The reason for the occurrence of blister during rotogravion is usually: stain on the nickel mesh; bubbles in the sensitized adhesive; dirty spots on the pellicle; too thin and underexposed
The solution to this method is:
Nickel mesh should be cleaned with a special washing mesh before use to enhance the adhesiveness with the glue.
In the process of preparing the photosensitive adhesive, the photosensitizer and the glue are mixed and stirred, which will cause the air in the glue liquid to flow and generate bubbles. If it is used immediately, it will produce blisters after the film is coated and dried on the mesh. 10 hours, fully defoaming before use.
Dirty spots on the manuscript were removed with cotton balls and anhydrous ethanol.
According to the viscosity index of the photosensitive adhesive provided by the manufacturer, do not arbitrarily add water to dilute, so that the thickness of the adhesive layer is maintained after the rotary screen is coated. Especially in the case of low mesh mesh (example 60 mesh), the viscosity of the emulsion is particularly important, too thin and too thick will affect the film forming properties of the glue.
According to the requirements of flower shape, grasp the correct exposure time, and check whether the UV lamp used for exposure is aging or not. When it is too long, it should be replaced promptly.
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