn skjer under i forvarmere*herskende temperatur og til denne svarende trykk og i annet trinn ved relativt lavere overtrykk og en temperatur mellom 80 og 120° C og at kjemikaliene på Applies to the trace size from bare wood, e.g. spruce and pine or certain other than the above-mentioned legal tree species, e.g. asp, to produce mechanical pulps with high whiteness and high yield, between 85 - 95%, it has proved possible to completely avoid the impregnation and instead feed the sulphite solution immediately for the passage of the tiles into the grinding wheels. The sulphite solution essentially acts as a bleaching agent and the release of organic matter is low. The pulp type, which is the result of the invention, can almost be classified as a pulp that can replace or complement the pulp produced on conventional sanding chairs. Beyond the previous state of the art, the invention is characterized by the fact that the defibration takes place in two stages between grinding members in a defibrator, with the defibration in a first stage taking place under the preheater*prevailing temperature and pressure corresponding to this and in a second stage at a relatively lower overpressure and a temperature between 80 and 120° C and that the chemicals on
i og for seg kjent vis kontinuerlig tilfores materialet i forste In a manner known per se, the material is continuously supplied at first
trinn resp. begge trinn umiddelbart for flismaterialets innmatning mellom maleorganene og således ved forste trinn forst etter forvarmeren uten at derved nevneverdig tap av organisk substans forekommer. steps or both stages immediately for the feeding of the chip material between the grinding organs and thus in the first stage only after the pre-heater without any significant loss of organic substance thereby occurring.
En forutsetning for oppnåelse av god hvithet og akseptabel styrke av massen er at flisens oppvarmningstid inklusive defibreringstid gjores kort. Arbeider man i temperaturområdet 140 - 220° C, eksem-pelvis 160 - 180° C, bor oppvarmningstiden ikke overstige 5 min. og fortrinnsvis ikke 2 min. Oppvarmningstiden regnes da fra det oyeblikk da flisen har nådd den tilsiktede slutt-temperatur. Massen må derfor raskt avkjoles, så snart den har passert maleskivene, hvilket fortrinnsvis skjer ved en rask trykksenkning og derav folgende ekspansjon av damp.Kjemikaliene tilfores i opp-løsning eller suspensjon til den oppvarmede flis. A prerequisite for achieving good whiteness and acceptable strength of the mass is that the tile's heating time, including defibration time, is kept short. If you work in the temperature range 140 - 220° C, for example 160 - 180° C, the heating time should not exceed 5 minutes. and preferably not 2 min. The heating time is then calculated from the moment when the tile has reached the intended final temperature. The mass must therefore be quickly cooled, as soon as it has passed the grinding wheels, which preferably happens by a rapid reduction in pressure and consequent expansion of steam. The chemicals are added in solution or suspension to the heated tile.
På tegningen vises som eksempel et anlegg egnet for fremgangsmåtens utfdreise vist i sideoppriss og delvis i snitt. The drawing shows, as an example, a plant suitable for carrying out the method shown in side elevation and partly in section.
Flisen som skal behandles innfores gjennom en sluse eller en så-kalt cellemater 10 til en forvarmer 12. Denne tilfores damp gjennom en ledning 14, i hvilken er anbragt en ventil 16. Forvarmeren kan ha et avlop 18 forsynt med en ventil 20 for forbrukt damp resp. gasser som avgår fra flisen. Flisen daler ned i forvarmeren og oppvarmes herunder raskt til den tilsiktede behandlingstemperatur, f.eks. mellom 160 - 180° C, avhengig av dampens temperatur og trykk. Ved bunnen av forvarmeren 12 finnes der en skruemater 22, som drives via et kjedehjul 24 av en ikke vist motor og som tran-sporterer den forvarmede flis gjennom en kanal 26 til en defibrator 28, forsynt med to maleskiver 30, 32 på i og for seg kjent måte. Defibratoren kan være av den art som fremgår av norsk patent nr. 104.082.Maleskiven 32 drives av en motor 34. En kjemikalie-opplosning, fortrinnsvis sulfittopplosning, tilfores flisen umiddelbart, for den passerer mellom maleskivene 30, 32. Dette kan skje gjennom et inntak 36 anordnet i kanalen 26. The tile to be treated is introduced through a sluice or a so-called cell feeder 10 to a preheater 12. This is supplied with steam through a line 14, in which a valve 16 is placed. The preheater can have a drain 18 equipped with a valve 20 for consumed steam respectively gases that depart from the tile. The chip descends into the pre-heater and is quickly heated up to the intended treatment temperature, e.g. between 160 - 180° C, depending on the temperature and pressure of the steam. At the bottom of the preheater 12 there is a screw feeder 22, which is driven via a chain wheel 24 by a motor not shown and which transports the preheated chips through a channel 26 to a defibrator 28, provided with two grinding discs 30, 32 on i and for known way. The defibrator can be of the type that appears in Norwegian patent no. 104,082. The grinding disc 32 is driven by a motor 34. A chemical solution, preferably a sulphite solution, is supplied to the tile immediately, because it passes between the grinding discs 30, 32. This can happen through an intake 36 arranged in channel 26.
Den defibrerte masse avgår gjennom en ledning 38, i hvilken er anbragt en sluse eller drossel 40. I defibratoren 28 hersker samme trykk som i forvarmeren 12, men ved passasjen gjennom slusen 40 inntrer en plutselig trykksenkning og tilsvarende temperatursenk-ning. Ved utfbrelseseksemplet er en defibrator 42 anbragt i umidd-elbar tilslutning til defibratoren 28, hvorfor ledningen 38 munner ut i defibratorens innlop. Defibratoren har maleskiver 44, 46 og av hvilke den sistnevnte drives av en motor 48. Defibratoren kan prinsipielt være av samme art som defibratoren 28, men er anordnet for å bevirke en lengre drevet oppdeling av fibrene fra hver-andre resp. fibrillering av enkelte fibre. Temperaturen i defibratoren er over 100° c. Også her tilfores kjemikalier umiddelbart for massen går inn mellom maleskivene, f.eks. en ledning 50, som ved utforelseseksemplet munner ut radielt innenfor malespalten mellom maleskivene. Massens transportvei til disse etter impregneringen med kjemikaliene blir således meget kort. Defibratoren 42 har et avlop 52 forsynt med en sluse eller ventil 54 for massens videre transport, f.eks. ut i det fri. The defibrated mass leaves through a line 38, in which a sluice or throttle 40 is placed. The same pressure prevails in the defibrator 28 as in the preheater 12, but during the passage through the sluice 40 a sudden pressure drop and corresponding temperature drop occurs. In the embodiment, a defibrator 42 is placed in immediate connection to the defibrator 28, which is why the line 38 opens into the defibrator's inlet. The defibrator has grinding discs 44, 46 and of which the latter is driven by a motor 48. The defibrator can in principle be of the same type as the defibrator 28, but is arranged to effect a longer driven division of the fibers from each other or fibrillation of individual fibers. The temperature in the defibrator is over 100° c. Here, too, chemicals are supplied immediately before the mass enters between the grinding discs, e.g. a line 50, which in the exemplary embodiment opens out radially within the grinding gap between the grinding disks. The transport path of the mass to these after the impregnation with the chemicals is thus very short. The defibrator 42 has a drain 52 provided with a sluice or valve 54 for the further transport of the mass, e.g. out into the open.
Også i defibratoren 28 kan kjemikalieopplosningen innfores i massen på det sted som befinner seg rett innenfor maleskivene. For dette oyemed kan skruetransportorens 22 aksel 23 utfores hul og derved tjene som tilforselskanal, som munner ut fremme på maleskivene. Also in the defibrator 28, the chemical solution can be introduced into the mass at the place located directly inside the grinding disks. For this reason, the shaft 23 of the screw conveyor 22 can be made hollow and thereby serve as a supply channel, which opens out at the front of the grinding discs.
Sulfittopplosningens blekende virkning kan okes ved tilsetning av hydrosulfitt eller zinkstov. Den etterfølgende raffinering av den defibrerte masse kan skje med eller uten tilstedeværelse av hydrosulfitt, fri SO2eller fri S02og zinkstov. Ved etterbleking av den defibrerte masse med natriumperoksyd eller hydrogenperoksyd eller hypokloritt kan man ved defibreringen innmate utspedd alkaliopplosning for å motvirke hydrolysen. Massens farve blir da dår-ligere enn om sulfittopplosning blir anvendt, men den blir istedenfor lettere å etterbleke med nevnte blekekjemikalier. Anvendes hypoklorit, for blekingen, bor massesuspensjonens pH ligge omkring 9. For å unngå sterk brunfarving av massen ved defibreringen i alkalisk miljo, kan man anvende svak natriumsuperoksydopplosning eller alkaliopplosning tilsatt peroksyd. De alkaliske oppløsning-ene kan bestå av alkalihydrat og/eller alkalikarbonat. I visse tilfeller har det vist seg mulig å anvende suspensjoner av hydrat- er og karbonater av alkaliske jordmetaller, f.eks. kalcium- og magnesiumhydrat resp. -karbonat. Kjemikaliene kan tilfores måle-apparatet i blanding eller hver for seg, når de er sammensatt av flere komponenter. The bleaching effect of the sulphite solution can be increased by adding hydrosulphite or zinc dust. The subsequent refining of the defibrated pulp can take place with or without the presence of hydrosulphite, free SO2 or free SO2 and zinc dust. When post-bleaching the defibrated mass with sodium peroxide or hydrogen peroxide or hypochlorite, dilute alkali solution can be fed in during defibration to counteract the hydrolysis. The color of the pulp will then be poorer than if sulphite solution is used, but it will instead be easier to re-bleach with said bleaching chemicals. If hypochlorite is used for bleaching, the pH of the pulp suspension should be around 9. To avoid strong browning of the pulp during defibration in an alkaline environment, a weak sodium superoxide solution or alkali solution with added peroxide can be used. The alkaline solutions can consist of alkali hydrate and/or alkali carbonate. In certain cases, it has proven possible to use suspensions of hydrates and carbonates of alkaline earth metals, e.g. calcium and magnesium hydrate resp. -carbonate. The chemicals can be fed to the measuring device in a mixture or separately, when they are composed of several components.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE6080/63A SE303088B (en) | 1963-05-31 | 1963-05-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NO120396B true NO120396B (en) | 1970-10-12 |
Family
ID=20267863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO153420A NO120396B (en) | 1963-05-31 | 1964-05-27 |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US3388037A (en) |
| AT (1) | AT277746B (en) |
| BE (1) | BE648604A (en) |
| CH (1) | CH429421A (en) |
| DE (1) | DE1517170A1 (en) |
| FI (1) | FI43029C (en) |
| GB (1) | GB1069405A (en) |
| NL (1) | NL6406055A (en) |
| NO (1) | NO120396B (en) |
| SE (1) | SE303088B (en) |
Families Citing this family (49)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3467574A (en) * | 1966-06-14 | 1969-09-16 | Crown Zellerbach Corp | Refiner bleaching of high yield pulps |
| SE341322B (en) * | 1968-04-02 | 1971-12-20 | Defibrator Ab | |
| US3627629A (en) * | 1970-05-06 | 1971-12-14 | Bauer Bros Co | Refining system and process |
| SE359332B (en) * | 1971-12-20 | 1973-08-27 | Reinhall Rolf | |
| US4030969A (en) * | 1972-06-13 | 1977-06-21 | Defibrator Ab | Method of dispersing a bleaching agent into a stream of fibrous cellulosic pulp material in a throttling nozzle |
| US4037792A (en) * | 1972-10-23 | 1977-07-26 | Sca Development Aktiebolag | Continuously refining raw fibrous material to produce mechanical refiner pulp |
| SE386694B (en) * | 1973-09-06 | 1976-08-16 | Sca Development Ab | KIT FOR TREATMENT OF FIBER MATERIAL WHEN THE FIBER MATERIAL IS FIRST PREHEATED WITH ANGA IN A PRE-MAKER |
| CA1042159A (en) * | 1974-12-09 | 1978-11-14 | Domtar Inc. | High yield pulping process |
| US4087317A (en) * | 1975-08-04 | 1978-05-02 | Eucatex S.A. Industria E Comercio | High yield, low cost cellulosic pulp and hydrated gels therefrom |
| FI61215B (en) * | 1976-11-23 | 1982-02-26 | Defibrator Ab | SAFETY RANGE OF CONTAINER FRAMSTAELLA LIGNOCELLULOSAHALTIGA FIBERMATERIAL |
| US4106979A (en) * | 1977-03-21 | 1978-08-15 | Consorzio Fabocart S.P.A. | Preparation of paper pulps from dicotyledonous plants |
| FI54818C (en) * | 1977-04-19 | 1979-03-12 | Valmet Oy | FOERFARANDE FOER FOERBAETTRING AV EN THERMOMECHANICAL MASS EGENSKAPER |
| US4229250A (en) * | 1979-02-28 | 1980-10-21 | Valmet Oy | Method of improving properties of mechanical paper pulp without chemical reaction therewith |
| US4247362A (en) * | 1979-05-21 | 1981-01-27 | The Buckeye Cellulose Corporation | High yield fiber sheets |
| US4349413A (en) * | 1979-07-25 | 1982-09-14 | The Black Clawson Company | Cellulosic fiber insulation and process of preparation |
| US4699691A (en) * | 1980-11-24 | 1987-10-13 | W. R. Grace & Co. | Thermomechanical digestion process |
| US4455195A (en) * | 1982-01-05 | 1984-06-19 | James River Corporation | Fibrous filter media and process for producing same |
| US4455237A (en) * | 1982-01-05 | 1984-06-19 | James River Corporation | High bulk pulp, filter media utilizing such pulp, related processes |
| SE8501246L (en) * | 1985-03-13 | 1986-09-14 | Eka Ab | SET TO MANUFACTURE IN BLEACH, CHEMICAL MECHANICAL AND SEMI-CHEMICAL FIBER MASS USING ONE-STEP IMAGRATION |
| SE456430B (en) * | 1985-11-06 | 1988-10-03 | Sunds Defibrator | SET FOR MAKING MECHANICAL MASS |
| DE3610940A1 (en) * | 1986-03-04 | 1987-09-10 | Escher Wyss Gmbh | HIGH TEMPERATURE HIGH CONSISTENCY FAST WHITE |
| SE456826B (en) * | 1986-04-18 | 1988-11-07 | Svenska Traeforskningsinst | SET TO REDUCE ENERGY CONSUMPTION BY REFINING CELLULOSALLY MATERIAL |
| US4848678A (en) * | 1987-03-17 | 1989-07-18 | Kikkoman Corporation | Apparatus for crushing fruit and vegetables |
| GB2215350B (en) * | 1988-03-16 | 1992-05-20 | Thiokol Morton Inc | Process for bleaching mechanical wood pulp |
| US5298118A (en) * | 1988-07-12 | 1994-03-29 | Atochem | Preparation of bleached chemithermomechanical pulp |
| US5076892A (en) * | 1989-07-20 | 1991-12-31 | Sprout-Bauer Inc. | Apparatus for pressurized refining of lignocellulose material |
| US5085735A (en) * | 1989-09-05 | 1992-02-04 | Kamyr Ab | Method of refining cellulosic fibrous material with successive expansions before impacts, and expansions, to achieve increased fiber flexibility |
| US5607546A (en) * | 1990-02-13 | 1997-03-04 | Molnlycke Ab | CTMP-process |
| SE466060C (en) | 1990-02-13 | 1995-07-11 | Moelnlycke Ab | Absorbent chemitermomechanical mass and preparation thereof |
| CA2111261A1 (en) * | 1992-12-14 | 1994-06-15 | Jeffrey Nye | Elimination of sulfur dioxide formation in refiner bleaching |
| SE470555B (en) * | 1992-12-30 | 1994-08-22 | Sunds Defibrator Ind Ab | Process for the manufacture of mechanical and chemical mechanical pulp with a yield of more than 85% from lignocellulosic fibrous material |
| US5853534A (en) * | 1992-12-30 | 1998-12-29 | Sunds Defibrator Industries Ab | Method of producing pulp with high yield using a two-stage refining system operating at different temperatures |
| SE501894C2 (en) * | 1993-10-13 | 1995-06-12 | Kvaerner Pulping Tech | Method and apparatus for mixing fluid in a pulp suspension |
| US6743332B2 (en) * | 2001-05-16 | 2004-06-01 | Weyerhaeuser Company | High temperature peroxide bleaching of mechanical pulps |
| SE519462C2 (en) * | 2001-06-21 | 2003-03-04 | Holmen Ab | Process for Preparation of Bleached Thermomechanical Pulp (TMP) or Bleached Chemithermomechanical Pulp (CTMP) |
| US7018509B2 (en) * | 2002-08-31 | 2006-03-28 | International Paper Co. | Elimination of alum yellowing of aspen thermomechanical pulp through pulp washing |
| US7967948B2 (en) * | 2006-06-02 | 2011-06-28 | International Paper Company | Process for non-chlorine oxidative bleaching of mechanical pulp in the presence of optical brightening agents |
| US20100224333A1 (en) * | 2009-03-09 | 2010-09-09 | Prasad Duggirala | Method and chemical composition to improve efficiency of mechanical pulp |
| US9932709B2 (en) | 2013-03-15 | 2018-04-03 | Ecolab Usa Inc. | Processes and compositions for brightness improvement in paper production |
| US9879361B2 (en) | 2012-08-24 | 2018-01-30 | Domtar Paper Company, Llc | Surface enhanced pulp fibers, methods of making surface enhanced pulp fibers, products incorporating surface enhanced pulp fibers, and methods of making products incorporating surface enhanced pulp fibers |
| RU2656495C2 (en) | 2014-02-21 | 2018-06-05 | ДОМТАР ПЭЙПЕР КОМПАНИ ЭлЭлСи | Cellulose fibers with increased surface |
| US10710930B2 (en) | 2014-02-21 | 2020-07-14 | Domtar Paper Company, Llc | Surface enhanced pulp fibers in fiber cement |
| EP3135811B1 (en) * | 2015-08-27 | 2017-10-11 | VestaEco SA | Production method of pulp derived from biomass for producing composite boards |
| WO2018026804A1 (en) | 2016-08-01 | 2018-02-08 | Domtar Paper Company, Llc | Surface enhanced pulp fibers at a substrate surface |
| US11499269B2 (en) | 2016-10-18 | 2022-11-15 | Domtar Paper Company Llc | Method for production of filler loaded surface enhanced pulp fibers |
| CN106351049B (en) * | 2016-11-19 | 2018-06-05 | 江门市鸿祥纸业有限公司 | A kind of paper grade (stock) classification pulp crushing apparatus convenient for cleaning |
| WO2019152969A1 (en) | 2018-02-05 | 2019-08-08 | Pande Harshad | Paper products and pulps with surface enhanced pulp fibers and increased absorbency, and methods of making same |
| US11608596B2 (en) | 2019-03-26 | 2023-03-21 | Domtar Paper Company, Llc | Paper products subjected to a surface treatment comprising enzyme-treated surface enhanced pulp fibers and methods of making the same |
| CN113249996B (en) * | 2021-03-08 | 2022-08-02 | 山东诺建机械科技有限公司 | Production process for preparing fiber by breaking wall of plant raw material |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1711706A (en) * | 1924-11-03 | 1929-05-07 | Bauer Bros Co | Method of making wood pulp |
| US1870650A (en) * | 1930-09-06 | 1932-08-09 | Brown Co | Chemical modification of cellulose fiber |
| US2454532A (en) * | 1940-08-03 | 1948-11-23 | Wood Conversion Co | Process for defibering lignocellulose while subjected to steam and a digestive chemical |
| US2957795A (en) * | 1956-06-07 | 1960-10-25 | Bolton John W & Sons Inc | Process for making paper pulp |
| US2960161A (en) * | 1957-05-16 | 1960-11-15 | John C F C Richter | Device for discharging materials from vessels |
| US3023140A (en) * | 1958-11-24 | 1962-02-27 | Bauer Bros Co | Pulp bleaching |
-
1963
- 1963-05-31 SE SE6080/63A patent/SE303088B/xx unknown
-
1964
- 1964-05-27 NO NO153420A patent/NO120396B/no unknown
- 1964-05-28 US US370959A patent/US3388037A/en not_active Expired - Lifetime
- 1964-05-28 GB GB22064/64A patent/GB1069405A/en not_active Expired
- 1964-05-29 NL NL6406055A patent/NL6406055A/xx unknown
- 1964-05-29 DE DE19641517170 patent/DE1517170A1/en active Pending
- 1964-05-29 BE BE648604D patent/BE648604A/xx unknown
- 1964-05-29 FI FI641183A patent/FI43029C/en active
- 1964-05-29 CH CH701864A patent/CH429421A/en unknown
- 1964-06-01 AT AT471664A patent/AT277746B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| SE303088B (en) | 1968-08-12 |
| DE1517170A1 (en) | 1970-10-29 |
| AT277746B (en) | 1970-01-12 |
| NL6406055A (en) | 1964-12-01 |
| FI43029C (en) | 1972-01-21 |
| US3388037A (en) | 1968-06-11 |
| BE648604A (en) | 1964-09-16 |
| CH429421A (en) | 1967-01-31 |
| FI43029B (en) | 1970-09-02 |
| GB1069405A (en) | 1967-05-17 |
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