Polyurethane ink defoamer to save the foam problem

NEWS & CASES

Polyurethane ink defoamer to save the foam problem
By : Zilibon Chemical

2025/2/10
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In the production process of polyurethane ink, the mixing and stirring of multiple components is an important factor in the generation of foam. Raw materials such as polyurethane resin, pigment, solvent, and additives are easily involved in air to form foam under high-speed stirring. In addition, during the printing and use of ink, the high-speed operation of the printing equipment, such as the transfer of ink between ink rollers and the transfer from the ink fountain to the printing plate, will also be mixed with air due to mechanical action, resulting in foam.

The foam will appear as uneven ink layer thickness on the printed product, and may have defects such as white spots and holes, which seriously affect the clarity and color saturation of the printed product. For some high-quality printing needs, such as exquisite album packaging, this effect cannot be ignored.

The molecules of polyurethane ink defoamer can also penetrate into the liquid film of the foam, interfere with the intermolecular forces inside the foam, and destroy the elastic structure of the foam. Under normal circumstances, the foam can resist external interference to a certain extent and remain stable due to its elasticity. When the defoamer destroys this elasticity, the foam is easy to break when it is affected by external factors such as slight vibration of the printing equipment or the flow of the ink itself.

Since the composition of polyurethane ink is relatively complex, the defoamer needs to have good compatibility with various components such as polyurethane resin, pigment, solvent, etc. If the compatibility is not good, the ink may be stratified, precipitated, and other phenomena may occur, affecting the performance of the ink. Good compatibility can ensure that the defoamer is evenly dispersed in the ink and exerts an ideal defoaming and anti-foaming effect.

Polyurethane ink defoamers play a vital role in the production and printing applications of polyurethane inks. As the printing industry continues to improve its requirements for printing quality, the performance requirements for its polyurethane ink defoamers will also continue to increase. It is believed that polyurethane ink defoamers will continue to promote the development of the printing industry.
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