Common quality problems and solutions of the hotte

Common quality problems and solutions of carton printing

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besides packaging goods and facilitating transportation, cartons also beautify goods. Rigid polyurethane foam also has air tightness, which is attributed to its high hole closure rate and the role of advertising goods. Therefore, the printing quality of cartons is very important. So, what are the common quality problems and solutions of carton printing

I. poor machine imprinting related parts

problem: when the printing plate roller shaft head, imprinting roller shaft head, transmission shaft, gear and important parts associated with imprinting are worn and loose, the printing plate roller or imprinting roller will jump or slide during the imprinting process. Due to unstable pressure, the contact between the printing plate and the paperboard is abnormal, Cause the problem of paste plate or unclear imprinting of local pictures and texts on the printing surface of paperboard

method: 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

II. Improper adjustment of the pressure roller

problem: 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, and there will be dirty version, paste version or unclear local graphic imprint

method: adjust the pressure roller to the appropriate position to make the gap between the pressure roller and the roller adapt to the thickness of the cardboard, so as to ensure the position of the printing plate and avoid the occurrence of this fault phenomenon

III. poor inking roller

problem: when the inking roller shaft head is loose, and the inking roller body is bent, deformed or damaged on the surface, it will also cause dirty layout, paste version or unclear local graphics and texts

method: 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

IV. uneven thickness of corrugated board

problem: when there are artificially damaged dent marks on the surface of the formed corrugated board, the paper surface of the dent will also have quality defects with unclear marks. If the printing pressure is fully increased to make up for it, it is easy to cause the quality problems of text and line layout

method: in order to avoid and equip the corresponding pendulum layout from pasting, the corrugated board should be handled, placed and pressed gently (the stacking height should be controlled) in the process of stacking and handling. It is forbidden to use bad production habits such as throwing, smashing and pressing for handling

v. uneven thickness of printing plate

problem: when the thickness of rubber plate is uneven, the height difference of printing plate will appear. Where the layout is high, it is easy to paste the version, and where the layout is low, it is easy to appear incomplete inking, resulting in unclear impressions

method: sporadic plate making can be used. If the plate is made into several small pieces, the same plate should be made separately, so that its thickness difference is relatively small. If there is a thickness difference in the prepared rubber plate, it can be made up by adding a layer of adhesive tape on the back of the partially thin printing plate to keep the whole printing plate basically the same thickness, so as to ensure the uniformity of printing pressure and inking of the plate

VI. improper color sequence

problem: if the pictures and texts with a full page are arranged in the first color group for printing, when the corrugated board enters the next color group mechanism for printing, due to the high accuracy of the first color group of the board, the printing pictures and texts of the first color group have large inking volume and slow drying speed, which is easy to transfer the print marks and cause the page dirty

method: arrange the layout with small area in the first color group for printing. 1. Requirements for the utilization of general metal and non-metal samples: arrange the layout with large area in the subsequent color group for printing, which can avoid the phenomenon of dirty version caused by imprint transfer

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