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Why is the ink on the aluminum foil bag not cleaned?

Release time:

2021-09-15

The aluminum foil bag is a bag made up of a variety of plastic films through a bag making machine. It is used for packaging food, pharmaceutical industrial products, daily necessities, etc., and the aluminum foil bag manufacturer will encounter the problem of the ink on the aluminum foil bag not being clean during production. , So why is the ink on the aluminum foil bag not cleaned? The editor will introduce it in detail below.

Why is the ink on the aluminum foil bag not cleaned?

1. Solvent drying is too fast or too slow

If the mixed solvent dries too fast, in addition to increasing the viscosity of the ink in a short period of time, it will also cause the ink to adhere to the free part of the plate roller, the solvent evaporates too quickly, and the ink attached to the plate roller will be gel-like , When the plate roller passes the doctor blade, due to the high adhesion of the gel ink, the doctor blade cannot scrape it off after the plate roller runs for a week, and it is directly brought to the printing substrate, resulting in unclean scratches mark.

The solvent itself volatilizes very slowly, causing the free part of the ink on the plate roller to not dry on the surface of the plate roller in time. Some ink is easily transferred to the substrate, causing dirty scratches.

2. The scraper assembly is too soft and the angle is too flat

The scraper assembly is too soft. When the angle is too flat, due to the action of air pressure, the scraper will bend on the surface of the plate cylinder, that is, at the scraper point, resulting in the scraper not being a "point" relationship, but a "surface" relationship. In this way, the free part of the plate roller cannot be scraped off effectively, that is, the ink on the part without dots, and it will also cause the scraping to be unclean.

3. The plate roller assembly is not concentric

The plate roller assembly is not concentric. In general, the beating within 10 lines will not affect the color registration and product quality. When the plate roller rotates from the side with the larger diameter of the ellipse to the side with the smaller diameter of the ellipse, the distance changes instantaneously. long. Since the scraper is an external force acting on the plate roller, there is a time difference during the conversion process, and the pressure forming a section of the scraper is relatively reduced in an instant, so that due to the beating of the plate roller, the pressure of the scraper is tightened and loosened within one cycle of the plate , causing local scratches.

4. Ink viscosity is too high

When the viscosity of the ink increases, its surface tension will increase accordingly, and the mutual force will also increase accordingly, so that the squeegee will increase the ink in the process of contacting the ink, and the impact force of the squeegee will destroy its balance point, resulting in The scraper cannot completely scrape off the remaining ink on the plate roller, which directly affects the quality of the product.