Solid material comminution or disintegration – Apparatus – Cooperating comminuting surfaces
Patent
1996-12-12
1998-01-06
Husar, John M.
Solid material comminution or disintegration
Apparatus
Cooperating comminuting surfaces
241296, 241297, B02C 712
Patent
active
057045593
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to working and dispersing lignocellulosic fiber material, preferably wood pulp containing recycled fiber, during the refining thereof. More particularly, the present invention relates to refining elements for use in disk refiners, intended for said refining.
BACKGROUND OF THE INVENTION
Known disk refiners generally comprise two opposed refining disks, which are rotary relative to each other and on at least one of which a plurality of refining elements are arranged. These refining elements are formed with a pattern of bars and intermediate grooves. The refining disks are arranged so that a refining gap is formed between the refining elements, through which the fiber material is intended to pass in an outward direction therebetween. In this manner, the dispersing and refining functions are carried out by the bars of the refining elements.
In the inner portion of the refining gap the refining elements are generally formed with coarse bars to initiate the disintegration of the fibrous material and to feed it outwardly to the outer portion of the refining gap, where working of the fibrous material takes place.
For the dispersing type of refining, the type of refiner is normally used which comprises one stationary refining disk and one opposed rotary refining disk. This type of treatment, which is carried out on preheated fiber material, which is generally present in high concentrations, has the object of utilizing lenient working to provide a pulp of improved quality. The purpose of dispersing normally is to utilize mechanical treatment to unbind from the fibers in the pulp impurities, generally in the form of printing ink and so-called hot-melts (plastic and glue particles), and to disintegrate these impurities to a sub-visible size without negatively affecting the fibers. The freeness (CSF) of the pulp therefore must not be appreciably reduced.
With conventional refining elements, which employ substantially radial bars in the refiner, capacity problems can arise when an effective working of the fiber material is to be obtained. On the other hand, quality problems can arise when the capacity is increased. Furthermore, the freeness of the pulp is reduced. Also, while the tensile strength can certainly be improved thereby, the disintegration of impurities, or the so-called speck reduction, will then be relatively poor.
By designing the refining elements with toothed working surfaces instead of radial bars, a lenient working with good speck reduction is obtained. The freeness of the pulp is not reduced appreciably, and the strength properties of the pulp are affected only insignificantly.
SUMMARY OF THE INVENTION
In accordance with the present invention, these and other objects have now been realized by the invention of apparatus for refining lignocellulose-containing material which comprises a first stationary refining disk having a first refining surface and a second rotatable refining disk having a second refining surface, the first and second refining disks being mounted with the first and second refining surfaces facing each other in opposed relationship thereby defining a refining gap therebetween, the first refining surface including a plurality of radially extending first bars separated by a plurality of grooves and the second refining surface including a plurality of radially extending second bars separated by a plurality of grooves, the plurality of radially extending first bars including a plurality of first raised portions alternating radially with a plurality of first depressed portions, the plurality of radially extending second bars including a plurality of second raised portions alternating radially with a plurality of second depressed portions, the plurality of first raised portions being located opposite the plurality of second depressed portions, and the plurality of second raised portions being located opposite the plurality of first depressed portions, the plurality of first raised portions having a first predetermined length and the
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Froberg Per
Kankaanpaa Veikko
Makivaara Juha
Husar John M.
Sunds Defibrator Industries AB
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