US 5,626,709 A · Single facer corrugating roll flute contour

Abstract

A single facer has corrugating rolls of which the cross-sectional tip and root curves are elliptical (as broadly defined) to form a medium compression zone 38 beyond which, on each side of the tip center line, the root extends to define a clearance gap greater than the thickness of the medium; the root curve may (FIGS. 2 and 3) continue as an ellipse which also defines the flute flank, or alternatively the flute flank may be defined by a straight line 76 (FIG. 4) with a transition curve 58 between the straight line and the root curve 52. According to a different aspect of this invention, flank clearance is provided by the use of differently shaped flutes on the two corrugating rolls; for example (FIG. 5) the second roll 71 which carries the medium after corrugating may have straight flanks 76, and the other roll may have concave flanks 78.

Claims11

Dependent claims

A single facer corrugating machine, the improvement comprising two cooperating fluted corrugating rolls of which the flute tip and root curves have a relatively large radius at the center line and a reduced radius on each side of the center line leading to the flanks between the tip and root curves, the tip and root curves differing so that, when their center lines are aligned, they define a gap of approximately uniform thickness extending for a predetermined distance in both directions from the center line, the root contour extending beyond that predetermined distance, on each side of the center line, as a curve which extends to a flank contour spaced from the opposed flank of the cooperating flute by a distance greater than the thickness of the gap along substantially the entire length of the flank, the flank contours on at least one of the corrugating rolls being concave.

Dependencies are inferred from the claim text.

Single facer corrugating roll flute contour

Life of this patent

Single facer corrugating roll flute contour

Life of this patent

Abstract

Claims11