① Proficiency of the operator. Different kinds of materials, different photo album printing ink thickness and different printed pictures and texts have different requirements for UV drying devices. On the printing machine, the power of UV curing, the printing speed of photo album and the thickness of ink layer can be adjusted. If the operator does not handle this relationship well, the effect of UV drying operation will be affected.
② Ink quality. At present, there are many suppliers of UV ink on the market, and the quality is not the same. The drying speed and curing degree of different color inks from the same manufacturer are also different. Because of the ink itself, ink often dries up (especially black ink), even experienced people occasionally have such problems.
③ UV curing device for printing photo albums.
A. The ultraviolet lamp tube is aging, so the output power of the gun can't reach the design power, and the energy is not enough.
B. There is too much dust in UV equipment, which affects the output power of UV light source.
C. the output power of uv device is small, which can not meet the requirements of ink curing.
(4) material aspects. The surface tension of printing materials, especially film materials, is the main reason that affects the fastness of ink, so it is necessary to check the surface tension before printing.
In order to ensure the best quality of UV printing, we should pay attention to the following points:
① Improve the level of operators, adjust equipment correctly and make full use of UV curing equipment.
② Select the best high-quality ink that matches the printing materials.
(3) Corona treatment is required for membrane materials to make the surface tension at 40&; Above p/cm.
④ Adjust UV device, replace lamps and reflectors in time, and clean and maintain them regularly.
⑤ Test the drying ability of UV device and adjust the power to match the curing degree of picture book printed matter.