Fifth, the word is not clear
1. Phenomenon: Small prints and fine prints are not clear (blurred).
2. Reasons: (1) The plate is too hard, and its sharpness or flatness is not good. (2) Ink is poor and fineness is not enough. (3) Improper solvent formulation, too fast evaporation, unstable ink transfer, slow machine speed. (4) Printing operation problems (insufficient or inconsistent pressure). (5) The text is too thick and fuzzy. (6) Substrate surface roughness, strong ink absorption. (7) Machine overprinting accuracy is not enough, so that the overprint accuracy of the Yin type text is poor. (8) The paste of the plate is inaccurate, the thickness of the adhesive double-sided tape is not uniform, or there are bubbles in the paste. (9) Ink cleaning is not clean, dry and fixed in the groove of the anilox roller. (10) The viscosity of the ink is large and the transfer is not uniform (at constant temperature).
3. Solution: (1) Re-plate to make the ink even. (2) Replace the ink and measure with a 50mm fineness scraper. (3) Adjust the solvent formulation. (4) Pay attention to correct operation. (5) adjust the amount of ink. (6) Replace the substrate to minimize ink diffusion and improve surface roughness. (7) Check, adjust so that the circle jump is less than 0.015mm, the parallel level is less than 0.03mm, and the accuracy of multiple overprinting is within 0.1mm, so that the diffused version forming brush will pass the negative type. (8) inspection, correction. Replace the sticky tape and carefully stick it according to the operating instructions. (9) Clean. (10) Reasonably adjust and promote transfer. [FS:PAGE]
Sixth, false overprinting of spot color gold and silver ink
1. Phenomenon: After the gold and silver inks are printed, they can still see spot color ink leaking.
2. Reasons: (1) Gold ink is thick and has a large amount of ink, so it is not easy to dry and has a large viscosity. (2) Printing pressure is large, forming ink. (3) The amount of ink is small and the ink layer is not thick enough. (4) The fineness of the gold ink is not enough, the quality of the connecting material is not good, and the inherent quality of the ink is problematic. (5) The paper surface is rough. (6) The time interval between the printed background and the printed gold and silver ink is too long. (7) The surface tension of the two inks differs greatly, and the upper ink (gold ink) pigment cannot uniformly cover the lower ink layer.
3. Solution: (1) Add appropriate amount of fast-drying solvent to gold ink, and use slow-drying agent for spot color. If the printing effect is not affected, the ink viscosity may be kept as modest as possible. Large areas of gold printing, speed should be reduced to increase the ink drying time. (2) Adjustment is reasonable. (3) In order to enhance the sense of metal, the ink of gold and silver shall be printed full and thick, and the viscosity of real-time gold and silver ink shall be slightly larger, but the dot of ink or thin lines shall be similar to the viscosity of ordinary ink. (4) swap other suppliers ink. (5) to deal with or exchange. (6) Time cannot be spaced too long, and printing is done when the bottom ink is not dry. (7) Corona treatment can be increased to change the surface tension, increase adhesion, and reduce the viscosity of the second color. Spot ink panels can be hollowed out to enhance metal adhesion.
Seven, graphic distortion or incomplete
1. Phenomenon: Incomplete printing of web sites and characters.
2. Reasons: (1) Roller roundness is not enough. (2) The roller surface is dirty and not smooth. (3) Unbalanced pressure at both ends. (4) Wrinkles or tension of the substrate is not suitable, the smoothness is poor, and the fibers are unevenly arranged. (5) The ink roller in the ink fountain does not rotate smoothly. (6) The viscosity of the ink is too high and the flowability is poor. (7) The ink is volatilized too quickly, the ink transfer roller absorbs ink less, and the ink supply is insufficient, resulting in incomplete transfer of printing. (8) Poor plate quality (over-concentration of ozone, local unevenness). (9) The sticker is uneven, so that the image and text after imprinting are deformed, the printing plate is repeatedly detached and affixed, the plate material itself is deformed, and the printed image is deformed. (10) The plate diameter was selected incorrectly, causing large deformation of the plate. A flexographic plate is a highly elastic plate that, when mounted on a plate roll, will inevitably affect the plate surface image, graphics and text. The printed product can not reproduce the original correctly, and even cause serious deformation.
3. Solution: (1) Replace the precision roller. (2) Cleaning. (3) adjust the pressure, when the printing pressure is too small, the transfer of printing graphics is not complete. The dot is not true, and the color is pale, making the original defects of the printing plate and paper more visible. When the printing pressure is too high, it will cause graphic lines to be distorted and the prints will be enlarged. Compared with normal pressure friction conditions, the wear of the printing plate is increased, the printing resistance is reduced, the load of the machine is increased, the power consumption is also increased, and the printing department has greater bearing capacity, which affects the working life of the components. . (4) Replace the printing material. (5) Adjust to make it flexible. (6) Adjust the viscosity properly. (7) Adjust the ink. (8) Reasonable transmission of ink. (9) Strictly check the flatness and the integrity of the graphic and text. Image-based products should refer to or take into consideration originals, and check from the image to the tone, level, color, sharpness, and three-dimensional effects. The text should be the main word, and the text should be correct, in accordance with the typesetting rules, and the uniform ink color. an examination. The plate maker recalculates the deformation rate and re-posts. (10) When the plate standard is correct, try to select the standard, the correct double-sided adhesive tape, and the plate roller diameter.
Eight, water pattern
1. Phenomenon: According to the direction of the paper, there is a clear ink transfer pattern and the print is uneven.
2. Reasons: (1) The substrate has poor surface smoothness and paper lines. (2) The ink has low viscosity, thinness and poor hiding power. (3) Poor flow of ink. (4) There is a problem with the production of the mesh on the surface of the roller. (5) The amount of ink is too large, the paper can not be transferred, absorbed, deposited on the surface of the substrate. (6) Production of printing plates. (7) The roller is dirty.
3. Solution: (1) Calendering to increase smoothness or change paper. (2) Add original ink to increase viscosity and color concentration. (3) Use ink with good fluidity. (4) Manufacturer's replacement. (5) Change (reduce) the amount of ink or switch to printing in two passes. (6) Plate change (7) must be clean.
Nine, dry version
1. Phenomenon: In the printing ink process, the pattern is blurred, the small print is incomplete, and the print is not uniform in thickness. Ink and ink are solid on the plate.
2. Reasons: (1) The speed is too low. (2) There is no cleaning of the plate after shutdown or no regular or irregular cleaning of the plate during printing. (3) Ink drying is too fast. (4) The ink volatilizes excessively and the PH value drops.
3. Solution: (1) Appropriately increase the speed. (2) Timely and irregular cleaning of the printing plate in the timely cleaning of the plate or printing process after shutdown. (3) Add appropriate amount of slow-drying agent to adjust. (4) The appropriate amount of stabilizer is added to adjust the pH. [FS:PAGE]