1、 Poor machine imprinting related parts

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

Methods: 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、 Improper adjustment of 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.

Methods: 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 paperboard, so as to ensure the position of the printing layout and avoid the occurrence of this fault phenomenon.

3、 Poor inking roller

Problem: when the inking roller shaft head is loose and the inking roller body is bent, deformed or damaged, it will also cause dirty layout, paste version or unclear local graphics and text.

Methods: find out the causes and take corresponding measures to deal with them, so as to maintain uniform and appropriate contact conditions between the inking roller and the printing plate, and replace the damaged inking roller in order to eliminate the fault phenomenon.

4、 Uneven thickness of corrugated board

Problem: when there are artificially damaged concave marks on the surface of the formed corrugated board, the paper surface of the concave part 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 problem of pasting of text and line layout.

Methods: in order to avoid the pasting of the layout, during the stacking and handling of corrugated board, attention should be paid to light handling, light handling and light pressing (the stacking height should be controlled), and bad production habits such as throwing, smashing and pressing should not be used for handling.

5、 Uneven plate thickness

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 have incomplete inking, resulting in unclear imprints.

Methods: sporadic plate making can be adopted. If the plate is made into several small pieces, the same plate should be made separately, so that the thickness difference is small. If the thickness difference of the prepared rubber plate exists, it can be compensated by multiple adhesive tape layers on the back of the locally thin printing plate, so as to keep the whole printing plate basically the same thickness and ensure the uniformity of printing pressure and printing ink on the plate.

6、 Improper color sequence

Problem: if the pictures and texts with full layout are arranged in the same color group for printing, when the corrugated board enters the next color group mechanism for printing, due to the large amount of ink and slow drying speed of the printed pictures and texts of the same color group, it is easy to transfer the imprint and dirty the layout.

Methods: arranging the small layout in one color group printing and the large layout in the subsequent color group printing can avoid the phenomenon of dirty version caused by imprint transfer.

Tom (oversea manager) Phone:0086 13303078975 / 17772697357(whatsapp,wechat,line)

Email :cartonmachine.tomwang@aliyun.com

https://www.wdcartonmachine.com