Down to the finest detail
Finishing Laser punching is still little known. It can be used to create intricate motifs that cannot be realized with conventional tools.
Finishing Laser punching is still little known. It can be used to create intricate motifs that cannot be realized with conventional tools.
The eye also buys. This applies to product packaging as well as printed matter. Finishing can be used to achieve a wide variety of effects that increase the attractiveness of the product and give it a high-quality appearance. Die-cutting plays a particularly important role in printed matter when, for example, special shapes are to be implemented in cardboard or paper. Windows or cut-outs can also be used to enhance the visual and tactile effect. If the finest punched parts or intricate patterns are required, conventional punching tools quickly reach their limits. These tasks can be optimally solved with laser punching, also known as filigree laser punching. The process is suitable for reproducing company or brand logos, intricate graphics, the finest ornaments and even raster images in a tactile manner. Such fine die-cut parts can be used, for example, as design elements for the cover of advertising brochures and annual reports, for decorative packaging or even for exclusive labels.
For the finest punching "There has long been a market for filigree laser technology. The process is by no means new," says Hubert Gantschnigg, Managing Director of Bern-based Indivisuell GmbH. However, unlike in Germany, Scandinavia and France, the possibilities of filigree laser technology are not sufficiently exploited here in Switzerland. This may also be due to the fact that the technology is not well known and the investments are high. Indivisuell is the Swiss sales partner of the Neuss-based printing company Schroeder GmbH, which carries out orders in the field of filigree laser technology. "We work with two fundamentally different laser punching processes and can therefore offer our customers the broadest range of services in this area," says Gantschnigg.
The digital laser makes it possible to virtually cut out a laser motif along the contour according to the transmitted vector data. Due to its digital flexibility, this process is particularly suitable for individual samples, short runs or personalization. "Especially for short runs of 100 to 200 pieces, the costs for the cutting dies that are incurred with the conventional cutting process are not worthwhile," explains Gantschnigg. The P4 permanent high-power laser (4000 W) is the world's fastest laser punching system, which "burns away" the desired subject areas over the entire surface. A 0.3 mm thick copper template is created using the data supplied or an offset film. This stencil is passed under the permanent laser beam together with the paper. Wherever the laser beam can penetrate the stencil, the material underneath is completely burned away. Finenesses of approx. 0.3 to 0.5 mm are thus possible. This depends on the material and subject. "We use this process to achieve the finest and most accurate die-cuts in both small and large print runs," says Gantschnigg. The maximum motif size for the digital laser is 400 x 400 mm, or 140 x 700 mm for the permanent high-power laser in one pass.
Paper selection and motifsAny paper and cardboard up to a weight of approx. 500 g/m2 can be used for laser die-cutting. Uncoated and uncoated papers are more suitable than those coated with chalk, kaolin or other materials. When creating a laser subject, it should be noted that all closed shapes that should not fall out must be held in place by small bars. This must of course also be taken into account for letters such as A, D, O. Lasering also produces a brown edge of varying fineness on the back (burning side) of the laser edges, which can be very easily reduced or made almost invisible by using printed color areas or colored paper.
For further processing such as folding, creasing, gluing or binding, Gantschnigg recommends selecting the appropriate paper thickness. It is particularly important to bear in mind that the stability of the paper is affected by the size or fineness of the motif. The position of the laser subject in relation to a folded edge or crease must also be taken into account. If it is too close to a folded edge, this can lead to problems when folding or the laser motif can be damaged. The runnability of letterheads, e.g. in laser printers or fax machines, must also be taken into account.
Comprehensive adviceThe cost of finishing printed matter with the filigree laser depends on various factors. "Paper type and grammage, sheet format, print size, laser sujet size, number of copies, print run and further processing all have an influence," says Gantschnigg. "We offer comprehensive advice that includes not only the process itself, the motifs to be realized and the costs, but also the choice of paper, for example." Information at www.filigranlaser.ch and alsowww.filigran-laser.de
Sabine Flaxman
