Ltd. Plasma Plasma energy is generally not what one calls to mind when searching for a means to eradicate unwanted mold, bacteria, or insect infestation of wet library materials. Vacuum freeze drying has been used successfully to dry such materials but this process does not kill mold or bacteria. Midwest Freeze-Dry, Ltd. has pioneered the use of radio generated plasma energy to solve this problem.
Plasma energy is considered by many leading physicists to be the fourth state of matter.
It can also be described as a type of gaseous energy. The process of drying materials is greatly accelerated when this energy is utilized. Although it sounds extremely complicated, and from a technical standpoint it is, the generation of such energy can be described in relatively simple terms. This is accomplished by using a series of roughing and refining pumps. At this point the inside temperature of the chamber is well below the freezing point of water.