1. Stick back
Phenomenon: After the plastic woven bag is printed, the ink layer sticks to each other. Reasons for the failure: 1. There is a false appearance after printing. 2. The angle of the drying device is wrong or malfunctions. 3. The rewinding is too tight because the printing speed is too fast. 4. The storage stack pressure is too large. 5. The ink is too thin to penetrate and print through.
Exclusion methods: 1. Improve ink drying speed. 2. Increase ventilation and check the angle of the drying device. 3. Slow down the printing speed. 4. When printing, the stacking should be less or the storage stacking load should be lighter. 5. Adjust the ink viscosity or change another ink.
2. Poor printing fastness
Phenomenon: After the plastic woven bag is printed, the ink layer is discolored. Causes of failure: 1. The corona on the PPPE surface has not been handled properly. 2. The temperature and relative humidity of the printing workshop are too large. 3. The difference between the dissolved hydrogen bonding force of the ink system and the woven bag substrate is too great.
Exclusion methods: 1. The surface of the woven bag substrate reaches about 38 dynes. 2. Try to control the relative humidity of the workshop between 50-60%, but not too low, when it is less than 40%, it is easy to produce static electricity. It is best to control the room temperature at 18 to 23 degrees, and keep the environment clean and air circulation. 3. The selection of ink should be very careful (same nature), the use of ink should be appropriate, as far as possible the viscosity is small and the ink system resin content is high.
3. When through printing or migration printing, the size of the longitudinal pattern shrinks or stretches
Causes of failure: 1. The ink is too thin (that is, the viscosity is too small). 2. The paper or plastic substrate is loose. 3. The amount of ink is too large. 4. The printing pressure is too heavy. 5. The film formation is too slow.
Exclusion methods: 1. Mix in original ink or add thickener. 2. Replace dense substrates. 3. Change to a dry ink or add a solvent that evaporates quickly. 4. Adjust (reduce) the ink supply. 5. The printing pressure should be light.
4. Block version
Causes of failure: 1. Mainly the dryness of the ink on the printing plate makes the ink transfer poor. 2. Mixing of plastic or paper scraps. 3. Ink skinning.
Remedy: 1. Adjust the blowing angle (not directly on the printing plate). 2. In addition to changing the substrate, the base paper, plastic or film should be mixed with the ink fountain ink on the upper side of the printing machine. 3. Change the new ink
5. Bleeding
Causes of failure: 1. There is color bleeding at the edges of printed graphics (generally due to the use of dyes in the ink). 2. Improper use of pigments. 3. Too much thinner is used, especially the poor solubility of thinner and ink.
Exclusion methods: 1. Add gold oil or coupling agent to the ink. 2. Replace the new ink. 3. Minimize the use of thinners, especially solvents that are miscible with the ink.
6. The ink film is matt
Causes of failure: 1. Poor gloss. 2. The ink is rough. 3. The ink dries too quickly. 4. The matting agent is added in the ink system with little or wrong resin composition.
Removal method: 1. Add proper amount of ink in the ink. 2. Re-grind or filter the ink. 3. Add water or original ink. 4. Add as little or no matting agent as possible (such as wax, white carbon black, etc.).
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