Defoaming and Deaeration
Air (gas) dissolved in material appears as air bubbles when the material's temperature and/or pressure is changed. The removal of air bubbles occurring under certain conditions (temperature/pressure) is defined as "defoaming" at Thinky.
For instance, a large amount of oxygen is dissolved in water-based ink. Water-based ink's viscosity is extremely low, almost as low as water, and air bubbles contained in the material are not recognizable under atmospheric pressure. However, vacuum pressure reduction makes the dissolved oxygen in the ink recognizable. By mixing and defoaming under constant reduced pressure with Thinky's planetary centrifugal vacuum mixer, these air bubbles of dissolved oxygen can be removed efficiently.
The removal of air bubbles observed in material (liquid) under atmospheric pressure and room temperature is defined as "deaeration" at Thinky.
For instance, high-viscosity adhesives such as epoxy resin, a large amount of air bubbles are caught in the process of transferring resin from one container to another. In high-viscosity material, air bubbles are surrounded by firm fluid film and become recognizable with your eyes. The air bubbles left in the material make the appearance of the final product undesirable and may also impair the primary characteristics the material originally had. Therefore, it is necessary to remove the air bubbles contained in the material under atmospheric pressure and room temperature, whether they are recognizable with your eyes or through a microscope.
Depending on the size of the air bubbles to be removed, Thinky recommends using the different models of mixers listed below. Air bubbles recognizable with your eyes: ARE-310, centrifugal deaeration under atmospheric pressure Air bubbles recognizable through microscope: THINKY MIXER (vacuum type) ARV-310, deaeration under vacuum pressure reduction Caution) Accuracy of deaeration may vary depending on the material.
- Figure 4-1 ARE-310 Deaeration of air bubbles recognizable with your eyes
- Figure 4-2 ARV-310 Deaeration of air bubbles recognizable through a microscope
Benefits of THINKY MIXER (deaeration)
(1) Deaeration completed in a small amount of time
(2) High-viscosity material can be deaerated
(3) Air bubbles at the bottom of material that were difficult to remove with vacuum chamber systems can be removed
(4) Centrifugal force of revolution prevents material overflow
(5) Dissolved oxygen and gas can be defoamed