problem

reason

countermeasure

1. Adhesion.
The rolled up ink layer of the printed matter adheres to another contact surface (usually the back of the film), which hinders the rewinding and contamination of the printed matter and the peeling of the ink. The adhesion of the previous section is back when the stripping sound, or in the overlap of the ink surface presents abnormal luster

1. Ink drying too slow, false dry phenomenon.
2. There is residual solvent.
3. The temperature of printing and storage environment is too high.
4. The winding pressure is too high.
5. The coil is pressed heavily or impacted.
6. The moisture content of the base material is too large during winding.
7. There are too many additives in the substrate.
8. Different types of ink mix wrong.
9. The affinity between printing surface and contact surface ink is too strong.

1. Use appropriate solvent instead.
2. The drying device was reformed and the low boiling point solvent was used to give full play to the role of cooling roller.
3. The printed matter should be placed in a cool place, and the stacking time should be shortened as far as possible.
4. Reduce the winding tension.
5. It shall be placed upright, and collision is prohibited during transportation.
6. Make the water temperature of the cold roll higher than the indoor dew point temperature to prevent water condensation.
7. Replace the substrate.
8. Clear ink performance, old ink consumption as little as possible to add.
9. Selofen, nylon, corona treatment film on both sides and ink film have strong affinity and high risk, so we should discuss with ink factory in advance and take appropriate countermeasures.

2. Poor adhesion.

1. Wrong use of ink or mixed with different types of ink.
2. The surface treatment of substrate is not enough or the storage time is too long.
3. Excessive moisture absorption of the substrate.
4. Affected by additives in the substrate.
5. Due to the whitening and deterioration of ink.
6. Insufficient drying.

1. It should be absolutely avoided to use the ink for other purposes and mix different types of ink. In order to prevent misuse, the remaining ink should be clearly recorded with the product name, date, etc. for future use.
2. After corona treatment, wet tension liquid is used to check whether the required value is met.
3. Nylon and cellophane materials can only be used after confirmation.
4. The plasticizers, surfactants, lubricants, etc. contained in the substrate may hinder the ink adhesion. Therefore, for the film that has not been used for the first time, its characteristics should be mastered in advance.
5. Refer to (albino) and (metamorphism) items.
6. Use the drying equipment to heat within the allowable range.

3. The ink is not clean.
There is no line in the part of the scraper scraping, ink transfer to the film, the blank part is also attached to the ink, the version of the scraping is a surface.

1. The scraper is worn or abraded badly.
2. The pressure of scraper is too high or too low.
3. The quality of chrome plating is poor.
4. Plate roller eccentricity causes runout.
5. The ink viscosity is too high.
6. Solvent evaporation speed is too slow or printing machine speed is too fast.
7. Ink storage time is too long, layered precipitation.
8. Poor solubility of ink.

1. Replace or regrind the scraper (analyze the service time of the blade)
2. If the pressure is too high, the ink scraping effect will not work; if the pressure is too small, the scraping will not be clean, mainly in the non dot position. The appropriate pressure should be adjusted and the layout should be observed during operation.
3. Grinding plate roller or stripping.
4. Control eccentricity (runout range)
5. Reduce ink printing viscosity.
6. Improve the solvent evaporation speed, reduce the printing speed and blow to the printing plate.
7. Replace with new ink.
8. Contact the ink supplier for technical guidance.

problem

原因

countermeasure

4. Drying is too slow.
If the drying speed is too slow, it will lead to precipitation, so that the guide roller pollution, adhesion, ink too much into the paper, so that the paper curl or due to the increase of residual solvent content and odor.

1. The drying rate of diluted solvent is too slow.
2. The depth of the version is too deep.
3. The capacity of the dryer is insufficient.
4. The printing speed has increased too fast.
5. The viscosity of the ink is too high.

1. When the special solvent can not meet the requirements, the quick drying solvent should be used.
2. If you have to use a deeper plate depth, you should use fast drying solvent and slow down the printing speed.
3. The drying capacity mainly depends on the air volume (or wind speed), and the temperature is the second.
4. Printing speed should be determined by the dryer, but also depends on the level of residual solvent, including ink quality.
5. Adjust ink viscosity and check stability frequently.

5. Too fast drying.
The normal transfer of ink is destroyed, there are overprint and screen chip phenomenon, or for the bright part of the plate blocking, whitening reasons.

1. Ink and solvent drying too fast.
2. The hot air from the dryer blew to the layout.
3. Air circulation occurs near the printing plate.

1. Use slow drying solvent, but considering the amount of solvent in the original ink, the solvent can be partially adjusted, only 30-50%. Therefore, when it is difficult to solve the problem, contact the ink factory.
2. Make the air displacement of dryer greater than that of air intake, so as to prevent air leakage to the outside of the dryer. In case of air leakage, it should be considered to take cover measures.
3. Avoid direct wind from doors, windows and air conditioners to the panel

6. Bubbles.
A large amount of blistering occurs in printing, which makes the scraper function deteriorate, resulting in the pollution of printed matter due to the dot loss and foam splashing.

1. There is a lot of air in the ink tank.1. Check the pump mode, pump flow rate and overflow velocity, and slow down the overflow speed.
2. Improve the position of the ink storage tank, and use appropriate piping to make the bending part of the ink piping round.
3. Reduce ink viscosity and use defoamer.
4. Add new ink, and add appropriate amount of defoamer.
5. Use new ink.
6. Please provide guidance from the ink factory.

7. Albinism.
The screen on the printing surface seems to be sprinkled with powder, showing a piece of white, with poor adhesion, scratches and other phenomena.

1, when the ink is drying on the film surface, the mixed solvent is out of balance, resulting in insoluble, precipitated, turbid and partially gelatinization of the resin.
2, when the ink is drying on the surface of the film, because the humidity is large and the temperature drops, it is mixed into the water so that it is cloudy. The gel causes the resin to be insoluble, precipitated, white and partial gelatinization.