CA2445340A1 - Method for the production of woodpulp - Google Patents
Method for the production of woodpulp Download PDFInfo
- Publication number
- CA2445340A1 CA2445340A1 CA002445340A CA2445340A CA2445340A1 CA 2445340 A1 CA2445340 A1 CA 2445340A1 CA 002445340 A CA002445340 A CA 002445340A CA 2445340 A CA2445340 A CA 2445340A CA 2445340 A1 CA2445340 A1 CA 2445340A1
- Authority
- CA
- Canada
- Prior art keywords
- pulp
- fiber
- production
- loading
- bleaching
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 229920001131 Pulp (paper) Polymers 0.000 title abstract description 10
- 239000000835 fiber Substances 0.000 claims abstract description 57
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 239000011111 cardboard Substances 0.000 claims abstract description 6
- 238000009388 chemical precipitation Methods 0.000 claims abstract description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 26
- 239000000123 paper Substances 0.000 claims description 10
- 238000004061 bleaching Methods 0.000 claims description 7
- 239000000654 additive Substances 0.000 claims description 5
- 230000000996 additive effect Effects 0.000 claims description 5
- 239000007844 bleaching agent Substances 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 239000000460 chlorine Substances 0.000 claims description 2
- 229910052801 chlorine Inorganic materials 0.000 claims description 2
- 238000010411 cooking Methods 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 150000002978 peroxides Chemical class 0.000 claims description 2
- 229940088417 precipitated calcium carbonate Drugs 0.000 claims description 2
- 238000009472 formulation Methods 0.000 claims 2
- 239000000203 mixture Substances 0.000 claims 2
- 238000007670 refining Methods 0.000 claims 1
- 239000011087 paperboard Substances 0.000 abstract description 5
- 238000002360 preparation method Methods 0.000 abstract description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 12
- 239000000920 calcium hydroxide Substances 0.000 description 12
- 235000011116 calcium hydroxide Nutrition 0.000 description 12
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 11
- 239000002657 fibrous material Substances 0.000 description 11
- 239000000945 filler Substances 0.000 description 11
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 8
- 229910002092 carbon dioxide Inorganic materials 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000000292 calcium oxide Substances 0.000 description 5
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 5
- 239000011575 calcium Substances 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000002023 wood Substances 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 235000011777 Corchorus aestuans Nutrition 0.000 description 1
- 240000000491 Corchorus aestuans Species 0.000 description 1
- 235000010862 Corchorus capsularis Nutrition 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- JYYOBHFYCIDXHH-UHFFFAOYSA-N carbonic acid;hydrate Chemical compound O.OC(O)=O JYYOBHFYCIDXHH-UHFFFAOYSA-N 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 239000012510 hollow fiber Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/02—Cellulose; Modified cellulose
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/001—Modification of pulp properties
- D21C9/002—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
- D21C9/004—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives inorganic compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Abstract
The invention relates to a method for the production of woodpulp for further use in the preparation of a fibre web, in particular a paper or cardboard web, whereby the woodpulp obtained from a woodpulp production process is firstly treated with adjuncts in a chemical precipitation reaction and the treated woodpulp subsequently dried and prepared for further use or brought into a form for dispatch.
Description
METifOD FOR THE PRODU-CTYON OF FIBER P
Cross Reference to Related Anplxcations This is a continuation of prior PCT application No. PCT/,EP02/0161 l, entitled "IvIETHOD FOR THE PRODUCTION OF WOODPULP", filed February 13, 2002.
BACKGROUND OF THE INVENTION
1. li5ield of the invention, The present invention relates to a method for the production of fiber pulp for further utilization in the production of a fiber web, especially a paper or cardboard web.
Cross Reference to Related Anplxcations This is a continuation of prior PCT application No. PCT/,EP02/0161 l, entitled "IvIETHOD FOR THE PRODUCTION OF WOODPULP", filed February 13, 2002.
BACKGROUND OF THE INVENTION
1. li5ield of the invention, The present invention relates to a method for the production of fiber pulp for further utilization in the production of a fiber web, especially a paper or cardboard web.
2. Description of the related arx.
Fiber pulp is produced is pulp mills through various methods. The raw materials ate natural raw materials, such as (predominantly) wood, straw, jute, etc. Wood for example is cooked in a cooking process and the pulp fibers are leached out and are subjected to quality improvement in further process steps (i.e. bleach, washing, etc.). At the end of the process the pulp is thickened, dried and transported to the paper mills, for example in the form of bales.
There, the fiber pulps are again dissolved in Qulpe~rs and are prepared for the paper manufacturing process, for example refined and mixed with fillers. This can occur thtough direct addition of a filler, for exazuple calcium carbonate (CaC03), or through loading of the surfaces of the pulp fibers with a precipitated additive, for example, a filler such as calcium carbonate.
Loading with an additive, for example a filler, can occur through a chemical precipitation reacxi.an, especially through. a so-called "Fiber Loading'~'M" process, as described in addition to other publications, in U.S. Patent No. 5,223,090. In this type of "Fiber LoadingTM" process at least one additive, especially a filler is deposited onto the ru.oistened fiber surfaces of the fibrous material. The chemical precipitation reaction occurs preferably directly on the fiber surfaces.
voroz~s.us The fibers can for example be loaded with calcium carbonate. Calcium oxide and~ot calcium hydroxide are added to the moist, disintegrated fibrous material so that at least a part of this associates itself with the water that is contained in the fibrous material.
The so treated fibrous material is subsequently treated with carbon dioxide.
S When adding the medium containing the calcium oxide andlox the calcium hydroxide to the fiber stock suspension, a chemical reaction with exotherntal characteristics occurs. The calcium, hydroxide should preferably be added in liduid form (milk of lime).
'his implies that the wager that is possibly embedded in or added to the fibrous materials of the fiber stock suspension is riot absolutely necessary for the start and devet.~pme,a ofthe cremxcal aeavu~,u.
i0 SUMMARY OF THE ~1WENTION
~'he present invention provides a method ~or the production of fiber pulp that will increase tire efficiency of the utilized "Fiber Loadizxg''''~" process, as well as the economic efficiency of the raw material supply, especially i'or paper and cardboard production.
The present inventive method provides for the production of pulp for subsequent use in 15 the production of a fiber web, especially a paper or cardboard web. The manufachired pulp is first loaded with an additive by way of a chemical precipitation reaction. The loaded pulp is then dried at~d available for subsequent utilization or formulated into a suitable ~om1 for shipment.
The present inventive combination of the fiber pulp producctton with the loading process provides improved paper qualities. Since no drying occurs between the pulp production process 20 and the loading procESS, more calcium hydroxide or calcium oxide can penetrate through the fiber walls, thereby allowing a greater filler content at the inner cell wall suz~ace9 to be achieved after the precipitation pzocess, and increasing the desired effect through loading. Compared with fiber pulp to which ~ller (calcium carbonate) was added in the conventional method, the voxoz~s.us consistencies, optical characteristics, the specific volume (cm3/g) and the porosity, as well as the formation of the produced paper can be increased or improved.
An additional advantage of the present invention is that the fibers can be loaded. centrally, at the pulp mill. Therefore, only one single larger loading station for all the pulp mill customers combined is necessary. In contrast, if the loading process is decentralized, then ata. individual loading station is required for each customer. Overall, this loading process is less ei~cient due to cumulative longer downtimes and set-up times.
An additional advantage is found in that the pulp which is loaded with precipitated filler is easier to thicken and accordingly easier to dry. This results in pulp slabs that are produ~.Pxi ~r the pulp mill for shipment and that are generally several tithes thicket than paper (> 1000 g/ma) can be dried economically to a much higher level of dry content than previously. Since correspondingly less water needs to be ttansported, shipping costs are reduced. At the same time considerable energy savings are possible when producing the same shipping dxy content.
A further advantage is that due to the combination ofthe pulp production and the loading processes, the strength potential of the fibers, and accordingly, the strength of the paper that is subsequently produced in the paper mill, can be considerably increased or, that less fiber material is required for a given paper consistency. On the one hand this is attributed to the fact that through the combination of the loading pxocess at the time of the pulp production, considerably more calcium carboxzate reaches the inside of the fibers since the fiber walls are still soaked, thereby facilitating penetration of, for example, milk of lime. On the other hand it is also attributed to that, for a desired filler content in the paper, a portion of the filler is bonded inside the lumen o~the fibers. Therefore the fiber bonding points oa the outside surface of the fibers ate not blocked.
Fiber pulp is produced is pulp mills through various methods. The raw materials ate natural raw materials, such as (predominantly) wood, straw, jute, etc. Wood for example is cooked in a cooking process and the pulp fibers are leached out and are subjected to quality improvement in further process steps (i.e. bleach, washing, etc.). At the end of the process the pulp is thickened, dried and transported to the paper mills, for example in the form of bales.
There, the fiber pulps are again dissolved in Qulpe~rs and are prepared for the paper manufacturing process, for example refined and mixed with fillers. This can occur thtough direct addition of a filler, for exazuple calcium carbonate (CaC03), or through loading of the surfaces of the pulp fibers with a precipitated additive, for example, a filler such as calcium carbonate.
Loading with an additive, for example a filler, can occur through a chemical precipitation reacxi.an, especially through. a so-called "Fiber Loading'~'M" process, as described in addition to other publications, in U.S. Patent No. 5,223,090. In this type of "Fiber LoadingTM" process at least one additive, especially a filler is deposited onto the ru.oistened fiber surfaces of the fibrous material. The chemical precipitation reaction occurs preferably directly on the fiber surfaces.
voroz~s.us The fibers can for example be loaded with calcium carbonate. Calcium oxide and~ot calcium hydroxide are added to the moist, disintegrated fibrous material so that at least a part of this associates itself with the water that is contained in the fibrous material.
The so treated fibrous material is subsequently treated with carbon dioxide.
S When adding the medium containing the calcium oxide andlox the calcium hydroxide to the fiber stock suspension, a chemical reaction with exotherntal characteristics occurs. The calcium, hydroxide should preferably be added in liduid form (milk of lime).
'his implies that the wager that is possibly embedded in or added to the fibrous materials of the fiber stock suspension is riot absolutely necessary for the start and devet.~pme,a ofthe cremxcal aeavu~,u.
i0 SUMMARY OF THE ~1WENTION
~'he present invention provides a method ~or the production of fiber pulp that will increase tire efficiency of the utilized "Fiber Loadizxg''''~" process, as well as the economic efficiency of the raw material supply, especially i'or paper and cardboard production.
The present inventive method provides for the production of pulp for subsequent use in 15 the production of a fiber web, especially a paper or cardboard web. The manufachired pulp is first loaded with an additive by way of a chemical precipitation reaction. The loaded pulp is then dried at~d available for subsequent utilization or formulated into a suitable ~om1 for shipment.
The present inventive combination of the fiber pulp producctton with the loading process provides improved paper qualities. Since no drying occurs between the pulp production process 20 and the loading procESS, more calcium hydroxide or calcium oxide can penetrate through the fiber walls, thereby allowing a greater filler content at the inner cell wall suz~ace9 to be achieved after the precipitation pzocess, and increasing the desired effect through loading. Compared with fiber pulp to which ~ller (calcium carbonate) was added in the conventional method, the voxoz~s.us consistencies, optical characteristics, the specific volume (cm3/g) and the porosity, as well as the formation of the produced paper can be increased or improved.
An additional advantage of the present invention is that the fibers can be loaded. centrally, at the pulp mill. Therefore, only one single larger loading station for all the pulp mill customers combined is necessary. In contrast, if the loading process is decentralized, then ata. individual loading station is required for each customer. Overall, this loading process is less ei~cient due to cumulative longer downtimes and set-up times.
An additional advantage is found in that the pulp which is loaded with precipitated filler is easier to thicken and accordingly easier to dry. This results in pulp slabs that are produ~.Pxi ~r the pulp mill for shipment and that are generally several tithes thicket than paper (> 1000 g/ma) can be dried economically to a much higher level of dry content than previously. Since correspondingly less water needs to be ttansported, shipping costs are reduced. At the same time considerable energy savings are possible when producing the same shipping dxy content.
A further advantage is that due to the combination ofthe pulp production and the loading processes, the strength potential of the fibers, and accordingly, the strength of the paper that is subsequently produced in the paper mill, can be considerably increased or, that less fiber material is required for a given paper consistency. On the one hand this is attributed to the fact that through the combination of the loading pxocess at the time of the pulp production, considerably more calcium carboxzate reaches the inside of the fibers since the fiber walls are still soaked, thereby facilitating penetration of, for example, milk of lime. On the other hand it is also attributed to that, for a desired filler content in the paper, a portion of the filler is bonded inside the lumen o~the fibers. Therefore the fiber bonding points oa the outside surface of the fibers ate not blocked.
vozo2~a.rJs In accordance with an advantageous practical arrangement of the present invention, the fiber pulp is subjected to bleaching, either after, or in combination with the fiber loading process.
At least one bleaching agent such as peroxide, chlorine, oxygen, ozone and/or similar agents can be added to the fiber pulp. Bleaching may also occur in multiple stages with various bleaching ageo~ts. It is especially advantageous that the bleaching process can be combined after the "Fiber Loading'''A'" process with the bleaching process that i,s generally conducted in the pulp mill. This reduces the expenditure for the chemical reagent preparation, as well as the expenditure for waste handling and reprocessing of the waste products accordingly.
Accordi..~.g to an advantageous armngem.~t of 'he present invention the fiber pulp possesses a dry content after the drying process that is greater than 80%, especially greater than 85%, advantageously greater than 90% and preferably greater than 95%. If necessary, the pulp may be refined after the loading process, thereby still furfiher increasing the level of &eeness and strength potential. As already mentioned, the ~xber pulp can be loaded, especially with precipitated calcium carbonate.
The pulp production process can for example include the coolang of natural fibers.
Advantageously, the pulp is supplied in the form of bales, rolls or similar forms for filzther use ox for shipment. The present invention is also applicable with semu-fiber pulp and mechanical pulps (stone ground wood, GMP, brown mechanical pulp, refiner mechanical pulp RMP, thermo-mechanical pulp TMP, C"TMP).
The present invention can be utilized advantageously with fiber pulps that are produced according to the sulfate process andlor according to the sulfite process. In the sulfate pulping process calcium hydroxide is used for the chemical recovery. l;lere too, a clear syl~ergetic effect is achieved by the present inventive combination of the relating process steps. In addition, it is advantageous when considering the economic supply of raw materials, a fiber pulp that was VOIU278.Us produced according to the present inventive process is used in producing a fiber web, especially a paper or cardboard web.
When loading the fibers with, for example a filler, calcium carbonate (CaC03) is deposited on the moistened fiber surfaces by adding calcium oxide (Ca0) and/or calcium hydroxide (Ca(OI-1]Z) to the moist fiber material, whereby at least a part of which can associate itself with the water of the fibrous stock volume. The thereby treated fiber material is they treated with carbon dioxide (C02). The term 'moistened fiber surfaces" can encompass all moistened surfaces of the individual fibers. This specifically also includes the scenario where the fibexs are loaded w~~th calci~,~ carbonate or any other desired precip;~ant cn tbcir ou~siu surfaces as well as on their. inside (Lumen).
According to the present invention the fibers are loaded with the filler calcium carbonate, whereby the loading onto the moistened fiber surfaces occurs through a so-called "Fiber LoadingTM" process, as described in U.S. Patent No. 5,223,090. 1.n this "Fiber Loading'iM"
process the carbon dioxide with the calcium hydroxide reacts to water and calcium carbonate.
BRIEF DESC)~PT'ION OF THE D~tAWINGS
The above-mentioned and other features and advantages of this invention, and the manner of attaining them, will become more apparent and the invention will be better understood by reference to the following description of an embodiment of the invention taken in conjunetivn with the a,ccompaaying drawing, which is a schematic view of an embodiment of the present invention. 'fb~e exemplification set out herein illustrates one preferred ernbodim.ent of the invention, in one form, and such exemplification is not to be construed as limiting the scope of the invention, in any manner.
At least one bleaching agent such as peroxide, chlorine, oxygen, ozone and/or similar agents can be added to the fiber pulp. Bleaching may also occur in multiple stages with various bleaching ageo~ts. It is especially advantageous that the bleaching process can be combined after the "Fiber Loading'''A'" process with the bleaching process that i,s generally conducted in the pulp mill. This reduces the expenditure for the chemical reagent preparation, as well as the expenditure for waste handling and reprocessing of the waste products accordingly.
Accordi..~.g to an advantageous armngem.~t of 'he present invention the fiber pulp possesses a dry content after the drying process that is greater than 80%, especially greater than 85%, advantageously greater than 90% and preferably greater than 95%. If necessary, the pulp may be refined after the loading process, thereby still furfiher increasing the level of &eeness and strength potential. As already mentioned, the ~xber pulp can be loaded, especially with precipitated calcium carbonate.
The pulp production process can for example include the coolang of natural fibers.
Advantageously, the pulp is supplied in the form of bales, rolls or similar forms for filzther use ox for shipment. The present invention is also applicable with semu-fiber pulp and mechanical pulps (stone ground wood, GMP, brown mechanical pulp, refiner mechanical pulp RMP, thermo-mechanical pulp TMP, C"TMP).
The present invention can be utilized advantageously with fiber pulps that are produced according to the sulfate process andlor according to the sulfite process. In the sulfate pulping process calcium hydroxide is used for the chemical recovery. l;lere too, a clear syl~ergetic effect is achieved by the present inventive combination of the relating process steps. In addition, it is advantageous when considering the economic supply of raw materials, a fiber pulp that was VOIU278.Us produced according to the present inventive process is used in producing a fiber web, especially a paper or cardboard web.
When loading the fibers with, for example a filler, calcium carbonate (CaC03) is deposited on the moistened fiber surfaces by adding calcium oxide (Ca0) and/or calcium hydroxide (Ca(OI-1]Z) to the moist fiber material, whereby at least a part of which can associate itself with the water of the fibrous stock volume. The thereby treated fiber material is they treated with carbon dioxide (C02). The term 'moistened fiber surfaces" can encompass all moistened surfaces of the individual fibers. This specifically also includes the scenario where the fibexs are loaded w~~th calci~,~ carbonate or any other desired precip;~ant cn tbcir ou~siu surfaces as well as on their. inside (Lumen).
According to the present invention the fibers are loaded with the filler calcium carbonate, whereby the loading onto the moistened fiber surfaces occurs through a so-called "Fiber LoadingTM" process, as described in U.S. Patent No. 5,223,090. 1.n this "Fiber Loading'iM"
process the carbon dioxide with the calcium hydroxide reacts to water and calcium carbonate.
BRIEF DESC)~PT'ION OF THE D~tAWINGS
The above-mentioned and other features and advantages of this invention, and the manner of attaining them, will become more apparent and the invention will be better understood by reference to the following description of an embodiment of the invention taken in conjunetivn with the a,ccompaaying drawing, which is a schematic view of an embodiment of the present invention. 'fb~e exemplification set out herein illustrates one preferred ernbodim.ent of the invention, in one form, and such exemplification is not to be construed as limiting the scope of the invention, in any manner.
voxoz~s.us DETAILED DESCRIPTION OF THE INVENTION
Referring now to the drawing, an initial process step 10 includes a fiber pulp preparation.
and production. The fiber pulp created through this production process is then loaded with an addifiive, for example a ~xller in a subsequent process step 12 by way of a chemical precipitation S reaction.
Especially calcium oxide and/or calcium hydroxide (slaked lime) is added to the fiber material irt such a way that at least a portion of this can, associate itself with the water that is contained in the fiber material, i.e. between the fibers, in, the hollow fibers and in their walls, thus ereatmg the following chemical reaction:
Ca0 + 1-IZO --> Ca(OH~
Slaking of caustic lime calcium hydroxide The fiber material is then treated with. carbon dioxide (C02) in the relevant reactor, so that calcium carbonate (CaCO3) is extensively deposited on the moistened fiber surfaces. This results in the following chemical reaction:
Fiber Loading: Ca(OH)2 + COZ --~ CaC02 + H20 (Calcium carbonate + water) Thickening and drying of the pulp (see process step 1.4) occurs following this fiber loading process. The loaded, thickened and dried pulp is then prepared for application or for shipment 16 (i.e. bales, roles, etc.).
While this invention has been described as having a preferred design, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. Further, this application is intended to cover such departures froze the present voxoz~a.Us disclosure as come within known or customary practice in the art to which this i.nventian pertains and which fall within the limits of the appended claims.
Referring now to the drawing, an initial process step 10 includes a fiber pulp preparation.
and production. The fiber pulp created through this production process is then loaded with an addifiive, for example a ~xller in a subsequent process step 12 by way of a chemical precipitation S reaction.
Especially calcium oxide and/or calcium hydroxide (slaked lime) is added to the fiber material irt such a way that at least a portion of this can, associate itself with the water that is contained in the fiber material, i.e. between the fibers, in, the hollow fibers and in their walls, thus ereatmg the following chemical reaction:
Ca0 + 1-IZO --> Ca(OH~
Slaking of caustic lime calcium hydroxide The fiber material is then treated with. carbon dioxide (C02) in the relevant reactor, so that calcium carbonate (CaCO3) is extensively deposited on the moistened fiber surfaces. This results in the following chemical reaction:
Fiber Loading: Ca(OH)2 + COZ --~ CaC02 + H20 (Calcium carbonate + water) Thickening and drying of the pulp (see process step 1.4) occurs following this fiber loading process. The loaded, thickened and dried pulp is then prepared for application or for shipment 16 (i.e. bales, roles, etc.).
While this invention has been described as having a preferred design, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. Further, this application is intended to cover such departures froze the present voxoz~a.Us disclosure as come within known or customary practice in the art to which this i.nventian pertains and which fall within the limits of the appended claims.
voroz~g.trs Component identification Fiber pulp production process 12 Fiber loading process 14 Thickenixag~ Dry'mg 16 Shippin4g VOI0278.US
Claims (15)
1. A method for the production of pulp for subsequent use in the production of a fiber web, including the steps of:
loading the pulp with an additive by way of a chemical precipitation reaction;
and drying the pulp for at least one of a subsequent utilization and a formulation for shipment.
loading the pulp with an additive by way of a chemical precipitation reaction;
and drying the pulp for at least one of a subsequent utilization and a formulation for shipment.
2. The method of claim 1, further including the step of bleaching the pulp.
3. The method of claim 2, wherein the pulp is subjected to at least one bleaching agent.
4. The method of claim 3, wherein said at least one bleaching agent is at least one of a peroxide, a chlorine, an oxygen and an ozone.
5. The method of claim 4, wherein said bleaching step includes a plurality of stages, at least one said stage including said at least one bleaching agent.
6. The method of claim 1, wherein the pulp after said drying step possesses a dry content greater than 80%.
7. The method of claim 6, wherein said dry content is greater than 85%.
8. The method of claim 6, wherein said dry content is greater than 90%.
9. The method of claim 6, wherein said dry content is greater than 95%.
10. The method of claim 1, further including a step of refining the pulp after said loading step.
11. The method of claim 1, wherein the pulp is loaded with a precipitated calcium carbonate.
12. The method of claim 1, further including the step of cooking at least one natural fiber.
13, The method of claim 1, wherein the pulp is supplied in a form of at least one of bales and rolls for at least one of said subsequent utilization and said formulation for shipment.
14. The method of claim 1, wherein the pulp is produced according to at least one of a sulfate process sad a sulfite process.
15. The method of claim 1, wherein said fiber web is at least one of a paper web and a cardboard web.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10120526.0 | 2001-04-26 | ||
| DE10120526A DE10120526A1 (en) | 2001-04-26 | 2001-04-26 | Process for the production of pulp |
| PCT/EP2002/001611 WO2002088187A2 (en) | 2001-04-26 | 2002-02-15 | Method for the production of woodpulp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2445340A1 true CA2445340A1 (en) | 2002-11-07 |
Family
ID=7682850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002445340A Abandoned CA2445340A1 (en) | 2001-04-26 | 2002-02-15 | Method for the production of woodpulp |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20040084161A1 (en) |
| EP (1) | EP1397551A2 (en) |
| BR (1) | BR0205435A (en) |
| CA (1) | CA2445340A1 (en) |
| DE (1) | DE10120526A1 (en) |
| WO (1) | WO2002088187A2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004060405A1 (en) * | 2004-12-14 | 2006-07-06 | Voith Paper Patent Gmbh | Method and device for loading suspension-containing fibers or pulp with a filler |
| DE102007020324A1 (en) * | 2007-04-30 | 2008-11-06 | Voith Patent Gmbh | Process for the formation of calcium carbonate in a pulp suspension |
| DE102007028539A1 (en) * | 2007-06-21 | 2008-12-24 | Voith Patent Gmbh | Process for forming calcium carbonate in a pulp suspension |
| FI125278B (en) * | 2010-08-20 | 2015-08-14 | Upm Kymmene Corp | Process for precipitating calcium carbonate and using the process |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2599093A (en) * | 1948-03-17 | 1952-06-03 | Vanderbilt Co R T | Pigmented cellulose fiber |
| US4510020A (en) * | 1980-06-12 | 1985-04-09 | Pulp And Paper Research Institute Of Canada | Lumen-loaded paper pulp, its production and use |
| US5096539A (en) * | 1989-07-24 | 1992-03-17 | The Board Of Regents Of The University Of Washington | Cell wall loading of never-dried pulp fibers |
| US5223090A (en) * | 1991-03-06 | 1993-06-29 | The United States Of America As Represented By The Secretary Of Agriculture | Method for fiber loading a chemical compound |
| MX9704911A (en) * | 1994-12-28 | 1997-10-31 | Minerals Tech Inc | Bleaching of filled paper. |
| US5665205A (en) * | 1995-01-19 | 1997-09-09 | International Paper Company | Method for improving brightness and cleanliness of secondary fibers for paper and paperboard manufacture |
| US5679220A (en) * | 1995-01-19 | 1997-10-21 | International Paper Company | Process for enhanced deposition and retention of particulate filler on papermaking fibers |
| FI100670B (en) * | 1996-02-20 | 1998-01-30 | Metsae Serla Oy | Process for adding filler to cellulose fiber based m assa |
| EP0960236B1 (en) * | 1997-02-11 | 2003-09-10 | Minerals Technologies Inc. | Lumen loading of mineral filler into cellulose fibers for papermaking |
| FI104502B (en) * | 1997-09-16 | 2000-02-15 | Metsae Serla Oyj | A method of making a paper web |
| ES2318885T3 (en) * | 1999-08-13 | 2009-05-01 | Georgia-Pacific France | MANUFACTURING PROCEDURE OF A PAPER SHEET THAT INCLUDES THE SETTING OF A MINERAL LOAD ON A CELLULOSICAL FIBERS. |
-
2001
- 2001-04-26 DE DE10120526A patent/DE10120526A1/en not_active Withdrawn
-
2002
- 2002-02-15 EP EP02702355A patent/EP1397551A2/en not_active Withdrawn
- 2002-02-15 CA CA002445340A patent/CA2445340A1/en not_active Abandoned
- 2002-02-15 WO PCT/EP2002/001611 patent/WO2002088187A2/en not_active Application Discontinuation
- 2002-02-15 BR BR0205435-3A patent/BR0205435A/en not_active Application Discontinuation
-
2003
- 2003-10-22 US US10/691,276 patent/US20040084161A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| WO2002088187A3 (en) | 2003-03-27 |
| EP1397551A2 (en) | 2004-03-17 |
| BR0205435A (en) | 2003-05-06 |
| DE10120526A1 (en) | 2002-10-31 |
| US20040084161A1 (en) | 2004-05-06 |
| WO2002088187A2 (en) | 2002-11-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100547492B1 (en) | The production method of pulps and its paper products from bamboo | |
| EP1883731B1 (en) | Modified kraft fibers | |
| EP2082092B1 (en) | Modified kraft fibers | |
| US20160024713A1 (en) | Chemical activation and refining of southern pine kraft fibers | |
| US6235150B1 (en) | Method for producing pulp and paper with calcium carbonate filler | |
| RU2573675C2 (en) | Freeness of paper products | |
| US4260452A (en) | Production of paper pulp from sugar mill bagasse | |
| US20050045288A1 (en) | Bleached, mechanical paper pulp and the production method therefor | |
| US7179347B2 (en) | Method for fiber stock preparation | |
| KR100662043B1 (en) | The production method of pulps and its paper products from bamboo | |
| CA2636454A1 (en) | Method of loading a pulp suspension with filler | |
| JP2007501337A (en) | Method for filling a fiber material suspension and apparatus for carrying out the method | |
| US7291247B2 (en) | Absorbent sheet made with papermaking fibers with durable curl | |
| CA2445340A1 (en) | Method for the production of woodpulp | |
| US20060113051A1 (en) | Method for creating a fibrous substance suspension used for producing a tissue web or hygiene web | |
| US4578147A (en) | Process for manufacturing groundwood pulp while maintaining a high and uniform moisture content in the wood in the grinding zone | |
| JP4738662B2 (en) | Newspaper | |
| JP2002517173A (en) | Bleaching method of lignocellulose pulp without chlorine | |
| USRE28777E (en) | Refining of vegetable matter and delignification of the refined matter with chlorine dioxide | |
| EP1793034A1 (en) | A system for causing mechanical processing of a fibre suspension | |
| CN115836150A (en) | High-yield cooking method | |
| JPH11302990A (en) | Production of deinked pulp having high opacity | |
| Sykes et al. | Novel bleaching of thermomechanical pulp for improved paper properties |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |