ROTOLUX: specialist in gift wrapping
Rotolux has installations for helio (gravure), flexo and foil printing. These techniques are rarely mentioned in Belgian printing schools. Nevertheless a lot of products are printed with these printing methods, for instance wrapping paper, food packaging, medical packaging, flower sleeves, garbage bags, carrier bags, labels, etc..
In gravure printing, the image is engraved onto a copper cylinder. While the press is in operation, the engraved cylinder is immersed in the ink fountain, filling the recessed cells with ink. A blade scrapes the cylinder, removing excess ink from the non-printing (non-recessed) areas and leaving in the cells the right amount of ink required. Then the paper is pressed onto the gravure cylinder so the ink is transferred to the paper. Heliogravure printing produces sharp and clean images. We can print effortlessly even with gold and silver ink.
In flexography the image areas are raised above the non-image areas on the rubber plate (opposite of helio). Flexographic printing uses the same principle as stamping, only on a larger scale. Flexography is not suitable for very detailed images because it is very difficult to get a sharp look. The flexo method is commonly used for packaging materials.
Besides these printing presses, Rotolux has its own ink mixing station. This computer-controlled machine pumps exact quantities of specific inkt into the base ink. Once we obtained the correct formula for the required colour, we can mix this colour endlessly.
After the printing process the paper must be winded onto manageable rolls. We have several rolling machines. The paper on these mother rolls (weight: 1 000 kg) is then again winded onto rolls, so shop keepers can handle them.