An improved corrugator roll for use in an apparatus for making corrugated paperboard wherein the flute tip and a portion flank of the roll base metal are selectively hardened to a predetermined depth by an electro magnetic process. The valleys of the flutes and the remainder of the flank are maintained at the same hardness as the base material.
申请公布号
US4154565(A)
申请公布日期
1979.05.15
申请号
US19780903108
申请日期
1978.05.05
申请人
KOPPERS CO INC
发明人
HYDE, GLENN F;KASINOFF, HARVEY A;MORGRET, GORDON L;PFUNDER, RICHARD R;THOMAS, CHARLES E