Refiner disc segment
AssigneeSCA Development Aktiebolag
InventorsPer V. Peterson, Hans E. Hoglund, Alf O. K. Johansson
Life of this patent
Estimating the term…
Abstract
Refiner disc segments for use in connection with disc refiners are disclosed. The refiner disc segments include in a radial portion thereof raised bars extending outwardly from the center of the segment with grooves defined between the raised bars, the raised bars having a width B, and the grooves having a width S and a depth D such that the ratio B.multidot.S.multidot.D/S+D is greater than about 2.7 mm and less than about 4.3 mm, and wherein the width B is from about 1 to 4 mm, the width S is from about 2 to 5 mm, and the depth D is from about 1 to 7 mm. Overall refining apparatus including a pair of refining members which includes such refining disc segments are also disclosed as is a method for producing these refining disc segments.
Claims12
An apparatus for refining fibrous material containing cellulose, said apparatus comprising a pair of refining members that are relatively rotatable about a common axis, each refining member having a refining surface that is opposed to the refining surface of the other refining member, each refining surface including an inner end that corresponds to said common axis, and an outer end, wherein said refining surfaces define a zone therebetween that extends radially outwardly relative to said common axis so that fibrous material passes through said zone;
- and further wherein at least one of said refining surfaces in a predetermined radial portion of said refining surfaces comprises a plurality of raised bars that extend radially outwardly with a plurality of grooves defined between said plurality of raised bars, each of said plurality of raised bars being of a predetermined width B, and each of said plurality of grooves being of a predetermined width S and a predetermined depth D in said predetermined radial portion, such that B.multidot.S.multidot.D/S+D is greater than 2.7 mm.sup.2 and less than 4.3 mm.sup.2, wherein said predetermined width B is between about 1.0 mm and about 4.0 mm, said predetermined width S is between about 2.0 mm and about 5.0 mm, and said predetermined depth D is between about 1.0 mm and about 7.0 mm.
A refiner disc segment for a disc refiner rotatable about a central axis for refining fibrous material containing cellulose, said refiner disc segment including an inner portion corresponding to said central axis, a portion extending radially therefrom, and an outer end, and including in a predetermined radial portion thereof a plurality of raised bars that extend radially outwardly with a plurality of grooves defined between said plurality of raised bars, each of said plurality of raised bars being of a predetermined width B, and each of said plurality of grooves being of a predetermined width S and a predetermined depth D in said predetermined radial portion, such that B.multidot.S.multidot.D/S+D is greater than about 2.7 mm.sup.2 and less than about 4.3 mm.sup.2, wherein said predetermined width B is between about 1 mm and about 4 mm, said predetermined width S is between about 2 mm and about 5 mm, and said predetermined depth D is between about 1 mm and about 7 mm.
Dependencies are inferred from the claim text.