Blocking, poor ink transfer, and missing dots, these three failures must appear frequently? And, because the performance results are similar, it is particularly difficult to distinguish. Want to learn the tricks of "grabbing"? Then look down! 1. Block version In gravure printing, the blocking phenomenon is generally manifested as: the light dot version cannot be transferred (such as human skin color); the amount of ink transfer of the deep dot version is reduced, usually from 50% to 70% to 20% to 30%. cause: ①During printing, the viscosity of the ink increases due to the evaporation of the solvent, and it cannot enter the fine mesh holes or mesh lines, so that the ink gradually dries and causes blockage. ②During printing, the distance between the doctor blade and the plate cylinder is too large or the angle is unreasonable; due to the large diameter of the plate cylinder or the depth of the ink tank is not enough, the hot air blown from the drying equipment affects the plate cylinder and can also cause blockage Version. This situation is very common in domestic printing presses. ③ The engraving depth and angle of the net hole of the printing plate are not suitable. ④The temperature of the printing environment is too high, which makes the solvent volatilize too fast, causing blockage. ⑤The ink of curing agent series is added, and the ink is cured in the printing plate net hole with the increase of the time of the machine, which gradually reduces the depth of the printing plate and causes blockage. ⑥ The formula design of the ink is unreasonable, and a solvent with a fast drying speed is used. solution: ①Adjust the drying speed of the ink, and choose a slow-drying solvent according to the actual situation. ②Add ink to adjust the ink to improve and increase the fluidity of the ink. ③After printing, immediately clean the printing plate. ④According to the actual printing situation, add a suitable solvent in time to ensure the consistency of ink printing viscosity. ⑤Redesign the ink formula, reduce the initial drying of the ink and the drying of the ink, increase the fluidity and transferability of the ink. ⑥ For blockage caused by curing agent, no or less curing agent should be added as much as possible; if it is really necessary to add curing agent, it should be frequently checked whether there is a blockage situation, and timely treatment. 2. Poor ink transfer In printing, due to the poor transferability, the amount of ink transferred to the plastic film does not meet the color density or saturation requirements of the original design and standard printing samples, and printing failures occur. cause: ①Due to blocking, the drying speed of the ink on the printing plate is too fast. ②The selected inks do not match and cannot be glued and attached to the plastic film. ③Ink formula design is incorrect, resulting in light color of the ink or insufficient color saturation of the ink itself. solution: ①For the failure caused by printing blockage, analyze the reasons for blockage and take corresponding countermeasures. ② Change to the ink type that matches it. ③Improve the ink formula and select appropriate raw materials in a targeted manner, such as the use of pigments with strong color saturation and high tinting power and resins with good transferability. 3. Missing outlets During the printing process, the uniform flat screen on the printing plate cannot be leveled due to the ink, and the dots appear alone, forming a filter screen shape, and even dots are missing. Generally, this phenomenon is more obvious from the second color group. cause: ①Ink viscosity or yield value is too high, resulting in poor ink transferability. ② The ink dries too fast, and is not evenly distributed on the printing plate, it is dried and cured too early. ③ The wettability between the ink and the printing plate is poor (the surface tension does not match), and the transferred ink is not easy to spread. ④The pressure of the doctor blade is large, but the pressure of the printing rubber roller is insufficient. ⑤ The printing plate network cable is too thick, the interval between the mesh holes is large, and the ink is not easy to spread. solution: ①Reduce the viscosity of the ink and improve the transferability of the ink, it is recommended to use special additives for gravure ink. ②Adjust the position of the doctor blade holder to shorten the distance between the doctor blade and the plate cylinder. ③Use slow-drying solvents to reduce the ink drying speed and increase the dot increase rate. ④Adjust the scraper pressure and printing rubber roller pressure. ⑤ Re-making the plate to change the shape and angle of the net hole. 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