Peripherally grooved guide roller for paper or carton web

摘要

The grooves (3) are closed in at right angles to the rotation axis of the roller (4) and arranged so the casing surface is increased by at least the degree of web enlargement so the angle between the tangent to one groove flank and a line parallel to the roller axis is at most 90 deg . In this way, the outer surface of the roller casing is increased by 1.03-1.08 times or maximum 1.15 times the cylindrical roller shell surface, allowing 3 to 10 grooves per meter axial roller length. The diameter of the roller amounts to 150 to 500 mm in the raised parts of roller, and the outer boundary line of the roller for preference is sinusoidal. The grooves should run mirror-symmetrically to the plane (5) which passes through the centre of the roller at right angles so that the outer flank of the groove is steeper than the inner flank in a roller which here is preferably used for guiding moist paper or carton material as it feeds into the drier.