Non-Esa rotogravure printing

Electrostatic assist is used in rotogravure printing to prevent missing dots and ensure higher-quality images with high ink and color density. To guarantee the best and homogenous printing results ever seen, Hannecard developed the unique solutions HanneResist & HanneVision where carbon nano particles are added to its elastomer coatings. Thanks to this unique combination a more homogeneous electric field is generated, offering more accurate attraction of ink on the printed medium and resulting in a superior printing quality. This new technology also better controls the electric charge submitted to the roller, thus lowering the risks for over-charging and sparks. Our HanneResist & HanneVision covering solutions are suited for the decor & cardboard packaging (especially cigarette packaging) printing industry and complies with all electrostatic assist systems (top loading, direct charge (core charging) and side loading)

Electrostatic assist cannot be used for metallic inks due to the risk of short circuits or sparks. To enable dissipation of static electricity, we offer antistatic coatings. The PressoGraf range for classical rotogravure presses comes in the following variants, each with their own specific qualities. All versions are by default antistatic and so reduce fire risk as a result of sparkover. The impression roll coverings or sleeves are available for the applications of decorative printing, cardboard printing and flexible packaging.

In the domain of adhesive film and paper production, several techniques can be applied for primer and finish coating. Hannecard supplies rubber, as well as polyurethane roller coverings suited for both water and solvent-based coatings. Depending on the process, the pick-up, transfer or back-up roll can be elastomer coated. All qualities mentioned below are also available in antistatic versions.

To assure non-stick, non-crushing and non-marking for fine media (low density paper, thin film and flexible packaging) and ‘correcting’ characteristics for the contacting web, Hannecard has developed MicroGraf, a micro-cellular foam rubber for the covering of the paster rollers for the splices. MicroGraf is soft and assures the desired constant elasticity. This quality allows for planar corrections and the elimination of air pockets in the spliced web reels. As a variant, we can extend the MicroGraf paster roller covering in a double layered version called MicroGraf+. In this case, the top layer is a compact harder rubber, which can be finished helicoidally or with other special types of grooves, according to the web medium. For rougher media like Kraft paper you can rely on our low-hardness polyurethane series Splice-O-Graf, that comes in hardnesses of 22 or 30 Shore A, and which combines a high elasticity with increased mechanical and dynamical properties.