... exterior polished in 300mesh (sanitary level).All the welding seams shall be polished after rubdown, and as to the treatment interface, ... and dispersion in the vacuum mixer. It will help to blend, mix, emulsify, and homogenize the product in the vessel, and increase the stability, smoothness ... system.3. With vacuum pump to take the air bubbles out of mixed product, and extend the time of storage.4. ...