Drying and gas or vapor contact with solids – Process – Diverse types of drying operations
Patent
1997-05-22
1998-05-12
Bennett, Henry A.
Drying and gas or vapor contact with solids
Process
Diverse types of drying operations
34433, 134 10, F26B 700
Patent
active
057491593
ABSTRACT:
This invention pertains to a substrate cleaner and dryer or a dryer alone, and in particular, to an improved method of isopropyl alcohol (IPA) vapor drying having "closed loop" processing and capability to process extremely large substrates. The invention uses an inert gas, typically nitrogen (N.sub.2) or argon (Ar), as a process gas for carrying the vapor of a drying fluid in a "closed loop" cycle through a process vessel. The carrier gas and is pumped through a vapor generator and the process vessel in a rapid "closed loop" manner with extremely pure IPA vapor. Various embodiments employ the invention including two different vapor drying methods, a water rinse and vapor dry method and a solvent clean and vapor dry method. In either the water rinse and vapor dry method and a solvent clean and vapor dry method rinse water or cleaning fluid is rapidly drained in an unimpeded manner from the vessel while the process vessel is vented.
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Bennett Henry A.
Gravini Steve
Holland Joseph W.
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