Problems encountered in ink printing of the hottes

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Problems encountered in the printing of water-based plastic woven bag ink

1. Back adhesion

phenomenon: after the printing of plastic woven bag, the ink layers adhere to each other. Failure causes: 1. There is a dry illusion after printing. 2. The angle of the drying device is wrong or malfunctions. 3. Because the printing speed is too fast, the rewinding is too tight. 4. The storage pile pressure is too high. 5. The ink is too thin and permeable

Troubleshooting: 1. Improve the ink drying speed. 2. Increase ventilation and check the angle of drying device. 3. Slow down the printing speed. 4. Stack less or store less when printing. 5. Adjust the ink viscosity or change another ink

2. Poor printing fastness

phenomenon: after the plastic woven bag is printed, the ink layer fades. Cause: 1. The corona on the surface of pppe is not handled well. 2. The temperature and relative humidity of the printing workshop are too high. 3. The dissolved hydrogen bond force of the ink system is too different from that of the woven bag substrate

Troubleshooting: 1. The surface of woven bag substrate reaches about 38 dyne. 2. Try to control the relative humidity of the workshop between 50-60%, but not too low. When it is lower than 40%, it is easy to generate static electricity. It is best to control the room temperature at 18 ~ 23 ℃, and keep the environment clean and ventilated. 3. The selection of ink should be very careful (with the same nature), and the use of ink should be appropriate. It is better to use ink with low viscosity and high resin content in the ink system

3. During transparent printing or migration printing, the longitudinal pattern size shrinks or lengthens

fault cause: 1. The ink is too thin (that is, the viscosity is too small). 2. Loose paper or plastic substrate can still keep in touch and make sure the child's location is thin. 3. Too much ink. 4. The impression is too heavy. 5. Film formation and drying are too slow

elimination methods: 1. Add raw ink or thickener. 2. Replace the dense substrate. 3. Change to dry ink or add fast volatile solvent. 4. Adjust (reduce) the ink volume for the layout and construction of two hundred billion level new material industrial clusters, namely, new chemical materials, high-performance fibers and composites. 5. The impression should be light

4. Blocking

cause of failure: 1. The main reason is that the ink on the printing plate is dry, which makes the ink transfer poor. 2. Mixing of plastic or paper scraps. 3. Ink scaling

Troubleshooting: 1. Adjust the blowing angle (do not blow directly onto the printing plate). 2. In addition to changing the substrate, the upper side of the printing machine should be separated by base paper, plastic or film mixed with ink bucket ink. 3. Replace with new ink

5. Color bleeding

cause of failure: 1. Color seeping on the edge of printing text (generally caused by the use of dyes in the ink). 2. The pigments used are not matched properly. 3. Too much thinner is used, especially the miscibility between thinner and ink is poor

Troubleshooting: 1. Add gold adjustment oil or coupling in the ink. In addition, the material of this part is metal agent. 2. Replace with new ink. 3. Use as few thinners as possible, especially solvents that are miscible with ink

6. Yesterday, leaders of a large spring factory in Xi'an came to our company to visit the experimental machine. The film is matte

cause of failure: 1. Poor gloss. 2. The ink is rough. 3. The ink dries too fast. 4. The resin composition of the ink system is less or the matting agent is added by mistake

exclusion method: 1 Add an appropriate amount of ink blending oil into the ink. 2. Regrind or filter the ink. 3. Replenish water or original ink. 4. Try not to add or add less matting agents (such as wax, white carbon black, etc.)

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