News
News

Explorer of innovative chemical new materials for industrial application

Belonging to ink leveling agents

time:2020-10-27
share:

Ink flow hanging, also known as flow hanging, refers to the phenomenon of ink sagging when printing on a vertical plane. In the area where flow hanging occurs, the thickness of the ink film becomes uneven, resulting in accumulation. We know that the forms of streamers vary greatly, some with large areas resembling curtains, while others have water patterns, water columns, ripples, vortices, and so on.

属于油墨的流平剂

The occurrence of so-called ink flow failure is often directly related to the rheological properties such as low solid content, low viscosity, printing ink film thickness, and ink yield value in the printing ink system. Packaging printing ink has low viscosity and thick ink film, which helps with leveling and is also prone to sagging; The ink system has a high solid content and viscosity, and the printed ink film is thin, which helps to prevent sagging. However, it is not easy to flatten, and sagging and flattening are often contradictory. The anti sagging agent in the printing ink can form a network structure through secondary bonds, making the printing ink obtain structural viscosity and become a thixotropic fluid. It is an effective additive to adjust this contradiction.

 

The leveling of ink film is the process in which printing ink gradually shrinks into a small area due to surface tension after printing, even after the film is coated and has not yet dried into a solid dry film. Often, under the influence of certain factors, there is a difference in surface tension, which prevents the ink film from achieving a smooth and flat surface state, resulting in uneven flow. This phenomenon is called ink leveling defect or unevenness fault. Furthermore, after the ink film dries, irregular surface conditions such as orange peel, scratches, ripples (water marks), shrinkage edges, pinholes, etc. appear on the surface. The time required for ink film leveling increases with the increase of ink viscosity, scratches, and wavelength, and decreases with the increase of surface tension and ink film thickness.

 

To prevent the malfunction of the printing ink film mentioned above, leveling agents are added to solve it. Leveling agent is an additive added to ink to form a smooth and even ink film after packaging printing. Organosilicon leveling agents only seek results, not the leveling process.

More information