Problems with plastic woven bags in ink printing

First, back sticky

Phenomenon: After printing the plastic woven bag, the ink layers adhere to each other. Causes: 1. There is a dry false phase after printing. 2. The angle of the drying device is incorrect or malfunctions. 3. Because the printing speed is too fast, the rewinding is too tight. 4. The storage pressure is too large. 5, the ink is too thin and transparent.

Remedy: 1. Improve ink drying speed. 2. Increase the ventilation intensity to check the angle of the drying device. 3, slow down the printing speed 4, stacking less when printing or storage stacking load should be light. 5. Adjust the viscosity of the ink or change the ink.

Second, poor printing fastness

Phenomenon: After printing the plastic woven bag, the ink layer faded. Causes: 1. The surface of the PPPE corona is not handled well. 2. The temperature and relative humidity of the printing workshop are too large. 3. The dissolved hydrogen bonding force of the ink system is too different from the dissolved hydrogen bonding force of the woven bag substrate.

Remedy: 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 lower than 40%, it is easy to generate 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 ink should be very careful (same nature), the use of ink should be appropriate, as small as possible, the viscosity of the ink system is high.

Third, bleed

The cause of the malfunction: 1. The edge of the printed graphic is infiltrated with color (generally due to the selection of dyes in the ink). 2, the use of pigments is not properly matched. 3. Excessive use of thinner materials, especially poor compatibility between thinner and ink.

Remedy: 1. Add gold oil or add coupling agent to the ink. 2. Change the new ink. 3, try to use less thinner, especially the solvent that can dissolve with the ink.

Fourth, the ink film is dull

The cause of the failure: 1, poor gloss. 2, the ink is rough. 3. The ink dries too fast. 4, the ink system resin components are small or wrong to add matting agent.

Remedy: 1. Add the appropriate amount of varnish in the ink. 2. Re-grind or filter the ink. 3. Replenish water or original ink. 4. Add no or less matting agents (such as wax, silica, etc.) as much as possible.