Abstract: An impression roller for gravure printing for use with an electrostatic printing aid, including an axis member or a shaft, joined axially to a steel core, an electrical inner insulating layer extending radially around the core, an electrically semi-conductive outer layer adjoining the outside of the impression layer, and an electrically highly conductive conductor layer arranged between the two. The conductor layer is encapsulated in an electrically insulated exterior. The impression roller is provided with an electric or electronic encapsulated circuit electrically insulated from the outside and having two poles, which is of low resistance in normal operation when the electric current flows from its positive pole to its negative pole and is of high resistance when the flow direction is opposite. The inner pole and outer pole of the circuit are connected to the conductor layer by an inner and outer connection of the impression roller respectively.

Abstract: An impression roller for gravure printing for use with an electrostatic printing aid, including an axis member or a shaft, joined axially to a steel core, an electrical inner insulating layer extending radially around the core, an electrically semi-conductive outer layer adjoining the outside of the impression layer, and an electrically highly conductive conductor layer arranged between the two. The conductor layer is encapsulated in an electrically insulated exterior. The impression roller is provided with an electric or electronic encapsulated circuit electrically insulated from the outside and having two poles, which is of low resistance in normal operation when the electric current flows from its positive pole to its negative pole and is of high resistance when the flow direction is opposite. The inner pole and outer pole of the circuit are connected to the conductor layer by an inner and outer connection of the impression roller respectively.

Abstract: The invention relates to apparatus replacing atmospheric oxygen with an inert gas such as N2 from the minimum of one laminar air boundary layer of substrates moving in the direction of advance, for instance fast moving lines of material fitted with a first chamber which is only open toward the said substrate and otherwise is sealed off by the surrounding outer space, said first chamber comprising in the zone of its front sealing edge, transversely to the direction of advance, a front corona electrode fed with high DC voltage and associated with a front mate electrode on the other substrate side, and a further corona electrode on the same substrate side mounted on a further sealing edge transverse to the direction of advance, said further corona electrode being fed with high DC voltage and being associated with a further mate electrode on the other substrate side, and including a device feeding the said inert gas.

Abstract: The invention relates to apparatus replacing atmospheric oxygen with an inert gas such as N2 from the minimum of one laminar air boundary layer of substrates moving in the direction of advance, for instance fast moving lines of material fitted with a first chamber which is only open toward the said substrate and otherwise is sealed off by the surrounding outer space, said first chamber comprising in the zone of its front sealing edge, transversely to the direction of advance, a front corona electrode fed with high DC voltage and associated with a front mate electrode on the other substrate side, and a further corona electrode on the same substrate side mounted on a further sealing edge transverse to the direction of advance, said further corona electrode being fed with high DC voltage and being associated with a further mate electrode on the other substrate side, and including a device feeding the said inert gas.