Tissue printing shrinkage approach

In order to improve production efficiency, the present flexographic press is to focus on improving drying capacity. General use of natural wind, hot air and infrared drying and other methods. Some combination of machinery and equipment has two sets of UV-curing systems. In this way, will find proofing or production of a phenomenon, that is the same version of a film made of a set of horizontal size could hold bias, the error-hour less than 1 mm; error is large there is 2 mm -3 mm. In actual production, there is no problem if the film or plate, then the horizontal size of the deviation is due to the wet and dry printing process causes two opposite effects.

     About 50% water-based ink composition is water, then, for the tissue, if large-scale water-based printing ink, paper, printing the wet surface and widened expansion occurs, the printing area of the greater number of lines, the lower anilox roller, broadens the more obvious the phenomenon. After drying, the printing, paper, shrink due to the narrow, plus the greater heat and moisture more volatile, then the paper width narrows to become more severe. Most flexo machine heating and drying systems (including UV-curing systems) has a minimum speed to start working point, such as 20 m / min. For safety reasons, less than the value of this speed, the infrared and ultraviolet drying device is not opened; at or above this value will open. If the boot speed slightly higher than the value of this rate, then the paper greatly increases the heat, contraction is obvious.

     The farther apart the unit, the greater the horizontal overprint error. Therefore, in the printing production process, it should enhance the speed and minimize unnecessary printing of hot air and infrared drying, thus avoiding horizontal overprint error. In addition, in a printing process is suitable to improve the machine speed, the same error also occurs overprint. Tension, machine speed and temperature with a constant value, is often 1:1.2