CN111511988A - Fractional extraction of fiber - Google Patents
Fractional extraction of fiber Download PDFInfo
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- CN111511988A CN111511988A CN201880081658.6A CN201880081658A CN111511988A CN 111511988 A CN111511988 A CN 111511988A CN 201880081658 A CN201880081658 A CN 201880081658A CN 111511988 A CN111511988 A CN 111511988A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/30—Multi-ply
- D21H27/38—Multi-ply at least one of the sheets having a fibrous composition differing from that of other sheets
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D99/00—Subject matter not provided for in other groups of this subclass
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
- D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
- D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
- D21H11/04—Kraft or sulfate pulp
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Abstract
There is provided a method of producing a multi-ply paperboard comprising a first ply, a second ply and a third ply, wherein the second ply is arranged between the first ply and the third ply, the method comprising the steps of: a) providing a first and optionally a second lossy pulp; b) mixing the first lossy pulp with a chemical pulp to obtain a first pulp mixture; c) fractionating the first slurry mixture to obtain a reject fraction and an accept fraction; d) mixing the reject fraction with a second spoiled slurry and/or additional slurry to obtain a second slurry mixture; e) forming a second layer from the second slurry mixture; and f) forming a first layer from the slurry including the accept fraction.
Description
Technical Field
The present invention relates to the field of board production in board machines.
Background
Stiffness in the form of bending resistance is an important parameter for many paperboard applications. The prior art describes many methods of increasing stiffness, preferably with minimal increase in fiber consumption, as fiber is a major cost driver in paperboard production. One approach is to produce a paperboard with at least three layers, wherein the outer layers have a relatively high tensile stiffness and the middle layer is bulky and has a relatively low tensile stiffness.
Another paperboard property of interest is surface roughness, particularly of the top surface typically used for printing.
Disclosure of Invention
The object of the present disclosure is to reduce fiber consumption without reducing the bending resistance when producing multi-ply board.
This object has been achieved by the following steps: the broke stock previously used only for the middle layer is mixed with the chemical stock previously used for the bottom layer and the mixture is fractionated to obtain an accept (accept, good) fraction for forming the bottom layer and a reject (reject, end, bad) fraction which is mixed with the non-fractionated broke stock and/or another stock and then used for forming the middle layer.
Accordingly, the present disclosure provides a method of producing a multi-ply paperboard comprising a first ply, a second ply and a third ply, wherein the second ply is disposed between the first ply and the third ply, the method comprising the steps of:
a) providing a first and optionally a second lossy pulp;
b) mixing the first lossy pulp with a chemical pulp to obtain a first pulp mixture;
c) fractionating the first slurry mixture to obtain a reject fraction and an accept fraction;
d) mixing the reject fraction with a second spoiled slurry and/or additional slurry to obtain a second slurry mixture;
e) forming a second layer from the second slurry mixture; and
f) a first layer is formed from a slurry including a accept fraction.
The method of the present disclosure results in a significant increase in the bend resistance index, which allows for a significant reduction in fiber consumption. Further, the method of the present disclosure allows for increased productivity. Moreover, it reduces the roughness of the top surface. This reduction allows less calendering, which in turn further improves the bend resistance index.
Drawings
Fig. 1 shows a conventional (non-inventive) process 100 for producing a three-ply paperboard 110 having a top ply 111, a middle ply 112, and a bottom ply 113. The refined bleached kraft pulp 114 is used to form the top layer 111. The lossy pulp 115 and the low-refined unbleached kraft pulp 116 are mixed in a mixing tank 117. Slurry mixture 118 from mixing tank 117 is used to form intermediate layer 112. A highly refined unbleached kraft slurry 119 is used to form the bottom layer 113.
Figure 2 shows a non-limiting embodiment of the method 200 of the present invention for producing a three ply paperboard 210 having a top ply 211, a middle ply 212, and a bottom ply 213. The refined bleached kraft pulp 214 is used to form the top layer 211. The lossy slurry 215 is divided into a first portion 215a and a second portion 215 b. The first portion 215a is mixed with refined unbleached kraft pulp 219 in a first mixing tank 220 to obtain a first pulp mixture 221. The first slurry mixture 221 is then fractionated in a fractionation device 222 such that a reject fraction 223 and an accept fraction 224 are obtained. The accept fraction 224 is then used to form the bottom layer 213. The reject fraction 223 is mixed with the second portion of the broke stock 215b and the unbleached chemical pulp 216 in a second mixing tank 224 to obtain a second pulp mixture 225. The second slurry mixture 225 is used to form the intermediate layer 212.
FIG. 3 shows the values of the bending resistance index (y-axis (Nm) at 13 different positions (x-axis) in the Cross Direction (CD) of the panel produced in machine test 16/kg3))：
Before the process of the invention (i.e. according to the conventional method);
-a method according to the invention; and
after the process of the invention (i.e. according to the conventional process).
The average bend resistance index prior to the method of the invention was 12.2Nm6/kg313.4Nm in the case of the method of the invention6/kg3And 12.3Nm after the method of the invention6/kg3。
Fig. 4 shows Bendtsen surface roughness values (y-axis (ml/min)) at 13 different positions (x-axis) on the CD of the plate produced in machine test 1:
before the process of the invention (i.e. according to the conventional method);
-a method according to the invention; and
after the process of the invention (i.e. according to the conventional process).
The average Bendtsen surface roughness was 105ml/minn before the process of the invention, 58ml/min in the case of the process of the invention and 95ml/min after the process of the invention.
Fig. 5 shows Bendtsen surface roughness values (y-axis (ml/min)) at 13 different positions (x-axis) on the CD of the plate produced in machine test 2:
before the process of the invention using a pre-calender line load of 20.0kN/m (i.e. according to the traditional process);
-a process according to the invention using a pre-calender line load of 20.0 kN/m;
-a process according to the invention using a pre-calender line load of 15.0 kN/m;
-a process according to the invention using a pre-calender line load of 14.3 kN/m;
-a process according to the invention using a pre-calender line load of 13.0 kN/m;
-a process according to the invention using a pre-calender line load of 12.0 kN/m; and
after the process of the invention using a pre-calender line load of 20.0kN/m (i.e. according to the conventional process).
FIG. 6 shows a machine test2 bending resistance index (y-axis (Nm) at 13 different positions on the CD of the panel produced in 26/kg3))：
Before the process of the invention using a pre-calender line load of 20.0kN/m (i.e. according to the traditional process);
-a process according to the invention using a pre-calender line load of 20.0 kN/m;
-a process according to the invention using a pre-calender line load of 15.0 kN/m;
-a process according to the invention using a pre-calender line load of 14.3 kN/m;
-a process according to the invention using a pre-calender line load of 13.0 kN/m;
-a process according to the invention using a pre-calender line load of 12.0 kN/m; and
after the process of the invention using a pre-calender line load of 20.0kN/m (i.e. according to the conventional process).
FIG. 7 shows the average basis weight (y-axis (g/m) at 13 different locations (x-axis) in the cross direction of the panel produced in machine test 22))：
Before the process of the invention using a pre-calender line load of 20.0kN/m (i.e. according to the traditional process);
-a process according to the invention using a pre-calender line load of 20.0 kN/m;
-a process according to the invention using a pre-calender line load of 15.0 kN/m;
-a process according to the invention using a pre-calender line load of 14.3 kN/m;
-a process according to the invention using a pre-calender line load of 13.0 kN/m;
-a process according to the invention using a pre-calender line load of 12.0 kN/m; and
after the process of the invention using a pre-calender line load of 20.0kN/m (i.e. according to the conventional process).
Detailed Description
The present disclosure relates to a method of producing multi-ply paperboard in a paperboard machine (i.e., a full-size paperboard machine, rather than a pilot machine). The multi-ply paperboard comprises at least three plies. It therefore comprises a first layer, a second layer and a third layer, wherein the second layer is arranged between the first layer and the third layer. The second layer is thus a so-called intermediate layer. The multi-ply paperboard may comprise more than one middle ply, such as two or three middle plies. The third layer is typically a top layer, e.g. for printing, and the first layer is typically a bottom layer.
The method comprises the following steps:
a) a first lossy pulp and optionally a second lossy pulp are provided.
Thus, in an embodiment, step a) comprises providing a first lossy pulp and a second lossy pulp.
The first and second broke stocks may be obtained from different broke stocks. However, they are typically obtained from the same lossy pulp divided into two parts.
The broke stock is typically (and preferably) obtained by the same method as it is used with.
The method further comprises the following steps:
b) the first lossy slurry is mixed with a chemical slurry to obtain a first slurry mixture.
The dry weight ratio of the broke stock to the chemical pulp in the first mixture may for example be between 15:85 and 70:30, preferably between 20:80 and 55: 45. Thus, the proportion of lossy pulp in the first pulp mixture may be 15% to 70%, such as 20% to 55%, by dry weight.
The chemical pulp of step b) is preferably unbleached. However, it may also be bleached. In one embodiment, the chemical slurry of step b) is kraft slurry.
In one embodiment, the proportion of softwood pulp in the chemical pulp of step b) is at least 50%, such as at least 75%, such as at least 90%, by dry weight.
The chemical slurry of step b) is typically refined, although the process of the present disclosure generally requires less refinement than prior art processes. For example, the chemical slurry of step b) may have been subjected to a degree of refining of from 20 to 120kWh/ton, such as from 30 to 100 kWh/ton. For example, the refined chemical pulp of step b) may have a Schopper-Riegler (SR) number, measured according to ISO5267-1:1999, below 20, such as below 17, such as 16 or below. A typical lower limit is 13.
The chemical pulp of step b) may comprise a strength agent such as starch, for example in an amount of 5 to 10kg/ton dry fibre.
Step b) is typically carried out in a mixing tank.
The method further comprises the following steps:
c) the first slurry mixture is fractionated to obtain a reject fraction and an accept fraction.
The dry weight ratio of reject fraction to accept fraction is preferably between 20:80 and 75:25, more preferably between 30:70 and 55: 45.
Fractionation can be carried out, for example, by means of one or more sieves (see, for example, fredlundm et al;) "
karting genomfrakationring ", STFI-rapportTF23, month 8 1996; and
stfiindustrikontkakt, 1995, stage 1, pages 7 to 8).
Preferably by means of a hydrocyclone (see, for example
The doctor's paper "FlowFieldand FibreFractionStudiesHydrocycles" (1996)) was used for fractionation.
It is reported that screens fractionate fibers primarily according to their length, while hydrocyclones fractionate fibers primarily according to their thickness. Thickness-based fractionation is believed to be particularly advantageous for the methods of the present disclosure (i.e., because of the considerations discussed belowThe hydrocyclone was used successfully in machine testing). Thus, the average fiber wall thickness in the reject fraction is preferably greater than the average fiber wall thickness in the accept fraction. The average fiber wall thickness can be determined, for example, by the method of PulpEyeAB (R) ((R))
Sweden) by a commercial colorimetric-based quantification technique (see also US7289210B 2). PulpEye AB has developed a module for fiber wall thickness measurements, called PulpEye Fiber Wall Thickness (FWT) module. A PulpEye FTW block can be obtained to measure the average fiber wall thickness of the sample. Alternatively, the sample may be sent to PulpEyeAB for measurement. The average fiber wall thickness can also be measured by the MorFi wall thickness device that has been developed by CTP and commercialized and distributed by Techpap.
Furthermore, the fines content (%) in the accept fraction is preferably higher than the fines content in the reject fraction. The fines content may be defined as the length-weighted proportion of fibres having a length below 0.2 mm. This ratio can be measured according to tappi 271, for example using the rig kajaaniFS 300. In one embodiment, the level of fines in the accept fraction is at least 50% higher than the level of fines in the reject fraction.
Another way to structurally distinguish between accept and reject fractions is by observing the fraction content. "chips" are defined as fiber bundles having a width of 75 μm or more and a length of 0.3mm or more. The amount of debris is given in units of number of pieces per gram of dry material (#/g). In one embodiment, the fraction content in the reject fraction is at least 100% higher than the fraction content in the accept fraction, such as at least 150% higher. Fragment content can be measured, for example, using PulpEye equipped with a fragment content module.
From the above discussion, it follows that it is preferred to use a hydrocyclone to carry out the fractionation of step c). The reject fraction from the fractionation with a hydrocyclone typically has a consistency in the range of 1.0% to 3.5%. The accept fraction from the fractionation with a hydrocyclone typically has a consistency in the range of 0.1% to 0.4%.
The method further comprises the following steps:
d) the reject fraction is mixed with a second lossy pulp and/or additional pulp to obtain a second pulp mixture.
Thus, in one embodiment, the second slurry mixture is a mixture of reject fraction and a second lossy slurry. Thus, in this embodiment, a second lossy pulp material is provided in step a).
In another embodiment, the second slurry mixture is a mixture of the reject fraction and additional slurry. Thus, for this embodiment, step a) of providing a second lossy pulp material is not required.
In yet another embodiment, the second slurry mixture is a mixture of reject fraction, second spoiled slurry and additional slurry. Thus, in this embodiment, a second lossy pulp material is provided in step a). In this embodiment, the dry weight ratio of the second lossy slurry to the additional slurry may be between 1:4 and 4:1, such as between 1:4 and 1: 1.
The amount of reject fraction added in the mixing of step d) is preferably such that its proportion in the second slurry mixture is from 25% to 70%, such as from 30% to 60%, such as from 40% to 55%, by dry weight.
The additional slurry may be a mechanical slurry, such as a chemical mechanical slurry (CTMP), but it is preferably a chemical slurry. When the additional pulp is a chemical pulp, the additional pulp is preferably provided by the same pulping process as the chemical pulp of step b). However, the chemical slurry added in the mixing of step d) may have undergone less refining than the chemical slurry of step b), or even not undergone refining (because the chemical slurry added in the mixing of step d) will only be used for the second layer/intermediate layer).
In one embodiment, the method includes the step of dividing the chemical slurry into a first portion and a second portion, the first portion becoming the chemical slurry of step b), the second portion becoming the additional slurry added in the mixing of step d). As can be derived from the above discussion, in this embodiment the first portion is preferably subjected to more refining than the second portion (typically measured in kWh/ton). Thus, preferably, for the first portion, the Schopper-Riegler (SR) number (measured according to ISO5267-1: 1999) is higher than for the second portion.
The second slurry mixture may include a strength agent such as starch, for example in an amount of 5kg/ton to 10kg/ton of dry fibre.
Step d) is typically carried out in a mixing tank.
The method further comprises the following steps:
e) forming a second layer from the second slurry mixture; and
f) a first layer is formed from a slurry including a accept fraction.
In a preferred embodiment, the first layer is formed from the accept fraction in step f). According to this preferred embodiment, the accept fraction is not mixed with any other slurry prior to forming the first layer.
The method may further comprise the step of forming the third layer from a slurry comprising a chemical slurry, such as a bleached chemical slurry, such as bleached kraft slurry. In one embodiment, the pulp used to form the third layer is a mixture of hardwood pulp and softwood pulp. The slurry used to form the third layer is preferably refined, for example such that it has a higher Schopper-riegler (sr) number (measured according to ISO5267-1: 1999) than the chemical slurry of step b).
The slurry used to form the third layer may include a strength agent such as starch, for example in an amount of 5kg/ton to 10kg/ton of dry fibre.
The formation of a paperboard layer from a stock in a paperboard machine is well known to those skilled in the art and will therefore not be described in detail here.
The method may further comprise the steps of: the multilayer paperboard is coated by applying a coating composition, such as a pigment coating composition, onto the third layer, for example to further improve printing properties.
The grammage of the multi-ply board produced by the method, measured according to ISO536, is typically 150g/m2To 500g/m2Such as at 160g/m2To 450g/m2Such as at 170g/m2To 350g/m2In the meantime. When measuring grammage, no coating is included.
Examples
In machine test 1, the process of the present invention for producing a three-ply board was compared with the conventional process for producing a three-ply board.
In conventional methods, a high-refined bleached kraft pulp is used to form the top layer, a high-refined unbleached kraft pulp is used to form the bottom layer, and a blend of broke pulp and low-refined unbleached kraft pulp is used to form the middle layer. This is shown in fig. 1.
In the method of the invention (falling into the embodiment of fig. 2), the highly refined bleached kraft pulp is again used to form the top layer. In contrast to conventional methods, a first portion of the pulped material is used for the bottom layer. In detail, a (first) mixture of broke pulp slurry (30%) and refined unbleached kraft slurry (70%) was prepared and subsequently subjected to fractionation in a hydrocyclone. The degree of refining of the refined unbleached pulp is lower than that of the highly refined unbleached pulp in the conventional method. The accept fraction from the fractionation is then used to form the bottom layer. To form the second slurry mixture for forming the middle layer, reject fraction from the fractionation is added to the mixing tank. Further, a second portion of the broke slurry and the low refined unbleached kraft slurry were mixed in a ratio of 1: a dry weight ratio of 2 was added to the mixing tank. The proportion of reject fraction in the second mixture was 50%.
The bending resistance index of the boards produced by the conventional method and the method of the present invention was measured (see fig. 3). It is shown that the method of the invention increases the bend resistance index by about 9.4%. Such an increase allows a basis weight reduction of about 2% (and thus a fiber consumption reduction of about 2%). Furthermore, the reduced basis weight allows for reduced steam consumption in the dryer section.
In addition, the roughness of the top surface of the plate produced by the conventional method and the method of the present invention was measured (see fig. 4). It is shown that the method of the present invention reduced the top surface roughness by about 42%. This is very surprising, since the slurry used for the top layer is the same in both the conventional process and the process of the invention.
In machine test 2, the conventional method for producing three-ply board according to machine test 1 was compared with the method of the invention for producing three-ply board ("test 2 of the invention").
In test 2 of the present invention, the amount of starch (strength agent) in the intermediate layer was 8.5kg/ton, compared to 6.8kg/ton in the conventional method. Furthermore, for inventive trial 2, the amount of starch (strength agent) in the top layer was 8.0kg/ton compared to 6.0kg/ton for the conventional method. The reason for increasing the amount of starch is to maintain the z-direction strength when the composition of the middle layer is changed.
As in machine test 1, bleached kraft pulp in the conventional process was used to form the top layer, high-refined unbleached kraft pulp was used to form the bottom layer, and a mixture of broke pulp and low-refined unbleached kraft pulp was used to form the middle layer. This is shown in fig. 1. The bottom layer of highly refined unbleached pulp was refined to a degree of 166 kWh/ton.
In test 2 of the present invention (falling into the embodiment of fig. 2), bleached kraft pulp was again used to form the top layer. In contrast to conventional methods, a first portion of the pulped material is used for the bottom layer. In detail, a (first) mixture of broke pulp slurry (30%) and refined unbleached kraft slurry (70%) was prepared and then subjected to fractionation in a hydrocyclone. The degree of refining of the refined unbleached pulp was 80kWh/ton, i.e. 52% lower than the highly refined unbleached pulp in the conventional process. Reduced refining reduces energy consumption and promotes dewatering. The accept fraction from the fractionation is then used to form the bottom layer. To form the second slurry mixture for forming the middle layer, reject fraction from the fractionation is added to the mixing tank. Further, a second portion of the broke slurry and the low refined unbleached kraft slurry were mixed in a ratio of 1: a ratio of 2 was added to the mixing tank. Even though the degree of refining of the unbleached kraft pulp for the bottom layer is reduced, it is still higher than that of the unbleached kraft pulp exclusively for the middle layer (i.e., low-refined unbleached kraft pulp).
Characterization of injectables, accepted fractions and rejected fractions
A mixture of the lossy slurry and the chemical slurry (i.e., a "first slurry mixture" according to the present disclosure, hereinafter referred to as an "injectate") is fractionated into an accept fraction and a reject fraction using a hydrocyclone.
Two samples were taken from each of the injectate, accept fraction, and reject fraction. Samples were sent to PulpEye for characterization. The results are presented in table 1 below.
TABLE 1 characterization of the samples. The "fine powder" has a length of 0.2mm or less. "chips" are defined as fiber bundles having a width of 75 μm or more and a length of 0.3mm or more. The amount of debris is given in units of number of pieces per gram of dry material (#/g).
Claims (15)
1. A method of producing a multi-ply paperboard comprising a first ply, a second ply and a third ply, wherein the second ply is disposed between the first ply and the third ply, the method comprising the steps of:
a) providing a first and optionally a second lossy pulp;
b) mixing the first lossy slurry with a chemical slurry to obtain a first slurry mixture;
c) fractionating the first slurry mixture to obtain a reject fraction and an accept fraction;
d) mixing the reject fraction with the second spoiled slurry and/or additional slurry to obtain a second slurry mixture;
e) forming the second layer from the second slurry mixture; and
f) forming the first layer from a slurry comprising the accept fraction.
2. The method according to claim 1, wherein step a) comprises dividing the broke stock into a first part and a second part, the first part being the first broke stock and the second part being the second broke stock.
3. The method according to any of the preceding claims, wherein the chemical pulp of step b) is unbleached.
4. The method according to any of the preceding claims, wherein the chemical pulp of step b) is a kraft pulp.
5. The method according to any of the preceding claims, wherein the additional pulp is provided by the same pulping process as the chemical pulp of step b).
6. The method of claim 5, further comprising the steps of: dividing the chemical slurry into a first portion that becomes the chemical slurry of step d) and a second portion that becomes the additional slurry added in the mixing of step d).
7. The method according to claim 6, wherein at least the first portion is refined such that the Schopper-Riegler (SR) measured according to ISA5267-1:1999 for the chemical pulp of step b) is higher than that measured for the additional pulp added in the mixing of step d).
8. The method according to any of the preceding claims, wherein the chemical pulp of step b) has a Schopper-riegler (sr) number measured according to ISA5267-1:1999 of below 20, such as between 13 and 17.
9. The method according to any one of the preceding claims, wherein the dry weight ratio of the rejected fraction to the accepted fraction is between 20:80 and 75:25, such as between 30:70 and 55: 45.
10. The method according to any one of the preceding claims, wherein the fractionation of step c) comprises performing fractionation in a hydrocyclone.
11. The method according to any one of the preceding claims, wherein the proportion of reject fraction in the second slurry mixture is 25% to 70%, such as 30% to 60%, such as 40% to 55%, by dry weight.
12. A method according to any of the preceding claims, wherein the third layer is formed from a slurry, the slurry forming the third layer comprising a chemical slurry, such as a bleached chemical slurry.
13. The method according to any of the preceding claims, wherein the third layer is a top layer for printing and the first layer is a bottom layer.
14. The method of claim 13, further comprising the steps of: the multilayer paperboard is coated by applying a coating composition, such as a pigment coating composition, onto the top layer.
15. The method according to any one of the preceding claims,wherein the grammage of the multi-ply board measured according to ISO536 is 150g/m2To 500g/m2Such as at 160g/m2To 450g/m2Such as at 170g/m2To 350g/m2In the meantime.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP17209806.3A EP3502348B1 (en) | 2017-12-21 | 2017-12-21 | Fibre fractionation |
| EP17209806.3 | 2017-12-21 | ||
| PCT/EP2018/085408 WO2019121625A1 (en) | 2017-12-21 | 2018-12-18 | Fibre fractionation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111511988A true CN111511988A (en) | 2020-08-07 |
| CN111511988B CN111511988B (en) | 2022-09-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880081658.6A Active CN111511988B (en) | 2017-12-21 | 2018-12-18 | Fractional extraction of fiber |
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| Country | Link |
|---|---|
| EP (1) | EP3502348B1 (en) |
| CN (1) | CN111511988B (en) |
| WO (1) | WO2019121625A1 (en) |
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| AT524998B1 (en) * | 2021-04-21 | 2023-02-15 | Mondi Ag | Printable multi-ply paper for packaging and method of making same |
| EP4389972A1 (en) * | 2022-12-21 | 2024-06-26 | Billerud Aktiebolag (publ) | Multilayer paperboard |
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| BRPI0417255B1 (en) | 2003-12-03 | 2018-02-14 | Fpinnovations | APPARATUS FOR DETERMINING RELATED PHASE LEADS AND GUIDELINES OF DIFFERENT LAYERS IN A BIRREFRINGENT CELLULAR FIBER SPECIMEN, AND METHOD FOR DETERMINING FIBER RELATED FIBRARY LEADING INTACTA |
| WO2008153565A1 (en) * | 2007-06-12 | 2008-12-18 | Meadwestvaco Corporation | A fiber blend having high yield and enhanced pulp performance and method for making same |
| US20080308239A1 (en) * | 2007-06-12 | 2008-12-18 | Hart Peter W | Fiber blend having high yield and enhanced pulp performance and method for making same |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2019121625A1 (en) | 2019-06-27 |
| EP3502348A1 (en) | 2019-06-26 |
| CN111511988B (en) | 2022-09-27 |
| EP3502348B1 (en) | 2020-06-24 |
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