Closed-loop system and a method for separating materials of differing melting points

1. A closed loop system for separating materials of differing melting points comprising:

an ultrasonic bath including a solution configured to supply thermal energy and cavitation to said materials of differing melting points, wherein said thermal energy has a temperature between said differing melting points; and

a solution reservoir configured to adjust levels of said solution in said ultrasonic bath.

2. The closed loop system of claim 1 , further comprising a filter configured to remove particles from said solution.

3. The closed loop system of claim 1 , further comprising a skimmer configured to remove buoyant particles from said ultrasonic bath.

4. The closed loop system of claim 3 , wherein said skimmer comprises one of a belt, a disk, a drum, a mop, a tube, a floating suction, a columnar, a co-current, a counter current, or a venturi technology skimmer.

5. The closed loop system of claim 1 , wherein said ultrasonic bath comprises:

a hot solvent bath; and

an ultrasonic transducer.

6. The closed loop system of claim 5 , wherein said solvent comprises water.

7. The closed loop system of claim 1 , wherein said ultrasonic bath comprises:

a dry oven; and

a solvent bath including an ultrasonic transducer.

8. The closed loop system of claim 1 , wherein said materials are formed, respectively, into an solid free form fabrication object and support structure for said object, said ultrasonic bath being configured to remove said support structure from said object using said thermal energy and cavitation.

9. The closed loop system of claim 8 , further comprising a computing device configured to control removal of said support structure material from said object using said system.

10. The closed loop system of claim 9 , further comprising a conveyor belt or a robotic arm configured to manipulate said object while in said system.

11. The closed loop system of claim 10 , wherein said system comprises an automated system.

12. A production system comprising a closed loop system for removing support material from a fabricated article, wherein said system for removing support material receives said article after fabrication by a solid freeform fabrication system, said production system comprising:

a jetting head for selectively depositing two different materials, a build material for forming said article and a support material for supporting formation of said article, wherein said materials have different melting points; and

an ultrasonic bath configured to supply thermal energy and cavitation to said article to separate any remaining support material from said article, wherein said thermal energy has a temperature above a melting point of said support material but below a melting point of said build material.

13. The closed loop system of claim 2 , wherein said filter comprises one of an activated carbon, an oil absorber, or a sand filter.

14. The closed loop system of claim 1 , further comprising a UV radiation applicator configured to remove particles of said materials of differing melting points from said solution.

15. The system of claim 8 , wherein said ultrasonic bath comprises at least one ultrasonic transducer that operates at different frequencies, a first frequency being effective to remove at least some support structure material from said object and a second frequency being effective to remove smaller portions of support structure material from said object.

16. The system of claim 15 , wherein said ultrasonic transducer outputs ultrasonic energy at said first and second frequencies simultaneously.

17. The system of claim 15 , wherein said ultrasonic transducer alternately operates at said first and second frequencies.

18. The system of claim 1 , wherein said materials comprise a lens and support material used during formation of said lens.