Patent ID: 8474739
Filing Date: 2013-07-02
Classification: B02C,D21D

Abstract:
1. A refining surface structure of a refiner for defibrating lignocellulose-containing material comprising: wherein the refining surface structure has a feed edge for receiving a feed flow of the lignocellulose-containing material to be refined and a discharge edge for discharging a refined lignocellulose-containing material, the discharge edge spaced from the feed edge; wherein a first direction is defined toward the discharge edge from the feed edge; wherein a second direction is defined toward the feed edge from the discharge edge; wherein the refining surface structure has at least one first blade bar and at least one second blade bar, the first blade bar and the second blade bar defining a blade groove therebetween, wherein each of the first blade bar and the second blade bar has a side edge abutting the groove, wherein the first blade bar and the second blade bar define a direction of travel; wherein the first blade bar and the second blade bar have first ends directed in the second direction toward the feed edge of the refining surface structure and second ends directed in the first direction toward the discharge edge of the refining surface structure; wherein the refining surface structure further comprises at least one third blade bar having a first end directed in the second direction toward the feed edge of the refining surface structure, and a second end directed in the first direction toward the discharge edge of the refining surface structure, and a first side edge and a second side edge and an upper surface therebetween; wherein the first end of the third blade bar forms a guide surface starting at a first end of said guide surface in the second direction toward the feed edge of the refining surface structure and rising to a second end in the first direction toward the discharge edge of the refining surface structure so as to guide the lignocellulose-containing material to the upper surface of the third blade bar; wherein the third blade bar is at most partly between the first blade bar and the second blade bar such that there is a groove on either side of the third blade bar which is not part of the blade groove defined between the first blade bar and the second blade bar; wherein said guide surface is arranged in the direction of travel of the first blade bar and the second blade bar, and the guide surface is further arranged: at least partly between the first blade bar and the second blade bar, or between the first blade bar and an imaginary extension of the second blade bar; or between an imaginary extension of the first blade bar and the second blade bar; or between the imaginary extensions of both the first blade bar and the second blade bar; and wherein the first side edge and the second side edge of the third blade bar are, at the same time, in contact with either: the side edge of the first blade bar and the side edge of the second blade bar, or the side edge of the first blade bar and an imaginary extension of the side edge of the second blade bar, or an imaginary extension of the side edge of the first blade bar and the side edge of the second blade bar; or the imaginary extensions of both the first blade bar and the second blade bar.