UV INK

How to solve the UV INK printing problems?

UV INK PRINTING PROBLEMS

In the various series of UV ink, due to the variety of UV screen printing ink, involving a wide range of applications, requirements are also diverse, more problems, the following focuses on UV screen printing ink in the printing of common problems and treatment methods.

1. The phenomenon of long-term layering of ink. Gloss oil is more obvious, is a normal phenomenon, after opening the ink, must be fully stirred evenly before printing on the machine. It can avoid affecting the surface effect of printed matter due to the long-term layering of ink, such as defoaming and flow equality.

2.Paste plate phenomenon. Embossing polish, refraction, foaming, frosting and other products are prone to this phenomenon, the reason is that the viscosity of such products is large, in printing, if the screen tension is not enough, the screen distance is too low, the scraper is soft, the ink is uneven or too thick, the pressure is not enough and other factors, it is easy to appear this phenomenon, at this time to improve the printing process properly; In terms of ink, thinner can be appropriately added to adjust.

3.the printing pattern is not fine, occasionally incomplete phenomenon. The main reason lies in printing and ink, printing: insufficient pressure, scraper hardness is not enough, screen mesh is low or tension is not enough. Inks: The variety is not suitable, the wettability of the substrate is not enough, or the ink has been partially seen in light curing to affect the effect of the screen (this phenomenon may be due to window printing, strong light printing or UV light fixing machine residual irradiation caused by the screen plate).

4.There are bubbles and concave spots on the surface of the UV Ink printing pattern. The possible reasons are:

①The ink is not fully stirred when used, the additives on the edge of the ink jar and the lid are not fully mixed with the ink, thus affecting the defoaming and leveling function.

②The ink viscosity is too large, especially in the case of low temperature, the ink viscosity increases, the defoaming ability is significantly weakened, at this time you can add diluents or additives to solve this problem.

③ There is more dust or impurities on the surface of the substrate itself.

④The ink itself is polluted by impurities in the printing process, at this time, new oil needs to be used, and the screen can be cleaned before printing.

⑤The substrate itself is too absorbent, UV ink penetration is serious, and small pitting spots appear on the surface of the printed matter.

5. UV ink printing adhesion is not good. The possible reasons are:

①The selection of UV ink is not appropriate, the variety of substrate, its own polarity, flexibility, surface treatment degree, cleanliness, post-process requirements and other factors will affect the adhesion of the ink. In general, the greater the polarity of the substrate, the higher the degree of surface treatment, the easier the ink is to attach.

②UV curing equipment: the line power of the UV lamp is low, the penetration capacity is not enough or the overall energy is not enough when printing curing (such as the power of the UV lamp is not enough, the transmission speed is too fast, etc.), resulting in incomplete UV ink curing, ink performance is not fully played, resulting in insufficient adhesion.

③Printing: the process has not reached the best state, the ink layer is thick or thin, the color order is wrong, and the use of supporting additives is improper, resulting in a decrease in the binding force of the ink and the substrate after printing or the UV equipment cannot fully cure the ink, resulting in a decrease in adhesion.

6. printed matter surface sticky flower, the main reason is:

printed matter printing ink after stacking and post-processing, sticky flower phenomenon mainly occurs in the stacking link and post-processing die cutting link. It is especially easy to occur in the summer when the temperature is higher or when printing thin double copper paper, the main reason is that the UV ink is not fully cured and timely heat dissipation. At this time, it should be considered from the following aspects:

① ink varieties, some UV inks have good flexibility and adhesion but poor viscosity resistance, and ink selection corresponds to a good balance of relevant properties.

② the type of substrate, for thin double copper paper, soft PVC and other materials, should do the corresponding anti-viscosity test.

③ In the printing process, the printing ink layer should be too thick and the lamination weight should be too large.

④ In terms of UV curing equipment, do a good job of ventilation and heat dissipation under the condition of ensuring full curing.

7. UV special effect ink printing problems encountered in

① UV wrinkle ink, wrinkle size control problem, due to the particularity of wrinkle ink, wrinkle size and wrinkle lamp power transmission speed, wrinkle to curing stage time interval, printing thickness is closely related, in the production process, should strictly control the relevant factors; The adhesion problem of wrinkles, due to the large contraction of wrinkles during curing, the adhesion will decrease, so for different substrates, different varieties of wrinkles should be selected. Especially on printed matte film paper, UVH-16035 wrinkles should be selected to ensure adhesion; In addition, the wrinkle ink also need to pay attention to the phenomenon of mildew, mainly occurs in gold, silver cardstock, this time should ensure that the wrinkles are fully wrinkled, fully cured, gold, silver cardstock invitation surface has a certain chemical resistance, after printing the paper should avoid moisture, mounting box, should pay attention to the glue water content should not be too large.

② UV scrub ink: should pay attention to the choice of varieties and supporting products. Matte film paper should choose UVB series to ensure the die-cutting performance and adhesion, in the printing UV scrub, we must pay attention to the mesh distance and the strength of the scraper and the size of the mesh, otherwise it is easy to paste or not sand.

③ UV refraction ink. When printing UV refraction, in addition to paying attention to the mesh moment and the strength of the scraper to prevent the phenomenon of pasting, the number of mesh mesh should also be strictly controlled, generally above 380 mesh, to improve the fineness of the line, and for refractometric oil, precision film drying is the key link.

④ UV embossing varnish, when printing UV embossing varnish, it must be noted that there may be a virtual edge or bubble problem when printing at a low mesh number (40 to 80 mesh). Therefore, the Angle of the scraper and the printing speed should be adjusted, the Angle should be small, and the speed should be slow.

⑤ UV foaming ink: Foaming ink is a relatively difficult printing ink, mainly due to the high requirements for the printing process, such as mesh, mesh distance, screen tension, scraper hardness and edge, printing speed, printing pressure, ink viscosity, printing to curing interval time and many other factors will significantly affect the foam pattern, therefore, in the test stage should be fully recorded.

⑥ UV snow ink: When printing snow ink, two sets of light curing machine are used. The previous group of light solid machine is generally a lamp called snow machine, UV energy is generally set low, about 18 ~ 20mj/cm2, used to induce flower; The latter group of light fixing machine is generally 5kw×2 lamps, and the energy is set to about 100mj/cm2 for full curing. The operation system of the two groups of light solid machine is independent, in order to use the running speed to adjust the size of the UV energy, it should be noted that the energy of the snow machine is too high or too low will affect the size of the snowflake pattern, dumb, thick, so the test should do the corresponding test and record work.

⑦ UV powder varnish, in the printing of UV powder varnish, generally add seven color powder or other color powder, using 40 to 80 mesh screen printing, but it should be noted that dark color powder (such as red powder, purple powder, blue powder, etc.) has a great impact on UV ink curing. At this time, the appropriate ink variety should be selected, or appropriately strengthen the UV curing energy, or reduce the amount of color powder added to ensure curing, in addition, this kind of gloss oil as a powder polishing oil can print a variety of papers (such as coated paper, white cardstock, gold, silver card, matte film paper, light film paper, absorbent paper, etc.), but if as a powder polishing oil or direct polishing oil, The adhesive ability or surface leveling effect is not ideal. At this time, other UV inks corresponding to the process should be selected.

8.UV ink preservation and printing environment problems

①preservation, should be stored in a cool and ventilated environment, the temperature is below 30℃; When in use, the ink bucket should be covered as soon as possible after opening, so as to avoid impurity pollution and reduce the quality problems caused by the contact between the ink and ultraviolet light.

②printing environment problems, should ensure that the printing environment is cool and ventilated, cool environment can avoid sunlight or UV curing equipment light irradiation layout, good ventilation helps heat dissipation, reduce adhesion, while good ventilation can also reduce some UV ink materials on the human skin, eyes irritation.

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How to solve the UV INK printing problems?

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