First, differences in temperature. When the temperature is high, the ink becomes thinner and the ink output volume increases, so the printed colors will appear darker. When the temperature is too low, the ink viscosity increases, ink flow becomes less smooth, and the output volume decreases, resulting in lighter printed colors.
Second, differences in humidity. When humidity is low and the air is dry, the equipment is prone to ink misting during printing. When humidity is high and the environment is damp, the printed ink doesn't dry easily, leading to blurred edges and fuzzy patterns.
Third, differences in printhead condition. Over time, the condition of the printhead will inevitably change slightly, so the print quality will naturally not be as good as it was a few months earlier.
Fourth, differences in the curing lamp. Over time, the intensity of the curing lamp weakens.
Fifth, differences in the ink. In daily production experience, you may also encounter a situation where a particular color in a certain batch of ink undergoes a color shift over a period of time.
The solutions are: Improve the temperature and humidity conditions in your workshop, maintain the printhead in good condition, match the curing lamp intensity appropriately, and choose a highly stable UV ink.