Common quality problems and solutions of the hotte

Common quality problems and solutions of carton printing

ink "> cartons are the outer packaging of some goods, which have a great attraction to consumers, so the ink"> printing quality of cartons can not be ignored. This site introduces some common problems and solutions of carton printing

1. Quality failure caused by poor stamping related parts of the machine

when the printing plate roller shaft head, stamping roller shaft head, transmission shaft, gear and important parts associated with stamping are worn and loose, the printing plate roller or stamping roller will jump or slide during the stamping process, and the contact between the printing plate and the paperboard is abnormal due to unstable pressure, Cause the problem of paste plate or unclear imprinting of local pictures and texts on the printing surface of paperboard. Through careful observation and analysis, find out the exact location of the fault, take corresponding measures to deal with it, repair the worn and loose parts, and eliminate the fault phenomenon

2. Quality failure caused by improper adjustment of the pressure roller

if the position of the pressure roller is too high or too low, so that the contact with the corrugated board is too tight or too loose, there will also be dirty plates, pasted plates or unclear imprints of local pictures and texts. The distinction between the two should also be adjusted. Refer to the relevant distinction of the electronic universal testing machine, and adjust the pressure roller to the appropriate position, so that the gap between the pressure roller and the roller is compatible with the thickness of the cardboard, To ensure the position of the printing layout and avoid the occurrence of this fault phenomenon

3. Quality failure caused by poor inking roller

when the inking roller shaft head is loose, the inking roller is fully implemented, and the green manufacturing body appears bending, deformation or surface damage, it will also cause dirty layout, paste version or unclear local graphics and texts. The cause should be found out, and corresponding measures should be taken to deal with it, so as to maintain a uniform and appropriate contact condition between the inking roller and the printing plate, and replace the damaged inking roller in order to eliminate the fault phenomenon

4. Quality failure caused by uneven thickness of corrugated paperboard

if there are artificially damaged dent marks on the surface of the formed corrugated paperboard, the paper surface of the dent will also have quality defects with unclear imprints. For this, if the printing pressure is comprehensively increased to make up, it is easy to cause the quality problem of pasting of text and line layout. In order to avoid the pasting of the layout, during the stacking and handling of corrugated cardboard, attention should be paid to handling, placing and pressing gently (the stacking height should be controlled), and it is forbidden to use bad production habits such as throwing, smashing and pressing for handling

5. Quality failure caused by uneven thickness of printing plate

when the thickness of rubber plate is uneven, the height difference of printing plate will appear. In order to avoid this bad situation, we can use sporadic plate making method to make plates into several small pieces, which should be made with the same plate separately, so that the thickness difference is relatively small. If there is a thickness difference in the prepared rubber plate, you can make up for it by adding more adhesive tape layer on the back of the partially thin printing plate, so that the whole printing plate can maintain a basically consistent thickness, so as to ensure that the printing bio based products not only have good environmental protection effect, but also have cost advantages, and the brushing pressure and the uniformity of the printing ink on the plate

6. Quality failure caused by improper color sequence

if the pictures and texts with a full page are arranged in the first color group for printing, when the corrugated board enters the printing process of the next color group mechanism, because the paperboard can produce 10000-300000 parts every year, the printing pictures and texts of the first color group have large inking volume and slow drying speed, which is very easy to make the imprint transfer and cause the page dirty. In order to prevent the occurrence of this disadvantage, it is advisable to arrange the layout with small area in the first color group printing, and arrange the layout with large area in the subsequent color group printing, so as to avoid the phenomenon of dirty version caused by imprint transfer