The transparent plastic box ear shrinkage hole is one of failures of the transparent packaging printing ink film due to poor leveling. After the ink is printed, the wet ink film retracts in the process of leveling and becomes a small circle, exposing the substrate material (bottom) or the upper ink layer. The main reason for shrinkage is that the surface tension of the upper and lower parts of the printed ink film is different.

Some people think: a wet ink film can be regarded as a double liquid ink film. In the film formation process, when the surface tension of the upper wet ink film is lower than the surface tension of the lower wet ink film, shrinkage occurs due to the wet material material relationship. Sometimes when the phenomenon is about to occur, the wet ink film loses its fluidity and happens to suppress the shrinkage phenomenon. For example, in some gravure or offset printing operations, the wet film may become fluid as the temperature increases, which may cause secondary shrinkage.

In theory: The remedy for the clear plastic box is to improve the flow and leveling of the wet ink film. The surface tension of the ink is not only low, but also the wettability of the substrate material. Because there is a tension difference at the interface between the upper wet ink film and the lower wet ink film, after the package is printed, the surface tension of the system is decreased, so that the printing ink will develop into a complete ink film from the development.

In order to correctly select the anti-crater agent for printing ink, the following describes various types of anti-crater agents.

Solvents: Introduced by manufacturers of transparent plastic cartridges, generally referred to as high-boiling mixed solvents, both as a good solvent and a good wetting agent for pigments (the solubility of the ink (film-forming) substances is deteriorated due to the volatilization of solvents. Produces shrinkage, or produces boiling marks, blisters, etc. in baked iron offset inks.)

Resins: Acetylcellulose is generally used, especially polyacrylate-resistant shrink-resin resins with limited compatibility. The dosage is: 1% to 1.5% of acrylic resin, 0.5% to 1% of epoxy resin, and 1% of polyester resin.

Silicone resins have the function of anti-shrinkage, leveling, anti-floating, and defoaming. For example, domestic XH204 water-based silicone oil helps to promote the flow, leveling, and brightening of printing inks in water-soluble acrylic inks.

It is a silicone-free fluorosurfactant which is a polymer surfactant. It is also very effective for preventing the shrinkage of the ink film, improving the leveling and improving the glossiness of the printing ink film.

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