Production method
AssigneeBillerudkorsnas AB
InventorJohan Magnusson
Life of this patent
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Abstract
There is provided a method of producing a highly refined pulp, comprising the steps of: providing a pulp; subjecting the pulp to a first conical refining step in at least one conical refiner comprising refining plates having a bar width of 0.5-1.5 mm, such as about 1.0 mm, and a groove width of 1.0-2.0 mm, such as 1.4-2.0 mm, such as about 1.6 mm; and subjecting the pulp from the first conical refining step to a second conical refining step in at least one conical refiner comprising refining plates having a bar width of 0.5-1.5 mm, such as about 1.0 mm, and a groove width of 0.8-1.6 mm, such as 1.0-1.5 mm, to obtain the highly refined pulp.
Claims27
A method of producing a refined pulp, comprising the steps of:
- providing a pulp;
- subjecting the pulp to a first conical refining step in at least one conical refiner comprising refining plates having a bar width of 0.5-1.5 mm, and a groove width of 1.0-2.0 mm;
- and
- subjecting the pulp from the first conical refining step to a second conical refining step in at least one conical refiner comprising refining plates having a bar width of 0.5-1.5 mm, and a groove width of 0.8-1.6 mm, to obtain the refined pulp;
- wherein:
- the groove width is greater than the bar width in the first conical refining step,
- the groove width of the second conical refining step is smaller than the groove width of
- the first conical refining step,
- the pulp is bleached hardwood pulp, and
- the consistency of the pulp in the first and the second conical refining step is 2-5%.
A method of producing a highly refined pulp, comprising the steps of:
- providing a pulp;
- subjecting the pulp to a first conical refining step in a conical refiner comprising refining plates having a bar width of 0.5-1.5 mm, and a groove width of 0.5-1.5 mm;
- and
- subjecting the pulp from the first conical refining step to a second conical refining step in at least one conical refiner comprising refining plates having a bar width of 0.5-1.0 mm, and a groove width of 0.5-1.0 mm, to obtain the highly refined pulp;
- and
- wherein:
- the groove width is greater than the bar width in the first conical refining step,
- the groove width of the second conical refining step is smaller than the groove width of the first conical refining step,
- the pulp is bleached hardwood pulp, and
- the consistency of the pulp in the first and the second conical refining step is 2-5%.
A system for producing a refined pulp, comprising:
- a first refining arrangement comprising at least one conical refiner comprising refining plates having a bar width of 0.5-1.5 mm, and a groove width of 1.0-2.0 mm, wherein the groove width is preferably greater than the bar width;
- and
- a second refining arrangement comprising at least one conical refiner comprising refining plates having a bar width of 0.5-1.5 mm, and a groove width of 0.8-1.6 mm,
- wherein the second refining arrangement is connected to and arranged downstream of the first refining arrangement;
- wherein the groove width is greater than the bar width in the first refining arrangement, and the groove width of the second refining arrangement is smaller than the groove width of the first refining arrangement.
A system for producing a refined pulp, comprising:
- a first refining arrangement comprising a conical refiner comprising refining plates having a bar width of 0.5-1.5 mm, and a groove width of 0.5-1.5 mm;
- and
- a second refining arrangement comprising at least one conical refiner comprising refining plates having a bar width of 0.5-1.0 mm, and a groove width of 0.5-1.0 mm,
- wherein the second refining arrangement is connected to and arranged downstream of the first refining arrangement;
- and
- wherein the groove width is greater than the bar width in the first refining arrangement, and the groove width of the second refining arrangement is smaller than the groove width of the first refining arrangement.
Dependencies are inferred from the claim text.