Patent ID: 6679387
Filing Date: 2004-01-20
Classification: B27N

Abstract:
A roll set for handling, particularly screening and spreading, of wood chips or shavings, said roll set comprising:at least two parallel-mounted, rotatable rolls; interroll gaps separating the rolls for passing material being handled; a surface patterning provided on at least a number of the rolls, wherein at least some of the rolls of the roll set have at least one collar ring made thereto in an annular manner essentially about the entire circumference of the roll, whereby the collar ring has an outer diameter advantageously at least as large as an outer diameter of the surface patterning made on the roll, the at least one collar ring being located essentially on a middle area of an axial length of the roll so that the collar rings of two adjacent ones of the rolls are aligned in a substantially identical location along the axial lengths of the rolls, whereby the collar rings on the adjacent rolls make a physical contact with each other during an anomalous operating situation.