To make the UV offset printing work better, need to solve main problems are as follows:

A, design, plate making

Production UV printing design draft must be decided according to the repair order output formats, such as the membrane surface is sweep or sweep, output cables and cable Angle, etc.Some special up higher requirements, such as 3 d printing resolution is higher, cable Angle must be compatible and substrates, avoid net;Transparent plastic sheets and aluminized paper often need white ink printing, printing materials should be paid attention to the influence of scale, this revised film in advance in order to achieve the best quality.

Second, the adhesion

Because the substrates such as plastic sheets or gold and silver cardboard with poor permeability, the ink absorption ability is weak, so even if the UV printing ink, ink adhesion is poor also, print quality is not high.Can be based on the material surface treatment to solve.

Three, ink emulsification

UV ink ink balance the narrow tolerance, is easy to cause in the printing ink emulsification, dirty version, affect the printing quality.

The solution: reduce the printing speed, the printing speed control in 5000 ~ 8000 / hour.

Fourth, curing degree

In order to improve the print color saturation, in substrates such as plastic sheet surface of UV printing, printing brush pressure is bigger, the ink layer thick, branches increasing serious, which makes the ink is not easy to cure.To ensure the quality of printing, the printing pressure can't be a big adjustment.Solution is to first moderately reduce the printing speed, make the UV lamp irradiation time lengthened appropriately, let the ink completely curing;Followed by adjusting the distance between UV lamp and substrates, increase the intensity of UV light, make the ink curing.UV cure effective wavelength range is 200 ~ 400 nm, printing workshop in some light wavelength in the range, also can cause slight curing ink surface, so we should pay attention to the ambient light for the influence of UV ink.

Five, the color sequence arrangement

The UV offset printing color sequence arrangement problem is more complex.Because of the limitation of lis principle of substrates on the ink layer thinner, when need more thick ink layer, print is difficult to achieve the desired print effect.Such as four-color overprint, usually use black, green, magenta, yellow color series, because black almost fill all the empty room, green, magenta, yellow ink forme force is lower, total quantity of ink is not enough, it will cause the color is not full.

Solution: the more identical sequence, first the color of the printing ink quantity is small, the last ink quantity larger black, so that it reached the highest amount of inking colour more full.

Six, printing alignment

UV offset printing for ink using UV light curing, curing of the main problem is to make the substrates under the heat expansion, resulting in misregister.The inconsistent with the UV curing ink, because the ink curing need UV lamp irradiation time longer, and printing set of guidelines need UV lamp irradiation time shorter.

Solution: at the last color printing for UV curing, after this time even if the substrates, placed by lower temperature for a period of time, can also be made to minimize the deformation of substrates.In special cases, demitint group also can open the UV light, but the shorter the irradiation time, the better.Or can use cold UV technology.