Cylinder body for orienting magnetic flakes contained in an ink or varnish vehicle applied on a sheet-like or web-like substrate

摘要

There is described a cylinder body (10) for orienting magnetic flakes contained in an ink or varnish vehicle applied on a sheet-like or web-like substrate, which cylinder body (10) has a plurality of magnetic-field-generating devices (50, 60) disposed on an outer circumference of the cylinder body (10). The cylinder body (10) comprises a plurality of distinct annular supporting rings (40) distributed axially along a common shaft member (20), each annular supporting ring (40) carrying a set of magnetic-field-generating devices (50, 60) which are distributed circumferentially on an outer circumference of the annular supporting rings (40).

主权项

1. A cylinder body for orienting magnetic flakes contained in an ink or varnish vehicle applied on a sheet-like or web-like substrate, which cylinder body has a plurality of magnetic-field-generating devices disposed on an outer circumference of the cylinder body, wherein the cylinder body further comprises a plurality of distinct annular supporting rings distributed axially along a common shaft member, each annular supporting ring carrying a set of the magnetic-field-generating devices which are distributed circumferentially on an outer circumference of the annular supporting rings, wherein the cylinder body further comprises a cover plate made of a material having a low magnetic permeability, which cover plate is secured on the annular supporting rings and covers the magnetic-field-generating devices, wherein the cover plate is provided with openings at locations corresponding to the positions of the magnetic-field-generating devices.