What problems do aluminum foil bags have in the printing process?

Aluminum foil bag printing can be used in relief printing, intaglio printing and flexographic printing.

Letterpress printing is suitable for small batch printing, intaglio printing and flexographic printing are suitable for large batch roll paper printing.

The following measures should be taken in the printing process: large printing pressure is required. Aluminum foil has strong barrier property and poor absorption, and the pressure makes the plate and the surface of aluminum foil contact with a larger area and forces the ink to adhere.

Hot air drying device must be installed for intaglio printing. Make a small sample before selecting the ink on the machine to test whether its hue, dryness and so on meet the requirements.

1. Poor printing fastness. For plastic substrate materials (such as plastic film), it may be due to insufficient film corona treatment, and the ink-printing ink has poor affinity with the printed material. Printing environment temperature, humidity and other reasons caused by large changes; Or poor printing fastness caused by large changes in temperature and humidity of the printing environment.

2, print ink layer scratches. Scratches on the guide roller, sand mixed in the ink, uneven scraper, improper Angle between the scraper and the plate are the causes of scratches on the printed product. We should make a correct judgment according to the specific situation of the scratch phenomenon, find out the specific reasons, and take corresponding measures to solve it.

3, the tone is thin. This failure is caused by thin ink color and poor reflection performance of color light. When excluded, the performance of the ink should be adjusted.