Difference between atmospheric-pressure type and vacuum type
March 29, 2023
ZYE's planetary centrifugal mixer consists of two types: atmospheric-pressure type and vacuum type. In the agitation process, bubbles often cause problems, and in such a case, one of these two types can be used depending on the purpose and usage. The atmospheric-pressure type mixer can remove air bubbles of several hundred microns order, which are visible to the naked eye.
The vacuum type mixer can be used when invisible micron-sized bubbles are to be removed. Conventionally, following agitation in a mixer, deaeration is accomplished with a desiccator, etc., which takes a long time. The planetary centrifugal mixer can achieve deaeration while agitating without worrying about overflowing, greatly reducing time.
Deaeration by atmospheric-pressure type (suitable for materials with relatively low viscosity)
Most of the atmospheric-pressure type mixers are equipped with the "deaeration mode". By changing the balance between revolution speed and rotation speed, deaeration takes place on the basis of the following principles:
(1) "Centrifugal force due to revolution" forces light bubbles to the liquid surface.
(2) By applying slow rotation that engulfs no bubbles (i.e., deaeration mode), bubbles that have risen to the liquid surface are destroyed by shearing force.