CN101573490A - Method for the production of tissue paper - Google Patents
Method for the production of tissue paper Download PDFInfo
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- CN101573490A CN101573490A CNA2007800479387A CN200780047938A CN101573490A CN 101573490 A CN101573490 A CN 101573490A CN A2007800479387 A CNA2007800479387 A CN A2007800479387A CN 200780047938 A CN200780047938 A CN 200780047938A CN 101573490 A CN101573490 A CN 101573490A
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- 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
- D21C3/00—Pulping cellulose-containing materials
- D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
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- 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
- D21C3/00—Pulping cellulose-containing materials
- D21C3/22—Other features of pulping processes
- D21C3/222—Use of compounds accelerating the pulping processes
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Abstract
The invention relates to a method for the production of a tissue web (1) produced from a material suspension comprising fibers. To this end, the volume and the tear length is to be improved, with minimized freeness degree, such that the material suspension comprises lignocellulosic pulp of wood or annuals, which has a tear length of more than 6.5 km at 12 DEG SR, or a tear length of more than 8.0 km at 15 DEG SR, and a lignin content of at least 15% in relation to the otro pulp for coniferous wood in an unbleached state, or a tear length of more than 4.5 km at 20 DEG SR, and a lignin content of at least 12% in relation to the otro pulp for hardwood in an unbleached state, or a tear length of more than 3.5 km at 20 DEG SR, and a lignin content of at least 10% in relation to the otro pulp for annuals in an unbleached state.
Description
The present invention relates to the preparation method of the tissue paper width of cloth (tissue web), the described tissue paper width of cloth is prepared by the material suspended liquid that comprises fiber (stock suspension).
The invention still further relates to the preparation method of the material suspended liquid that is used in particular for preparing the tissue paper width of cloth.
At present, tissue product is mainly from complete cellulosic material, particularly sulfate pulp preparation.
The only limited purposes of fibrous material of mechanical system preparation is used widely because the strength characteristics of the yellow trend of material and difference has hindered it.
Common mixing ratio between long fiber material and the staple fibre material was 50: 50 scope.
The porous of tissue paper (tissue paper) and permeability key are to be determined by the beating degree of fiber in the material suspended liquid of preparation tissue paper.
Herein, high beating degree needs to have in the suspension the thin material of high-load, but this causes lower porous and permeability.
In addition, high beating degree causes the high water retention value of fiber in the material suspended liquid, and this shows that tissue paper is difficult to dehydration during its preparation.
When machine speed was high, the aridity of water separation capability during regular meeting causes preparing of difference was too low.
For example, at Flying Dutchman (Yankee drying cylinder) before, need certain aridity to contact the perk that causes because of hot circumferential surface with tissue paper drying cylinder (tissue drying cylinder) to prevent tissue paper web.
In addition, described tissue paper must the tool tear resistance.Tear strength (tearing strength) is decided by the beating degree and the preparation method of fiber.In order to improve tear strength, tissue paper must be reinforced (consolidated) during its preparation.In order to obtain high tear strength, thin material's proportion also must be high.
Thereby, the requirement of tear strength is just contradicted with requirement to water absorbing capacity, absorbability and water separation capability.
Therefore, the objective of the invention is under the situation of possible minimum beating degree the tissue paper that preparation has high specific volume and high as far as possible breaking length.
According to the present invention, this purpose is achieved in that material suspended liquid contains the ligno-ccllulose fibrous material of being made by timber or annual plant, for ligno-ccllulose fibrous material without the needle timber of bleached state, have 12 ° of SR greater than the breaking length of 6.0km or at 15 ° of SR greater than the breaking length of 7.5km and in the lignin content of drying fibrous material at least 15%; Perhaps for ligno-ccllulose fibrous material, have at 20 ° of SR greater than the breaking length of 4.5km with in the lignin content of drying fibrous material at least 12% without the broad-leaved timber of bleached state; Perhaps for ligno-ccllulose fibrous material, have at 20 ° of SR greater than the breaking length of 3.5km with in the lignin content of drying fibrous material at least 10% without the annual plant of bleached state.
Comparing under the lower far away beating degree with used so far fiber, this fiber has shown intensity values.Fibrous material of the present invention just can form good binding with adjacent fiber under lower beating degree, therefore also consume lower refined stock energy.
Advantageously, the lignin content without the fibrous material of bleaching under the situation of needle timber, can account at least 15%, preferably at least 18%, especially at least 21% of drying fibrous material; Under the situation of broad-leaved timber, can account at least 12%, preferably at least 14%, especially at least 16% of drying fibrous material; Under the situation of annual plant, can account at least 10%, preferably at least 12% and especially at least 19% of drying fibrous material.
The lignin content of fibrous material is high more, and the loss of wooden material is just low more during the preparation fibrous material.
In this case, might realize fully even higher intensity level.Therefore, needle timber fibre material should be greater than 7km in the breaking length of 12 ° of SR, is preferably greater than 7.5km and especially greater than 8km.Needle timber fibre material should be greater than 9km in the breaking length of 15 ° of SR, is preferably greater than 9.5km and especially greater than 10km.
The breaking length of broad-leaved timber fibre material should be greater than 6km under the beating degree of at least 12% lignin content and 20 ° of SR, is preferably greater than 7km and especially greater than 7.5km.
The breaking length of annual fiber material should be greater than 3.5km at 20 ° of SR, is preferably greater than 4km and especially greater than 4.5km.
Yet fibrous material of the present invention is not only high outstanding because of breaking length.And the bulk strength level also is high.
If fibrous material of the present invention is bleached processing, can improve fibre property significantly.Many application that whiteness is had higher requirements all require to bleach processing.Yet it also is in order to set and to improve fibre property that bleaching is handled.Handle through bleaching, can increase breaking length.
Thereby, material suspended liquid should contain the ligno-ccllulose fibrous material of being made by timber or annual plant, wherein, for ligno-ccllulose fibrous material, have at 15 ° of SR greater than the breaking length of 7.5km with in the lignin content of drying fibrous material at least 13% through the needle timber of bleached state; Perhaps for ligno-ccllulose fibrous material, have at 20 ° of SR greater than the breaking length of 5.0km with in the lignin content of drying fibrous material at least 10% through the broad-leaved timber of bleached state; Perhaps for ligno-ccllulose fibrous material, have at 20 ° of SR greater than the breaking length of 5.5km with in the lignin content of drying fibrous material at least 10% through the annual plant of bleached state.
Herein, higher breaking length also is favourable.Thereby the breaking length of needle timber fibre material should be preferably greater than 10km greater than 9km when 15 ° of SR.
Broad-leaved timber fibre material should be greater than 5.5km in the breaking length of 20 ° of SR, and the annual fiber material should be greater than 5km in the breaking length of 25 ° of SR, is preferably greater than 5.5km and especially greater than 6km.
In order to utilize high specific volume and the high-intensity advantage under possible minimum beating degree best, described material suspended liquid should only contain above-mentioned ligno-ccllulose fibrous material.
Yet for a lot of application, described material suspended liquid is only partly formed by such ligno-ccllulose fibrous material, is exactly enough.In this case, advantageously, the fibrous material of described material suspended liquid 20～80%, preferred 30～50% is formed by above-mentioned ligno-ccllulose fibrous material.
After the tissue paper width of cloth forms, preferably in dehydration it is imported between superstructureization (structured) permeable belt and bottom permeable belt, wherein pressure is applied on top band, the tissue paper width of cloth and the bottom band along dewatering period.
The pressure that is applied on the device that comprises top band, the tissue paper width of cloth and bottom band can produce by air-flow and/or mechanical presses power.
Preferably, during dehydration, gas at first flows through the top band, flows through the tissue paper width of cloth then, flows through the bottom band then.In this case, dehydration occurs on the direction of bottom band.
Except the gas percolation, or to the replacement of gas percolation, advantageously, during dehydration, comprise that with described some zone importing at least of the device of top band, the tissue paper width of cloth and bottom band is subjected between the compressive zone (press belt) and smooth surface of tension force, wherein, described compressive zone acts on the band of top and described bottom band is carried on the described smooth surface.
Preferably, described air-flow flows through the described device that comprises top band, the tissue paper width of cloth and bottom band at least at dewatering period on some zone, makes dehydration be undertaken by the pressure and the gas percolation of compressive zone simultaneously.
Experiment shows that the air-flow that flows through the tissue paper width of cloth should be along dewatering period and amounts to about 150m
3The length that per minute is every meter.
For the tissue paper width of cloth is fully dewatered, compressive zone should be in 30kN/m at least, under the tension force of preferred 60kN/m and especially 80kN/m at least.
Realize the dehydration good to the tissue paper width of cloth for mechanical tension that can be by compressive zone and based on the air-flow that flows through compressive zone, described compressive zone should have open area (open area) greater than 50% and at least 15% contact area
Described smooth surface preferably forms by the circumferential surface of roller.Described air-flow can be advantageously by roller and/or be arranged on the negative pressuren zone (suctionzone) in the malleation cover (positive pressure hood) above the band of top and produce.
During preparation ligno-ccllulose fibrous material of the present invention, importantly, at least a certain proportion of described material suspended liquid is prepared by following steps by timber or annual plant, described timber or annual plant are for needle timber, and lignin content is at least 15%, for broad-leaved timber, lignin content is at least 12%, for annual plant, lignin content is at least 10%, and each situation is all in based on drying fibrous material:
-preparation chemical reagent solution, it is for needle timber, has chemical reagent greater than 5% (in NaOH), or for broad-leaved timber, has chemical reagent greater than 3.5% (in NaOH), or greater than the chemical reagent of 2.5% (in NaOH), under each situation all by the oven dry amount of used timber
-with the bath raio of regulation described chemical reagent solution is mixed with timber or annual plant,
-described chemical reagent solution and timber or annual plant are heated to above the temperature of room temperature, then
(the 1st scheme)
-remove free-pouring chemical reagent solution and
-vapor phase boiling timber or annual plant,
Perhaps (the 2nd scheme)
-in liquid phase in the presence of chemical reagent solution boiling timber or annual plant and
-free-pouring chemical reagent solution is separated with timber or annual plant.
The inventive method based on the fact be, to have used before being higher than the usually chemical reagent of amount in order to prepare the fibrous material of high yield.For needle timber, the chemical reagent greater than 5% is significantly higher than previous industry and makes fibrous material used chemical reagent amount usually, also is like this greater than 3.5% chemical reagent with for annual plant greater than 2.5% chemical reagent for broad-leaved timber.The high consumption of chemical reagent produces the fibrous material with good productive rate and excellent in strength characteristic like this.Thereby, for needle timber, under the beating degree of 12 ° of SR～15 ° SR, recorded breaking length, but also recorded greater than 9km with greater than the breaking length of 10km greater than 8km.For broad-leaved timber, under the beating degree of 20 ° of SR, recorded breaking length, but also recorded greater than 6km with greater than the breaking length of 7km greater than 5km.Thus, reach required high intensity level.
Be considered to the inventive method outstanding advantage be under extremely low beating degree, reached such intensity level, and this to obtain to up to now high yield fibrous material.The fibrous material of prior art under the beating degree of 12 ° of SR～15 ° SR, or shows unacceptable strength level for broad-leaved timber fibrous material for needle timber fibrous material under the beating degree of 20 ° of SR.Up to now, the fiber that produces under these low beating degree of known fibrous material does not show intensity property enough for the Economic Application of these fibers.
Specifically, suitable annual plant is bamboo, fiber crops, straw, bagasse, wheat, awns genus (Miscanthus) etc.
On the other hand, under the beating degree of 12 ° of SR～15 ° SR, had greater than 8km, the breaking length of 11km at most by the fibrous material of the inventive method preparation, and pressed 100g/m
2The paper restatement greater than 70cN to greater than the tear strength of 110cN.In addition, these little beating degrees can realize with specific low refining energy, be less than the 500kWh/t fibrous material for needle timber; Under the situation of broad-leaved timber, to the needs of refining energy can in addition less than the 300kWh/t fibrous material.Discovery is reaching high strength level for needle timber under the low beating degree of 12 ° of SR～15 ° SR and for needle timber under 20 ° of low beating degrees below the SR, this discovery is an essential part of the present invention.
For lignin content greater than 15% needle timber fibrous material, lignin content greater than 12% broad-leaved timber fibrous material and lignin content greater than 10% annual plant, the unknown so far this high intensity level under low beating degree.Yet, to having even the fibrous material of higher lignin content also can keep this high intensity level.The inventive method even also be suitable for prepare by drying fibrous material greater than 18%, be preferably greater than 21%, advantageously greater than the needle timber fibrous material of 24% lignin content.Lignin content greater than 14%, be preferably greater than 16%, be preferably greater than especially 18% broad-leaved timber fibrous material and lignin content greater than 10%, be preferably greater than 12%, be preferably greater than 19% annual plant especially and equally also can prepare with the inventive method, and show high strength level.
The composition that is used for the chemical reagent solution of boiling can limit according to the timber that is used for boiling or annual plant and required fibrous material character.Usually, only use the sulphite composition.As an alternative or as a supplement, also can add sulfide composition.Carrying out boiling with the sulphite composition can not be interfered because of the existence of sulfide composition.Industrial common use sodium sulfite, but also can use ammonium sulfite or potassium sulfite, or use magnesium bisulfite.Especially, when using a large amount of sulphite, can not use the alkali composition, even also do not reached the high pH value that promotes boiling because do not add the alkali composition.
For regulating the pH value and helping delignification, also measurable adding acid and/or alkali composition.The alkali composition of industrial use is generally NaOH (NaOH).Yet, also can use carbonate, particularly sodium carbonate.Only otherwise point out in addition, relevant with the chemical reagent amount of boiling method herein, as all calculating with total chemical reagent use amount or all statements relevant with the alkali components in proportions and expressing according to NaOH (NaOH) with the sulphite composition.
Measurable adding acid is as sour composition, to set required pH value.But preferably add SO
2, add with aqueous solution when needing.It is cheap and is easy to obtain, particularly when for example treated during with further use after boiling based on the chemical reagent solution of using of sodium sulfite.
Cognitive to use the advantage of quinone composition for high yield boiling of the present invention, this is counted as independent achievement of the present invention.Quinone composition, particularly anthraquinone still are used to prepare the paper pulp with minimum lignin content so far, with the effect that prevents from when finishing near boiling carbohydrate not to be expected.By adding the quinone composition, can make timber continue boiling and decompose fully substantially up to lignin.What occur as unknown before the quinone composition, unforeseeable character is that when preparation high yield paper pulp, the quinone composition obviously improves the speed that lignin decomposes.The time of boiling, the time that for example prepares aciculiform timber fibrous material can be shortened over half, can shorten more than 3/4 according to conditions of cooking.This significant effect can for example use minimum quinone to realize.For example, for example using, 0.005%～0.5% anthraquinone is best.Use maximum 1% anthraquinone also to produce required effect.Use is normally uneconomic greater than 3% anthraquinone.
Chemical reagent solution is by independent or multiple above-mentioned chemical reagent preparation.Usually add aqueous solution.As selection, also provide with an organic solvent or added organic solvent.The alcohol that mixes with water is methyl alcohol and ethanol particularly, for the fibrous material that is used to prepare high-quality, high yield provides special effective chemical reagent solution.The mixing ratio of water and alcohol can be with a few experiments to each feedstock optimization.
Be used to prepare productive rate according to the present invention and needle timber be at least 5% for the amount of the chemical reagent of at least 70% fibrous material, broad-leaved timber is at least 3.5%, with annual plant is at least 2.5%, under the various situations all by the timber of institute's boiling or the dries quantity of annual plant.The chemical reagent consumption to needle timber be maximum 15%, be maximum 10% to broad-leaved timber and be that the quality of the fibrous material of preparation demonstrates best result under maximum 10% the situation to annual plant.Under needle timber situation,, preferably add 9～11% chemical reagent by used drying wood.To broad-leaved timber, the chemical reagent use amount is lower to a certain extent, is preferably 4～10%, and is preferred especially 6～9%, and is 3～10% to annual plant.
As previously mentioned, do not need to set specific pH value fully.For example, only when utilizing special character that boiling reaches this paper pulp when (specifically, the special ratios of high whiteness, breaking length and tear strength), add acid before boiling and during the boiling or the alkali composition may be favourable.By a favourable embodiment of the present invention, no matter whole chemical reagent of selecting for use are why, alkali composition and sulfur dioxide (SO
2) between ratio can be set in the wide scope.Here, SO
2Representative as above-mentioned sour composition.Therefore, also can be with a kind of acid substitution SO
2Because the quinone composition that may add only is minimum, significantly be lower than 1% usually, it is negligible when therefore setting this ratio.Alkali composition between 5: 1～1.6: 1: SO
2Ratio be suitable for well implementing the inventive method and the fibrous material that obtains having high strength properties.Usually, the scope of particularly suitable is 2: 1～1.6: 1.Coordinate proportional composition according to the raw material of institute's boiling and the management by methods mode of respectively selecting for use (boiling temperature, digestion time, dipping).
Method of the present invention can be carried out in wide ph range.The use of alkali composition and sour components in proportions and sour composition or alkali composition can be set as follows, makes that the pH value when method begun is set at 6～11, preferred 7～11, preferred especially 7.5～10.The favourable alkaline pH value 8～11 of the inventive method is also promoted the effect of quinone composition.Method of the present invention is a tolerance pH value; Only need a small amount of chemical reagent for pH regulator.This cost to chemical reagent is favourable.
Under the situation that does not add sour composition or alkali composition in addition, for example to aciculiform timber, in the free-pouring chemical reagent solution when boiling finishes and in the organic principle that is dissolved in by boiling liquefaction wherein, the pH value of establishment is 5～9, is generally 6.5～9.The organic principle that is dissolved mainly comprises lignosulphonates.
With bath raio, promptly the amount ratio of drying wood or annual plant and chemical reagent solution is set at 1: 1.5～1: 6.Bath raio is preferably 1: 2～and 1: 4.In this scope, guaranteed well and simply the mixing and flood of material of institute's boiling.For aciculiform timber, bath raio is preferably 1: 3.5.For the timber fragment that big surface is arranged, bath raio also can be significantly higher with energy quick humidification and dipping.Simultaneously, the concentration of chemical reagent solution can be remained high so that the amount of liquid that is circulated does not become too big.
Preferred timber or the annual plant material that mixes or flood institute's boiling at elevated temperatures.Fragment and chemical reagent solution are heated to maximum 110 ℃, preferably arrive maximum 120 ℃, preferred especially to maximum 130 ℃, make timber fast and boiling uniformly.Advantageously, the mixing of wood chip or dip time are maximum 30 minutes, preferred maximum 60 minutes, and preferred maximum 90 minutes especially.In addition, each Best Times also depends on amount, bath raio, selected temperature and the boiling type (liquid phase or vapor phase) of chemical reagent.
Mix or the boiling of the lignocellulosic material of dipping should be under 120～190 ℃, preferably carry out under 140～180 ℃ with chemical reagent solution.To most of timber, boiling temperature is set at 150 ℃～170 ℃.Also can be set at higher or lower temperature, but in this temperature range, the energy consumption of heating and the acceleration of boiling are inter-related on economic relation.In addition, higher temperature can have a negative impact to the intensity and the whiteness of fibrous material.The pressure that produces by high temperature can be easily suitable design by boiling vessel be absorbed.The only several minutes time of common heating, maximum 30 minutes usually, preferred maximum 10 minutes, particularly when using Steam Heating.For example, carry out boiling and this chemical reagent solution must heat with fragment the time in liquid phase, then be maximum 90 minutes heat time heating time, is preferably maximum 60 minutes.
Digestion time is mainly selected according to required fibrous material character.For example under the situation of the low broad-leaved timber of vapor phase boiling lignin content, digestion time can foreshorten to 2 minutes.But when native lignin content was high in the timber of and institute's boiling low at boiling temperature for example, digestion time also can be as many as 180 minutes.If the initial pH value of boiling in neutral range, then can need long digestion time.Specifically, particularly under the situation of needle timber, digestion time is maximum 90 minutes.Digestion time is preferably maximum 60 minutes especially, advantageously maximum 30 minutes.60 minutes digestion time particularly is fit under the situation of broad-leaved timber.
Under the situation of annual plant, digestion time is maximum 90 minutes.Use quinone composition, particularly anthraquinone, digestion time can be reduced to maximum 25% of the anthraquinone situation that do not add.If do not use the quinone composition, for carrying out suitable boiling, required digestion time will prolong more than 1 hour, for example extended to 180 minutes from 45 minutes.
By a favourable embodiment of the inventive method, set digestion time according to selected bath raio.Bath raio is more little, and then the process time can be set shortly more.
With to needle timber greater than 5%, to broad-leaved timber greater than 3.5% with that the high chemical reagent consumption of annual plant at least 2.5% is prepared the high yield fibrous material is seemingly uneconomic at first view.But experiment shows a part that only consumes chemical reagent when part boiling lignocellulosic material.Most of chemical reagent is preceding or just be removed without use in boiling (liquid phase cooking) back in boiling (vapor phase boiling).The actual consumption of chemical reagent is lower than the amount of using in the cooked solution.
With the chemical reagent consumption amount be recorded as based on the chemical reagent amount of initial use remove or the separation chemistry reagent solution after and collect chemical reagent solution in case of necessity after the amount of chemical reagent, it is measured after defiber or with the chemical reagent solution of collecting.The chemical reagent consumption amount depends on the absolute magnitude by the chemical reagent that is used for boiling of the drying wood quality of institute's boiling.Boiling is high more with the use amount of chemical reagent, and the direct conversion ratio of chemical reagent is just low more.Suppose to have used chemical reagent, then for example only consume about 30% employed chemical reagent by drying wood quality 27.5%.But,, when using the chemical reagent by drying wood quality 15%, but consume 60% employed chemical reagent as what laboratory experiment confirmed.By the preferred embodiment of this method, the chemical reagent consumption amount of the inventive method is boiling chemical reagent input quantity maximum 80% when beginning, and is preferred maximum 60%, preferred maximum especially 40%, advantageously maximum 20%, and particularly advantageous is maximum 10%.
The chemical reagent consumption amount of 1 ton of fibrous material of preparation, by drying fibrous material (broad-leaved timber and needle timber or annual plant), be about 6%～14% sulphite and/or sulfide composition, and alkali composition and/or sour composition and the quinone composition when needing.According to the present invention, this chemical reagent amount is enough to prepare the fibrous material with regulation character.But, for guaranteeing consistent methods and results and can accessing specific, required fibre property, it is favourable using higher chemical reagent amount for boiling, and for example aforesaid dries quantity by timber material or annual plant mostly is 30% chemical reagent amount most.
Use the chemical reagent of this tittle to produce favourable effect during the beginning boiling, because the fibrous material that obtains by this way has unavailable so far character, particularly high intensity property and high whiteness.Especially, do not provide so far and can to the wide pH scope of alkaline range, produce boiling method in neutrality with high-intensity fibrous material.Be attractively especially to be economically, use and compare just the fibrous material of the present invention's preparation can the be pulled an oar beating degree of regulation of much lower energy requirement with known fibrous material.In addition, being 12 ° of SR～15 ° SR to needle timber and being under the low especially beating degree of 20 ° of SR, can realize high intensity to broad-leaved timber.
After timber is mixed and flooding with chemical reagent solution, perhaps after boiling, unnecessary chemical reagent is arranged in free-pouring liquid.Before boiling (the 1st scheme) or after boiling (the 2nd scheme) discharge surplus.By a favourable expansion scheme of the inventive method, collect removed chemical reagent solution, and its composition then is adjusted to the regulation composition to be reused for the preparation fiber.The composition that the chemical reagent solution of removing before or after boiling timber or annual plant sets when no longer having beginning.As previously mentioned, at least a portion be used for boiling chemical reagent boiling by infiltrating through material and/or when boiling, consume.Untapped chemical reagent can successfully be used further to next boiling.But the present invention proposes, and at first measures the composition of the chemical reagent solution of being removed, and then replenishes for example sulphite, alkali composition, quinone composition or other water or pure consumption ratio, forms with the regulation that produces next boiling once more.Such replenish step is also referred to as reinforcement (strengthening).
The remarkable advantage of such measure is considered to, no matter be under the situation about before boiling, removing or under situation about removing after the boiling, this chemical reagent solution really do not contain fully or only contain very small amount of when the chemical reagent solution of reusing through strengthening to the noisy material of next boiling meeting.The inventive method provides excessive boiling chemical reagent when being based on dipping, though use high chemical reagent amount just to begin to look like uneconomic method, but can move extremely economically, because removing or separating and strengthen of chemical reagent solution can be simply and implement at low cost.
Method of the present invention is controlled especially, made and only to decompose or dissolve the least possible raw materials used.Purpose is a kind of fibrous material of preparation, and to needle timber, it has the lignin content by drying fibrous quality at least 15%, preferred at least 18% lignin content, preferred especially 21% lignin content, advantageously at least 24% lignin content.To broad-leaved timber, purpose is to realize being at least 12% by drying fibrous quality lignin content, preferably at least 14%, especially preferably at least 16%, advantageously at least 18%.Under the situation of annual plant, preferred lignin content is 10～28%, especially 12～26%.
The productive rate of the inventive method counts at least 70% by used timber, is preferably greater than 75%, advantageously greater than 80%.This productive rate is relevant with the lignin content of the fibrous material that preamble provides.The original lignin content of timber is specific to kind.Loss of yield in the methods of the invention is mainly with lignin loss expression.In unspecific boiling method, the ratio of hydrocarbon significantly increases, and for example, this is because the mode that the boiling chemical reagent is not also expected with itself enters in the solution cellulose or hemicellulose.
Another favourable measure is, after the lignocellulosic material boiling becomes fiber and after the making beating that may carry out, remove still residual chemical reagent solution and with its supply with further use.In a preferred scheme, so further use can comprise two aspects.On the one hand be when the part boiling, to decompose or the organic material (mainly being lignin) that enters solution can be used further.For example make its burning to obtain the technology energy.Perhaps it is prepared in a different manner and uses.Be to reforming of crossing, so that it can be reused for the part boiling of lignocellulosic material on the other hand with untapped chemical reagent.This comprises the chemical reagent that preparation consumes.
According to a particularly preferred scheme of the inventive method, used chemical reagent solution utilizes in mode especially effectively.After the defiber and after the making beating that might carry out, wash this fibrous material, to replace chemical reagent solution as far as possible by water.The filtrate that produces in such washing and replacement operator contains a large amount of chemical reagent solutions and organic material.According to the present invention, before chemical reagent solution is reinforced and is supplied to next boiling, this filtrate is fed to chemical reagent solution removal or isolated.Chemical reagent and organic principle contained in filtrate can not disturb boiling.They in next boiling to the contribution of delignification, then predict its in chemical reagent solution content and when determining the required chemical reagent amount of boiling, consider its content.In addition, other chemical reagent that contains in filtrate is inertia in the boiling of being carried out; They can not disturb.Organic principle contained in filtrate also is inertia.In that they are used further when regulating chemical reagent solution after the next boiling, to produce the technology energy or otherwise to utilize.
Particularly advantageous is by such processing filtrate, can use less fresh water and less chemical reagent in boiling.Can obtain the organic material of the dissolving of maximum simultaneously.The economy of also having improved the inventive method is used in the improvement to the organic material that enters solution like this.
Hereinafter, describe the present invention in detail with a series of illustrative embodiments.
In the accompanying drawings:
Fig. 1 has shown the equipment of implementing the inventive method; With
Fig. 2 is second kind of equipment.
Yet, at first, explain in more detail in the illustrative embodiments hereinafter according to the details of the method for prepared product pulp suspension of the present invention.
Below experiment according to following design code evaluation:
The paper pulp of gained calculates productive rate after-raw material by the input of weighing and the boiling, they all after being dried to constant weight under 105 ℃ (adiabatic drying) weigh.
-measure lignin content by TAPPT T 222 om-98 with proflavine sulfate.Press TAPPI UM 250 and measure acid accumulator soluble lignin.
-the check paper of pressing Zellcheming Note Sheet V/8/76 preparation is measured the paper technological property.
-predict beating degree by Zellcheming Note Sheet V/3/62.
-predict bulk density by Zellcheming Instruction V/11/57.
-predict breaking length by Zellcheming Instruction V/12/57.
-predict tear strength by DIN 53 128 Elmendorf.
-predict tensile figure, tear index and burst index by TAPPI 220 sp-96.
-measure whiteness by the check paper of pressing Zellcheming Note Sheet V/19/63 preparation, it presses 11: 75 usefulness Datacolor of SCAN C elrepho 450x photometric determination; Whiteness provides with percentage by iso standard 2470.
-viscosity is measured by the NoteSheet V/36/61 of German paper pulp and paper chemist and amalgamated society of engineers (Zellcheming).
-as long as do not point out separately in addition that the statement of all % all is percetages by weight in this article.
-" oven dry " herein refers to be dried to " oven dry " material of constant weight under 105 ℃.
-if not explanation in addition, the chemical reagent that boiling is used provides with the percetage by weight of NaOH.
Embodiment 1: the boiling of needle timber in liquid phase
By the mixture of birch timber and pesudotsuga taxifolia wood chip through steam treatment (under 105 ℃ the saturated vapor 30 minutes) after with timber: cooked solution is that 1: 3 bath raio adds the sodium sulfite cooked solution.Total chemical reagent consumption is counted less than 15% by drying wood.By adding SO
2PH value during with the beginning boiling is adjusted to pH8.5～9.
Birch timber/chips mixtures with the chemical reagent solution dipping was heated to 170 ℃ in 90 minutes, boiling is 60 minutes under this maximum temperature.
Then by centrifugal removal, collection and analyze free-pouring liquid, do not use the device of liquid to strengthen being used for refluxing, and regulate usefulness by this way in order to next boiling.
Wood chip de-fibering through boiling.The fibrous material of Zhi Bei part amount grinds through different time by this way, to measure the intensity under the different beating degrees.The energy consumption of wood chip defiber that makes the part boiling is less than the 300kWh/t fibrous material.
The productive rate of this experiment counts 77% by used timber quality.
This corresponding to lignin content far above 20% fibrous material.The average tree cellulose content of birch timber counts 28% (Wagenfuehr, Anatomie des Holzes[Anatomy ofWood], VEB Fachbuchverlag, Leipzig, 1980) by the drying wood quality.The actual lignin content of this fibrous material is higher than 20%, because when boiling mainly be but be not only lignin and be decomposed.Carbohydrate (cellulose and hemicellulose) is also by minimal amounts of dissolved.The value that provides shows that boiling has good selectivity to lignin and breakdown of carbohydrates.
The unforeseeable height of whiteness, for greater than 55%ISO, this provides good initial basis for the following bleaching that may carry out, and can reach the whiteness of 75%ISO in bleaching.
In initial beating degree is under the situation of 12 ° of SR, and this material is at 1.87g/cm
3Proportion under had the breaking length of 6km.
For beating degree that fibrous material is pulled an oar is 15 ° of SR, need 20～30 minutes beating time.(pH6～pH9.4) what are, in 20 minutes beating times (beating degree is 12～15 ° of SR), beating degree all can be in narrow scope for the pH value no matter boiling begins.
Similarly, the initial pH value of boiling and be used to reach the required milling time of this beating degree what are no matter, all the beating degree at 15 ° of SR has been issued to high strength level.
Prepare fibrous material by the birch wood chip, the pH value that boiling begins is 9.4.
Total chemical reagent except 15% sodium sulfite and the NaOH of ratio (regulation), also add 0.1% anthraquinone by used timber amount.
Digestion time is 60 minutes.
Obtain down train value:
Productive rate (%): 81.1
Lignin content: 22.7
Whiteness (%ISO): 53.7
Breaking length (km): 9.6
Tear strength (cN; 100g/m
2): 75.0
The result who adds 0.1% anthraquinone is, can make digestion time reduce to 60 minutes from about 180 minutes under the constant situation of other conditions of cooking.This time income is valuable, at first is because fibrous material manufacturing works can be designed to more on a small scale.Further save possibility and be, only must in the extremely short time, keep the required temperature of boiling.
Measured in addition, under needle timber situation, total chemical reagent consumption drops to 5～15% value, still prepares the fibrous material with same good substantially character.The use of this result and anthraquinone is irrelevant.Anthraquinone works to quicken boiling, but also can be under the condition of not adding anthraquinone the required fibrous material of boiling.
Embodiment 3: the boiling of broad-leaved timber in liquid phase
With the eucalyptus wood chip after steam treatment with timber: cooked solution is that 1: 3 bath raio adds the sodium sulfite cooked solution.At this, this chemical reagent consumption is counted 10.5% (in NaOH) by the oven dry wood chip.
The material of dipping institute boiling 90 minutes, and the material of institute's boiling is heated to 170 ℃ maximum boiling temperature.Digestion time is 50 minutes.
The boiling of eucalyptus timber shows that these materials can use the specific energy input with defiber less than 250kWh/t to prepare.
The productive rate of these experiments is about 77% by used timber quality.In initial beating degree is under the situation of 14 ° of SR, and these materials are 2.05g/cm at proportion
3The time breaking length be 3.5km.These materials can be bleached 79.9%ISO in follow-up bleaching.
Experiment shows that the boiling in vapor phase is lower to the demand of total time.Compare with the boiling in liquid phase, be heated to maximum boiling temperature and carry out fasterly.So required time of actual boiling is identical with the boiling in liquid phase.When the vapor phase boiling, there is not free-pouring chemical reagent solution; It is being discharged from behind dipping and before boiling.Therefore, compare than the chemical reagent solution of discharging after the boiling in liquid phase, the organic substance of adding is less.Yet this quality to prepared fibrous material does not have obvious influence.
In the vapor phase boiling, can reach similar yield value, but the whiteness of prepared fibrous material is obviously lower in the vapor phase boiling.Maximum boiling temperature is dropped to 150 ℃ from 170 ℃ can produce tangible effect; Whiteness can improve.
The fibrous material for preparing in vapor phase has excellent intensity.Breaking length for example is measured as 10km and 11km at 15 ° of SR.Tear strength for example is determined as 82.8cN and 91.0cN.These are worth the best values corresponding to the accessible high lignin content fibrous material of the boiling in liquid phase, or even higher.For the fibrous material of high lignin content, suitable intensity level still is unknown in the prior art.
Can be summed up especially significantly by these embodiment, fibrous material of the present invention only needs beating energy consumption seldom just can form high breaking length under the situation that does not reduce tear strength.In 0～10 minute, reach 12 ° of SR of beating degree in all cases; In 5～30 minutes, common 10～20 minutes, reach 13 ° of SR of beating degree.For reaching 14 ° of SR of beating degree, the Jokro mill needs operation 30～40 minutes, and 15 ° of SR need 35～40 minutes to beating degree.The about 40 ° of SR of the beating degree of clearly pulling an oar need consume a large amount of making beating energy.Therefore, the special advantage of the inventive method is, just can obtain high-intensity fibrous material with very little energy consumption making beating.
Be used to be provided at and hereinafter be used for the equipment that the method according to this invention prepares the material suspended liquid of the tissue paper width of cloth and comprise pulper, in pulper, dried feed and semi-finished product raw material and waste paper are stirred in (slush) entry, and be transformed into can pumping state.Then, the material that forms is by this way infeeded mixing chamber.
In the making beating followed operation, with described material suspended liquid pull an oar 12 ° of SR or above beating degree.
In machine chamber (machine chest), described material suspended liquid plain boiled water (white water) high dilution, and infeed head box (headbox) 13.
No matter how described material suspended liquid obtains, for the preparation tissue paper importantly, the material suspended liquid that flows out from head box 13 has less than the beating degree of 20 ° of SR with greater than the breaking length of 4.5km.
Material suspended liquid 1 with above-mentioned character flows out from head box 13 by this way: its be injected into forming web (forming fabric) 14 and structurized, specifically be three-dimensional structureization with the inflow gap (ingoing gap) between 3, like this, formed tissue paper 1.
The side of forming web 14 oriented tissue papers 1 orientation, this side is smooth with respect to structuring band 3.
Here, the side that structuring band 3 points to tissue papers 1 has deepens the zone and with respect to the rising zone of deepening the zone, like this formation tissue paper 1 in the intensification zone of structuring band 3 and rising zone.The difference in height of deepening between zone and the rising zone is preferably 0.07mm～0.6mm.The area in zone of raising is preferred more than 10%, and is preferred especially more than 20% and preferred especially 25%～30%.
In illustrated illustrative embodiments, the device that comprises top band 3, tissue paper 1 and forming web 14 is round format roll 15 deflections, before tissue paper 1 left from forming web 14, tissue paper 1 dewatered basically by forming web 11, and tissue paper 1 upwards is transported to and is with on 4.
Be formed at 3 deepen the zone tissue paper 1 loose section (voluminous sections) than be formed at 3 raise the zone tissue paper 1 section have the paper basis weight of bigger volume and Geng Gao.
Therefore, because tissue paper 1 is formed on the structuring band 3, it has had three-dimensional structure.
But the formation of layer also can betide between the two-layer smooth forming web 14, has formed the essentially smooth tissue paper 1 that does not form three-dimensional structure like this.
During the dehydration after tissue paper 1 formation, tissue paper 1 is imported between structuring band 3 that is arranged on top and the bottom permeable belt 2 that forms felt, pressure is applied to structuring band 3 along dewatering period, tissue paper 1 and by this way with on 2 in dehydration: tissue paper 1 dewaters on 2 direction, as shown in the arrow in two width of cloth accompanying drawings.
During dewatering, tissue paper 1 is with being with 2,3 to be wrapped in around the roller 5.
Because during this dehydration, tissue paper 1 is dehydrated on 2 direction, because tissue paper 1 is gone up dehydration at structuring band 3 (formed tissue paper 1) on structural belt 3, loose section compressive strength is less than other section, thereby can keep the loose structure of these sections.
According to Fig. 1, in dehydration, on some sections, produce the pressure that makes tissue paper 1 dehydration at least simultaneously by air-flow with by mechanical presses power.
In this case, air-flow at first flows through structuring band 3, flows through tissue paper 1 then, flows through the bottom band 2 that forms felt then.The air-flow that flows through tissue paper 1 is the every rice paper width of cloth of about per minute length 150m
3
Under these circumstances, by the described air-flow of negative pressuren zone 10 generations of roller 5, the length of this negative pressuren zone 10 is 200mm～2500mm, preferred 800mm～1800mm, preferred especially 1200mm～1600mm.
The vacuum of negative pressuren zone 10 is-0.2 crust～-0.8 crust, preferred-0.4 crust～-0.6 crust.
About the performance by mechanical presses power and the dehydration randomly or additionally implemented by air-flow, about the equipment of the difference configuration of implementing this dehydration, the full content of PCT/EP2005/050198 is introduced into the disclosure of this paper simultaneously.
According to Fig. 1, described mechanical presses power is to produce like this: during dehydration, comprise structuring band 3, tissue paper 1 and be introduced into the compressive zone 4 that is subjected to tension force and the dewatering period 11 between the smooth surface with 2 device, compressive zone 4 acts on the structuring band 3, and is with 2 to be carried on the described smooth surface.
In this article, described smooth surface is formed by the circumferential surface of roller 5.
Described dewatering period 11 is limited by the parcel zone of compressive zone 4 around roller 5 circumferential surfaces basically, and described parcel zone is limited by the interval of two deflection roll 12.
The tension force that compressive zone 14 is subjected to is at least 30kN/m, preferably 60kN/m or 80kN/m at least, and have at least 25% the open area that accounts for its total surface area of pointing to top band 3 and at least 10% contact area.
Under specific situation, be presented as that compressive zone 4 that spiral connects net (spiral link fabric) has 51%～62% the open area that accounts for its total surface area of pointing to top band 3 and 38%～49% contact area.
About the structure of compressive zone, the full content of PCT/EP2005/050198 is introduced into the disclosure of this paper.
Aridity when tissue paper 1 leaves dewatering period 11 is 25%～55%.
Then, in the further dehydration after above-mentioned dehydration, tissue paper 1 is introduced into press nip (press nip) with structuring band 3, and the tissue paper in the press nip 1 is arranged between the smooth roll surface of structuring band 3 and Flying Dutchman 7.Here, described press nip is by the expansion press nip between Flying Dutchman 7 and the hoof compression roller (shoe press roll) 8.
The larger area that has of tissue paper 1 simultaneously reclines on the circumferential surface of Flying Dutchman 7, and the another side of tissue paper 1 abuts on the structuring band 3.
Here, the intensification of structuring band 3 zone and raise the zone so that loose section mode that is not extruded substantially in press nip form and be provided with each other.On the other hand, other sections are squeezed, and like this, have further increased the intensity of tissue paper 1.
Between above-mentioned two step dehydrations, further dehydration can be provided, it can be implemented by equipment 9.
Optionally, can carry out such setting to tissue paper 1, at tissue paper 1 by before the press nip, make its with structuring band 3 around finding time deflection roller (evacuated deflectionroll), described structuring roller is arranged on tissue paper 1 and finds time between the deflection roller (not shown).
As can be seen from Figure 2, air-flow can also produce by the malleation cover that is arranged on above the structuring band 3, and in this case, dehydration is implemented under the situation without any mechanical presses power, promptly opposite with Fig. 1, parcel roller 5 some sections compressive zone 4 on every side is not provided.
Claims (42)
1. the manufacture method of the tissue paper width of cloth (1), the described tissue paper width of cloth (1) is to be prepared by the material suspended liquid that comprises fiber, it is characterized in that, described material suspended liquid contains the ligno-ccllulose fibrous material of being made by timber or annual plant, for at fibrous material without the needle timber under the bleached state, have 12 ° of SR greater than the breaking length of 6.0km or at 15 ° of SR greater than the breaking length of 7.5km with in the lignin content of drying fibrous material at least 15%; Perhaps at fibrous material, have at 20 ° of SR greater than the breaking length of 4.5km with in the lignin content of drying fibrous material at least 12% without the broad-leaved timber under the bleached state; Perhaps at fibrous material, have at 20 ° of SR greater than the breaking length of 3.5km with in the lignin content of drying fibrous material at least 10% without the annual plant under the bleached state.
2. method according to claim 1 is characterized in that, without the lignin content of fibrous material of bleaching, under the situation of needle timber, for drying fibrous material at least 15%, be preferably at least 18%, especially be at least 21%; Under the situation of broad-leaved timber, for drying fibrous material at least 12%, be preferably at least 14%, especially be at least 16%; Under the situation of annual plant, for drying fibrous material at least 10%, especially at least 12% with especially be at least 19%.
3. method according to claim 1 and 2 is characterized in that, needle timber fibre material is greater than 7km in the breaking length of 12 ° of SR, is preferably more than 7.5km and especially for greater than 8km.
4. according to each described method in the aforementioned claim, it is characterized in that needle timber fibre material is greater than 9km in the breaking length of 15 ° of SR, be preferably more than 9.5km and especially for greater than 10km.
5. according to each described method in the aforementioned claim, it is characterized in that broad-leaved timber fibre material is greater than 6km in the breaking length of 20 ° of SR of beating degree, be preferably more than 7km and especially for greater than 7.5km.
6. according to each described method in the aforementioned claim, it is characterized in that the annual fiber material is greater than 3.5km in the breaking length of 20 ° of SR, be preferably more than 4km and especially for greater than 4.5km.
7. the preparation method of the tissue paper width of cloth (1), the described tissue paper width of cloth (1) is to be prepared by the material suspended liquid that comprises fiber, it is characterized in that, described material suspended liquid contains the ligno-ccllulose fibrous material of being made by timber or annual plant, for fibrous material, have at 15 ° of SR greater than the breaking length of 7.5km with in the lignin content of drying fibrous material at least 13% through the needle timber of bleached state; Perhaps for fibrous material, have at 20 ° of SR greater than the breaking length of 5.0km with in the lignin content of drying fibrous material at least 10% through the broad-leaved timber of bleached state; Perhaps for fibrous material, have at 20 ° of SR greater than the breaking length of 5.5km with in the lignin content of drying fibrous material at least 10% through the annual plant of bleached state.
8. method according to claim 7 is characterized in that, needle timber fibre material is greater than 9km in the breaking length of 15 ° of SR, is preferably more than 10km.
9. according to claim 7 or 8 described methods, it is characterized in that broad-leaved timber fibre material is greater than 5.5 in the breaking length of 20 ° of SR.
10. according to each described method in the claim 7～9, it is characterized in that the annual fiber material is greater than 4km in the breaking length of 20 ° of SR, be preferably more than 4.5km and especially for greater than 5km.
11. prepare the method for the tissue paper width of cloth (1), it is characterized in that described material suspended liquid only contains each described ligno-ccllulose fibrous material in the aforementioned claim.
12. prepare the method for the tissue paper width of cloth (1), it is characterized in that described material suspended liquid is only partly formed by each described ligno-ccllulose fibrous material in the claim 1～11.
13. the described method of claim 12 is characterized in that, the fibrous material of described material suspended liquid 20～80%, preferred 30～50% is formed by each described ligno-ccllulose fibrous material in the claim 1～11.
14. according to each described method in the aforementioned claim, it is characterized in that, during dehydration, the described tissue paper width of cloth (1) is brought between superstructure permeable belt (3) and the bottom permeable belt (2), and pressure is applied on this top band (3), the tissue paper width of cloth (1) and the bottom band (2) along dewatering period.
15. method according to claim 14, wherein, during dehydration (11), gas at first flows through this top band (3), flows through the tissue paper width of cloth (1) then, flows through bottom band (2) then.
16. according to claim 14 or 15 described methods, it is characterized in that, during dehydration, at least in some section, the device that will comprise top band (3), the tissue paper width of cloth (1) and bottom band (2) is brought between the compressive zone (4) and smooth surface that is subjected to tension force, compressive zone (4) acts on the top band (3), and bottom band (2) is carried on the described smooth surface.
17., it is characterized in that in some section at least in dewatering period (11) zone, described gas flows through the device that comprises top band (3), the tissue paper width of cloth (1) and bottom band (2) according to claim 15 or 16 described methods.
18., it is characterized in that the gas stream that flows through the tissue paper width of cloth (1) is 150m going up along dewatering period (11) according to each described method in the claim 15～17
3Per minute and every meter length.
19., it is characterized in that described compressive zone (4) is in 30kN/m at least, preferred 60kN/m at least and especially at least under the tension force of 80kN/m according to each described method in the claim 16～18.
20., it is characterized in that described compressive zone (4) has the contact area of touching area and at least 15% above 50% opening according to each described method in the claim 16～18.
21., it is characterized in that described smooth surface is formed by the circumferential surface of roller (5) according to each described method in the claim 16～20.
22. method according to claim 21 is characterized in that, described air-flow is to form by the negative pressuren zone (10) on the roller (5).
23., it is characterized in that described air-flow is to produce by the malleation cover (6) that is arranged on the top band (3) according to each described method in the claim 15～22.
24. comprise the preparation method of the material suspended liquid of fiber, described suspension is used in particular for the preparation of the tissue paper width of cloth (1), wherein, at least a portion timber or annual plant have for needle timber at least 15% lignin content, for broad-leaved timber at least 12% lignin content and for annual plant at least 10% lignin content, all based on drying fibrous material, described suspension prepares through the following steps under each situation:
-preparation chemical reagent solution, this solution has the chemical reagent greater than 5% (in NaOH) for needle timber, perhaps for broad-leaved timber, has chemical reagent greater than 3.5% (in NaOH), perhaps for annual plant, has chemical reagent greater than 2.5% (in NaOH), under each situation all based on the oven dry amount of timber
-with predetermined bath raio described chemical reagent solution is mixed with timber or annual plant,
-described chemical reagent solution and timber or annual plant are heated to above the temperature of room temperature, then,
-(the 1st scheme) removed free-pouring chemical reagent solution and described timber of vapor phase boiling or annual plant,
-or (the 2nd scheme) boiling timber or annual plant in liquid phase and separates free-pouring chemical reagent solution and timber or annual plant.
25. method according to claim 24 is characterized in that, the lignin content of the fibrous material of preparation, for needle timber at least 15%, be preferably at least 18%, advantageously at least 21%, especially be at least 24%, based on drying fibrous material; For broad-leaved timber, lignin content at least 14%, be preferably at least 16%, be preferably at least 18% especially, based on drying fibrous material; And for annual plant, lignin content at least 10%, be preferably at least 12%, be preferably at least 19% especially, based on drying fibrous material.
26. according to claim 24 or 25 described methods, it is characterized in that, use the quinone composition to prepare described chemical reagent solution.
27. according to each described method of stating in the claim 24～26, it is characterized in that, for boiling needle timber, use maximum 15% chemical reagent, preferred 9%～11% chemical reagent.
28., it is characterized in that, for boiling broad-leaved timber, use maximum 10% chemical reagent, preferred 4～10% chemical reagent, especially 6～9% chemical reagent according to each described method in the claim 24～27.
29. according to each described method in the claim 24～28, it is characterized in that, for the boiling annual plant, use maximum 10% chemical reagent, preferred 3～10% chemical reagent.
30. according to each described method in the claim 24～29, it is characterized in that,, use sulphite and sulfide individually or with the form of mixture in order to prepare chemical reagent solution.
31. method according to claim 30 is characterized in that, in order to prepare chemical reagent solution, has used sour composition and/or alkali composition, has especially used acid, sulfur dioxide, NaOH and/or carbonate.
32., it is characterized in that for the purpose of boiling, used alkali composition and sour composition, described sour composition is SO especially according to each described method in the claim 24～31
2, with alkali composition: SO
2Ratio be set at 5: 1～1.6: 1, be preferably 2: 1.
33. according to each described method in the claim 24～32, it is characterized in that, described method is 6～11 times at pH, be preferably 7～11 times, be preferably 7.5～10 times especially and carry out.
34. according to each described method in the claim 24～33, it is characterized in that timber: the bath raio of chemical reagent solution was made as 1: 1.5～1: 6, was preferably 1: 2～1: 4.
35., it is characterized in that according to each described method in the claim 24～34, described chemical reagent solution and timber or annual plant are heated to maximum 130 ℃, preferably arrive maximum 120 ℃, advantageously arrive maximum 110 ℃.
36. according to each described method in the claim 24～35, it is characterized in that, with described timber or annual plant and the chemical reagent solution when needing heated preferred maximum 60 minutes maximum 120 minutes, advantageously maximum 30 minutes, particularly advantageous was maximum 10 minutes.
37. according to each described method in the claim 24～36, it is characterized in that, under 120 ℃～190 ℃ temperature, preferably under 150 ℃～180 ℃ temperature, particularly preferably in described timber of boiling or annual plant under 160 ℃～170 ℃ the temperature.
38., it is characterized in that the boiling of described timber or annual plant continues maximum 180 minutes according to each described method in the claim 24～37, preferred maximum 90 minutes, preferred maximum 60 minutes especially, advantageously maximum 30 minutes, particularly advantageous was maximum 2 minutes.
39., it is characterized in that digestion time is selected according to bath raio according to the described method of claim 38.
40. according to each described method in the claim 24～39, it is characterized in that, the consumption of chemical reagent is maximum 80% of the chemical reagent that adds when beginning of boiling during the boiling, preferred maximum 60%, preferred especially maximum 40%, advantageously maximum 20%, particularly advantageous is maximum 10%.
41., it is characterized in that, measure the composition of the chemical reagent solution that is removed or separates, and follow its composition that is adjusted to regulation to be reused for the preparation fiber according to each described method in the claim 24～40.
42. according to each described method in the claim 24～41, it is characterized in that, will carry out defiber to lignocellulosic material and the possible chemical reagent solution that discharges after refining is removed, and supply be with further use through boiling.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200610061480 DE102006061480A1 (en) | 2006-12-23 | 2006-12-23 | Producing fibrous material comprises producing a chemical solution, mixing the chemical solution with wood and/or annual plant; heating the chemical solution and pulping and then separating the woods and the chemical solution |
| DE102006061480.1 | 2006-12-23 | ||
| DE102007017061.2 | 2007-04-11 |
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| Publication Number | Publication Date |
|---|---|
| CN101573490A true CN101573490A (en) | 2009-11-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007800479387A Pending CN101573490A (en) | 2006-12-23 | 2007-11-23 | Method for the production of tissue paper |
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| Country | Link |
|---|---|
| CN (1) | CN101573490A (en) |
| DE (1) | DE102006061480A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016011736A1 (en) * | 2014-07-24 | 2016-01-28 | 四川环龙新材料有限公司 | Unbleached paper pulp made from bamboo fiber and preparation method therefor, and raw paper of unbleached daily-use paper made from paper pulp |
| CN107532385A (en) * | 2015-04-29 | 2018-01-02 | Sca卫生用品公司 | Thin paper and its manufacture method comprising the paper pulp fiber from Chinese silvergrass |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009010696A1 (en) * | 2009-02-27 | 2010-09-02 | Voith Patent Gmbh | Method for the production of magazine paper from fiber material suspension, comprises grinding lignocellulosic, bleached, high strength fiber material from wood or annual plants |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH510168A (en) * | 1969-07-30 | 1971-07-15 | Vita Mayer & C Gia | Process for the production of high yield and high degree of whiteness pastes for paper use |
| US4116758A (en) * | 1976-05-14 | 1978-09-26 | Canadian International Paper Co. | Method of producing high yield chemimechanical pulps |
| DE10064131C2 (en) * | 2000-12-22 | 2003-03-27 | Sca Hygiene Prod Gmbh | Fully bleached sulfite pulp, process for its manufacture and products made from it |
-
2006
- 2006-12-23 DE DE200610061480 patent/DE102006061480A1/en not_active Withdrawn
-
2007
- 2007-11-23 CN CNA2007800479387A patent/CN101573490A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016011736A1 (en) * | 2014-07-24 | 2016-01-28 | 四川环龙新材料有限公司 | Unbleached paper pulp made from bamboo fiber and preparation method therefor, and raw paper of unbleached daily-use paper made from paper pulp |
| CN107532385A (en) * | 2015-04-29 | 2018-01-02 | Sca卫生用品公司 | Thin paper and its manufacture method comprising the paper pulp fiber from Chinese silvergrass |
| US10577748B2 (en) | 2015-04-29 | 2020-03-03 | Essity Hygiene And Health Aktiebolag | Tissue paper comprising pulp fibers originating from miscanthus and method for manufacturing the same |
| CN116289325A (en) * | 2015-04-29 | 2023-06-23 | 易希提卫生与保健公司 | Tissue paper comprising pulp fibers derived from miscanthus and method of making same |
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| DE102006061480A1 (en) | 2008-06-26 |
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