The following matters need to be noted when using ink defoamers:
1. Choose a suitable defoamer
Ink type: Different types of inks have different requirements for defoamers, so it is necessary to choose a
suitable defoamer according to the specific type of ink.
Environmental protection requirements: With the improvement of environmental awareness, it has become
a trend to choose environmentally friendly defoamers. Such defoamers can not only effectively eliminate foam,
but also reduce the impact on the environment.
Compatibility: When choosing a defoamer, pay attention to its compatibility with printing inks to ensure that the
defoamer can be evenly dispersed in the ink and will not cause other printing failures.
2. Determine the appropriate amount of addition
The amount of defoamer added should be tested and adjusted according to the properties of the ink, the conditions
of use, and the required defoaming effect.
Generally speaking, the amount of defoamer added is very small, usually only 0.02%~0.6% of the total mass of the ink.
Excessive use may cause adsorption of the defoamer and the medium, affecting the printing suitability of the ink.
3. Correct adding method
Adding order: First add the defoamer to the mixing container, then gradually add the ink, and stir and mix thoroughly
to ensure that the defoamer is evenly dispersed in the ink.
Adding speed: When adding the defoamer, the speed should be slow to avoid adding too much at one time, which will
affect the performance of the ink.
Adding time: It is best to add the defoamer during the production process of water-based ink, which is divided into two additions:
the grinding and dispersing pigment stage and the ink-forming stage of the pigment slurry with emulsion, and add half of
the total amount in each stage. It is best to use a defoamer with a large anti-foaming effect in the grinding and dispersing pigment
stage, and a defoamer with a large defoaming effect in the ink-forming stage.
4. Storage and preservation
During the storage process, the defoamer should avoid high temperature and humid environment to avoid affecting its
performance.
Avoid contact with chemicals such as acids and alkalis to avoid chemical reactions.
Store in a sealed container to prevent impurities such as moisture and dust from entering.
5. Observation and adjustment
After adding the defoamer, observe the changes in the ink at any time, such as the elimination of foam and the fluidity of the ink.
According to the printing effect and foam situation, adjust the amount of defoamer added or use other defoamers in time.
6. Follow the supplier's advice
According to the instructions for use of the selected defoamer and the supplier's advice, follow the correct usage and precautions.
In summary
There are many aspects to pay attention to during the use of ink defoamers, including selecting suitable defoamers, determining
the appropriate amount of addition, the correct addition method, storage and preservation, observation and adjustment, and
following the supplier's advice. Following these precautions will help ensure the printing quality and production efficiency of the ink.
